标签：排序 alibaba tag turn string pen spl pac opened
1.简单的集合排序
1 package com.demo.advice; 2 3 import java.util.Collections; 4 import java.util.LinkedList; 5 6 import com.alibaba.druid.sql.visitor.functions.Reverse; 7 8 public class Test { 9 public static void main(String[] args) { 10 11 LinkedList<Integer> list = new LinkedList<Integer>(); 12 list.add(1); 13 list.add(8); 14 list.add(7); 15 list.add(4); 16 list.add(5); 17 //排序前 18 System.out.println(list); 19 //倒序 20 Collections.reverse(list); 21 System.out.println(list); 22 //从大到小排序 23 Collections.sort(list); 24 System.out.println(list); 25 26 } 27 28 }
排序结果图
2.复杂一点的集合排序
1 package com.demo.advice; 2 3 4 import java.util.Collections; 5 import java.util.LinkedList; 6 7 8 9 public class Test { 10 public static void main(String[] args) { 11 LinkedList<Users> list = new LinkedList<Users>(); 12 list.add(new Users(1,"aa",20)); 13 list.add(new Users(4,"bb",30)); 14 list.add(new Users(3,"cc",25)); 15 list.add(new Users(3,"dd",42)); 16 list.add(new Users(8,"ee",35)); 17 Collections.sort(list); 18 for (Users users : list) { 19 System.out.println(users); 20 } 21 } 22 23 }
下面是实体类实现comparable接口
1 package com.demo.advice; 2 3 public class Users implements Comparable<Users> { 4 5 private int id; 6 private String name; 7 private int age; 8 public Users() { 9 super(); 10 // TODO Auto-generated constructor stub 11 } 12 public Users(Integer id, String name, Integer age) { 13 super(); 14 this.id = id; 15 this.name = name; 16 this.age = age; 17 } 18 @Override 19 public String toString() { 20 return "Users [id=" + id + ", name=" + name + ", age=" + age + "]"; 21 } 22 23 24 public int getId() { 25 return id; 26 } 27 public void setId(int id) { 28 this.id = id; 29 } 30 public String getName() { 31 return name; 32 } 33 public void setName(String name) { 34 this.name = name; 35 } 36 public int getAge() { 37 return age; 38 } 39 public void setAge(int age) { 40 this.age = age; 41 } 42 @Override 43 public int compareTo(Users o) { 44 int i = this.getId() - o.getId(); 45 if (i==0) { 46 return this.getAge() - o.getAge(); 47 } 48 return i; 49 // TODO Auto-generated method stub 50 51 } 52 }
标签：排序 alibaba tag turn string pen spl pac opened
原文地址：https://www.cnblogs.com/xaoco/p/9133377.html
