Java List获取集合中的最大值或最小值

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1.List集合中的元素为基本类型，我们可以使用java.util中的Collections提供的方法，来取出最大值或者最小值。
（1）Integer类型

package com.yuxuange.study.test;

import java.util.*;

public class Test {

<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Integer</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">99</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">54</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">82</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">12</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">33</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">79</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">90</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">7</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">66</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">38</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">7</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>list<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Integer</span> max <span class="token operator">=</span> <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中最大值为："</span> <span class="token operator">+</span> max<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Integer</span> min <span class="token operator">=</span> <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中最小值为："</span> <span class="token operator">+</span> min<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}

输出的结果为：
![整型输出结果]
（2）Double类型

package com.yuxuange.study.test;

import java.util.*;

public class Test {

<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Double</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">97.42</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">83.555</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">99.8045</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">45.33</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">8.2006</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">54.333</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">72.9055</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">56.999997</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">20.9</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">6.099912</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>list<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Double</span> max <span class="token operator">=</span> <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中最大值为："</span> <span class="token operator">+</span> max<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Double</span> min <span class="token operator">=</span> <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中最小值为："</span> <span class="token operator">+</span> min<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}

输出结果为：
![Double类型输出结果]
2.List集合中的元素为引用类型时
（1）String类型

package com.yuxuange.study.test;

import java.util.*;

public class Test {

<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"97.435"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"92"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"80.3455"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"10.9833"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"52"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"35.663444"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"79.0"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"42"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"83.482"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token string">"26.454448"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>list<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">String</span> max <span class="token operator">=</span> <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中最大值为："</span> <span class="token operator">+</span> max<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">String</span> min <span class="token operator">=</span> <span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>list<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中最小值为："</span> <span class="token operator">+</span> min<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}

![String类型输出结果]

（2）对象，比如有个对象集合，集合中保存了学生的对象信息，我们要根据学号，年龄等字段找出对应的最大值或者最小值

package com.yuxuange.study.test;

import java.util.*;

public class Test {

<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Student</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> zhangsan <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">99</span><span class="token punctuation">,</span> <span class="token string">"张三"</span><span class="token punctuation">,</span> <span class="token number">28</span><span class="token punctuation">,</span> <span class="token number">96.0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> lisi <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">82</span><span class="token punctuation">,</span> <span class="token string">"李四"</span><span class="token punctuation">,</span> <span class="token number">25</span><span class="token punctuation">,</span> <span class="token number">89.0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> wangwu <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">26</span><span class="token punctuation">,</span> <span class="token string">"王五"</span><span class="token punctuation">,</span> <span class="token number">23</span><span class="token punctuation">,</span> <span class="token number">72.5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> zhaoliu <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">68</span><span class="token punctuation">,</span> <span class="token string">"赵六"</span><span class="token punctuation">,</span> <span class="token number">30</span><span class="token punctuation">,</span> <span class="token number">65.5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> tianqi <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">8</span><span class="token punctuation">,</span> <span class="token string">"田七"</span><span class="token punctuation">,</span> <span class="token number">26</span><span class="token punctuation">,</span> <span class="token number">100.0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> fengba <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">47</span><span class="token punctuation">,</span> <span class="token string">"冯八"</span><span class="token punctuation">,</span> <span class="token number">21</span><span class="token punctuation">,</span> <span class="token number">52.5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> jinjiu <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token number">14</span><span class="token punctuation">,</span> <span class="token string">"金九"</span><span class="token punctuation">,</span> <span class="token number">27</span><span class="token punctuation">,</span> <span class="token number">46.5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>zhangsan<span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>lisi<span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>wangwu<span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>zhaoliu<span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>tianqi<span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>fengba<span class="token punctuation">)</span><span class="token punctuation">;</span>
    list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>jinjiu<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>list<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> noMax <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token class-name">Comparator</span><span class="token punctuation">.</span><span class="token function">comparing</span><span class="token punctuation">(</span><span class="token class-name">Student</span><span class="token operator">::</span><span class="token function">getNo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> noMin <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span><span class="token class-name">Comparator</span><span class="token punctuation">.</span><span class="token function">comparing</span><span class="token punctuation">(</span><span class="token class-name">Student</span><span class="token operator">::</span><span class="token function">getNo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中学号最大的学生信息为"</span> <span class="token operator">+</span> noMax<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中学号最小的学生信息为"</span> <span class="token operator">+</span> noMin<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> ageMax <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token class-name">Comparator</span><span class="token punctuation">.</span><span class="token function">comparing</span><span class="token punctuation">(</span><span class="token class-name">Student</span><span class="token operator">::</span><span class="token function">getAge</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">Student</span> ageMin <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span><span class="token class-name">Comparator</span><span class="token punctuation">.</span><span class="token function">comparing</span><span class="token punctuation">(</span><span class="token class-name">Student</span><span class="token operator">::</span><span class="token function">getAge</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中年龄最大的学生信息为"</span> <span class="token operator">+</span> ageMax<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"集合中年龄最小的学生信息为"</span> <span class="token operator">+</span> ageMin<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}

class Student {

<span class="token keyword">private</span> <span class="token class-name">Integer</span> no<span class="token punctuation">;</span>

<span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span>

<span class="token keyword">private</span> <span class="token class-name">Integer</span> age<span class="token punctuation">;</span>

<span class="token keyword">private</span> <span class="token class-name">Double</span> score<span class="token punctuation">;</span>

<span class="token keyword">public</span> <span class="token class-name">Student</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> no<span class="token punctuation">,</span> <span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token class-name">Integer</span> age<span class="token punctuation">,</span> <span class="token class-name">Double</span> score<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>no <span class="token operator">=</span> no<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>score <span class="token operator">=</span> score<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token class-name">Integer</span> <span class="token function">getNo</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">return</span> no<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setNo</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> no<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>no <span class="token operator">=</span> no<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">return</span> name<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setName</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>name <span class="token operator">=</span> name<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token class-name">Integer</span> <span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">return</span> age<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setAge</span><span class="token punctuation">(</span><span class="token class-name">Integer</span> age<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>age <span class="token operator">=</span> age<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token class-name">Double</span> <span class="token function">getScore</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">return</span> score<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setScore</span><span class="token punctuation">(</span><span class="token class-name">Double</span> score<span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>score <span class="token operator">=</span> score<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
    <span class="token keyword">return</span> <span class="token string">"Student{"</span> <span class="token operator">+</span>
            <span class="token string">"no="</span> <span class="token operator">+</span> no <span class="token operator">+</span>
            <span class="token string">", name='"</span> <span class="token operator">+</span> name <span class="token operator">+</span> <span class="token string">'\''</span> <span class="token operator">+</span>
            <span class="token string">", age="</span> <span class="token operator">+</span> age <span class="token operator">+</span>
            <span class="token string">", score="</span> <span class="token operator">+</span> score <span class="token operator">+</span>
            <span class="token string">'}'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

}

输出结果为：
![对象类型输出结果]!