Java List自定义排序 Java怎样实现List自定义排序
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实体类
package com.whty.entity; public class User { private int id; private String name; private int age; public User(int id, String name, int age) { super(); this.id = id; this.name = name; this.age = age; } public int getId() { return id; } public void setId(int id) { this.id = id; } 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; } @Override public String toString() { return "User [id=" + id + ", name=" + name + ", age=" + age + "]"; } }
测试类
package com.whty.test; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; import com.whty.entity.User; public class Test { public static void main(String[] args) { List<User> list = new ArrayList<>(); list.add(new User(1, "java", 20)); list.add(new User(2, "spark", 19)); list.add(new User(3, "hive", 21)); for(User user :list) { System.out.println("排序前:" + user.toString()); } //实现排序 Collections.sort(list, new Comparator<User>() { @Override public int compare(User u1, User u2) { if(u1.getAge() > u2.getAge()) { //return -1:即为正序排序 return -1; }else if (u1.getAge() == u2.getAge()) { return 0; }else { //return 1: 即为倒序排序 return 1; } } }); for(User user :list) { System.out.println("排序后:" + user.toString()); } } }
运行结果
排序前:User [id=1, name=java, age=20]
排序前:User [id=2, name=spark, age=19]
排序前:User [id=3, name=hive, age=21]
排序后:User [id=3, name=hive, age=21]
排序后:User [id=1, name=java, age=20]
排序后:User [id=2, name=spark, age=19]
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