/*Comparator是java.util包里的一个接口，使用时应该实现导入相应的包，

*再写一个实现了Comparator接口的类，并复写int compare(Object o)方法，

*写出你的判断语句(例如：以下代码是按照年龄的递增顺序排序，年龄相同则按照工资的数目递增排序)

*把这个类添加到Arrays.sort()或Collections.sort()中(例如：定义一个list集合，用来存放对象，可以这样写:Collections.sort(list,new 实现类()；))

*/

package test;

import java.util.*;

public class ComparaUser {

private String name;

private int age;

private double salary;

public ComparaUser(){}

public ComparaUser(String name, int age ,Double salary){

this.name = name;

this.age = age;

this.salary = salary;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public double getSalary() {

return salary;

}

public void setSalary(double salary) {

this.salary = salary;

}

@SuppressWarnings("unchecked")

public static void main(String[] args) {

/*定义一个list集合，存放ComparaUser类型，

使用Array的静态方法asList(T....a)进行添加*/

List list = new ArrayList(Arrays.asList(

new ComparaUser("张三",24,200.0),

new ComparaUser("李四",28,233.1),

new ComparaUser("王二",25,500.3),new ComparaUser("麻五",24,300.5)));

Collections.sort(list,new Comp());

for(ComparaUser user :list){

System.out.println(user.getName()+" "+user.getAge()+" "+user.getSalary());

}

}

}

class Comp implements Comparator{

//复写Comparator的compara接口

@Override

public int compare(Object o1,Object o2){

ComparaUser user1 = (ComparaUser)o1;/*类型转换，转换成我们所比较的对象*/

ComparaUser user2 = (ComparaUser)o2;

/*按年龄排序，如果第一个user1的年龄大于user2的年龄，则返回 1 (按照升序排列)

小于返回 -1 降序排列 ； 如果相等，则按照工资再比较(参考年龄的比较方式)

*/

if(user1.getAge() > user2.getAge())

return 1;

else if(user1.getAge() < user2.getAge())

return -1;

else {

if(user1.getSalary() > user2.getSalary())

return 1;

else

return -1;

}

}

}