No2_4.接口继承多态_Java学习笔记_经典案例

 1 import java.util.ArrayList;
 2 import java.util.Collections;
 3 import java.util.List;
 4 
 5 /**
 6  * @title 接口继承多态的经典范例
 7  * @author 作者：sunshine yaqingl
 8  * @date 创建时间：2016年7月6日 下午5:27:39
 9  */
10 
11 //使用Comparable接口自定义排序 
12 class Employee implements Comparable<Employee>{
13     private int id;
14     private String name;
15     private int age;
16     public Employee(int id,String name,int age){
17         this.id=id;
18         this.age=age;
19         this.name=name;        
20     }
21     @Override
22     public int compareTo(Employee o){
23         if(age>o.age){
24             return 1;
25         }else if(age<o.age){
26         return -1;
27         }
28         return 0;
29     }
30     @Override 
31     public String toString(){
32         StringBuilder sb=new StringBuilder();
33         sb.append("员工的编号："+id+"，");
34         sb.append("员工的姓名"+ name+"，");
35         sb.append("员工的年龄："+age);
36         return sb.toString();
37     }
38     
39 }
40 
41 public class Hello4IEPExample {
42 
43     public static void main(String[] args) {
44         // TODO Auto-generated method stub
45         /**************使用Comparable接口自定义比较**************/
46         //使用Comparable接口自定义比较
47         Employee employee=new Employee(1,"sunshine",28);
48         Employee employee1=new Employee(2,"habit",26);
49         Employee employee2=new Employee(3,"Liuliu",30);
50         String mm;
51         if (employee.compareTo(employee2) ==1){
52              mm=employee.toString();
53         }
54         else{
55              mm=employee2.toString();    
56         }
57         
58         System.out.println(mm);
59         //使用Comparable接口自定义排序
60         List<Employee> list=new ArrayList<Employee>();    //之后了解相关功能
61         list.add(employee);
62         list.add(employee1);
63         list.add(employee2);
64         System.out.println("排序前：");
65         for(Employee e : list){
66             System.out.println(e);            
67         }
68         
69         System.out.println("排序前：");
70         Collections.sort(list);
71         for(Employee e : list){
72             System.out.println(e);            
73         }
74         
75 
76     }
77 
78 }