如何基于Java实现对象List排序

如何基于Java实现对象List排序

这篇文章主要介绍了如何基于java实现对象List排序,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

按照对象中的某个属性，对对象List进行排序。

以初唐四杰的成绩排名为例，对诗人进行排序。

Java实现如下：

1、诗人（Poet）类结构，定义如下：

/**

* Created by Miracle Luna on 2020/1/11

*/

public class Poet {

private String name;

private Double score;

public Poet(String name, Double score) {

this.name = name;

this.score = score;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Double getScore() {

return score;

}

public void setScore(Double score) {

this.score = score;

}

@Override

public String toString() {

return "Poet{" +

"name='" + name + '\'' +

", score=" + score +

'}';

}

}

2、诗人按照成绩排名，代码如下：

import java.util.ArrayList;

import java.util.Comparator;

import java.util.List;

/**

* Created by Miracle Luna on 2020/1/11

*/

public class PoetSort {

public static void main(String[] args) {

List poetList = new ArrayList();

Poet phttp://oet1 = new Poet("杨炯", 94.0);

poetList.add(poet1);

Poet poet2 = new Poet("卢照邻", 92.5);

poetList.add(poet2);

Poet poet3 = new Poet("骆宾王", 95.0);

poetList.add(poet3);

Poet poet4 = new Poet("王勃", 99.5);

poetList.add(poet4);

// 初始顺序

System.out.println("==> 初始顺序如下：");

poetList.forEach(poet -> System.out.println(poet.toString()));

// 按照分数排名(从高到低)

poetList.sort(new Comparator() {

@Override

public int compare(Poet poet1, Poet poet2) {

Double score1 = poet1.getScore();

Double score2 = poet2.getScore();

return score2.compareTo(score1);

}

});

System.out.println("\n==> 按照分数排名(从高到低)如下：");

poetList.forEach(poet -> System.out.println(poet.toString()));

// 按照分数排名(从低到高)

poetList.sort(new Comparator() {

@Override

public int compare(Poet poet1, Poet poet2) {

Double score1 = poet1.getScore();

Double score2 = poet2.getScore();

return score1.compareTo(score2);

}

});

System.out.println("\n==> 按照分数排名(从低到高)如下：");

poetList.forEach(poet -> System.out.println(poet.toString()));

}

}

3、运行结果如下：

==> 初始顺序如下：

Poet{name='杨炯', score=94.0}

Poet{name='卢照邻', score=92.5}

Poet{name='骆宾王', score=95.0}

Poet{name='王勃', score=99.5}

==> 按照分数排名(从高到低)如下：

Poet{name='王勃', score=99.5}

Poet{name='骆宾王', score=95.0}

Poet{name='杨炯', score=94.0}

Poet{name='卢照邻', score=92.5}

==> 按照分数排名(从低到高)如下：

Poet{name='卢照邻', score=92.5}

Poet{name='杨炯', score=94.0}

Poet{name='骆宾王', score=95.0}

Poet{name='王勃', score=99.5}

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