关于实现Comparable接口的一个小程序

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import java.util.*;
public class EmployeeSortTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Employee[] staff = new Employee[3];
staff[0] = new Employee("harry Hacker",35000);
staff[1] = new Employee("carl cracke",75000);
staff[2] = new Employee("tony Tester",38000);
Arrays.sort(staff);//sort方法可以实现对对象数组排序，但是必须实现 Comparable接口
/*Comparable接口原型为：
* public interface Comparable<T>
* {
* int compareTo（T other);//接口的中方法自动属于public方法
* }
*/
for(Employee e: staff)
System.out.println("id="+e.getId()+" name="+e.getName()+
".salary="+e.getSalary());
}
}
/*
* 因为要实现对Employee对象的排序，所以在Employee类中要实现Comparable接口，
* 也就是要实现comepareTo()方法
*/
class Employee implements Comparable<Employee>
{
public Employee(String n,double s)
{
name = n;
salary = s;
Random ID = new Random();
id = ID.nextInt(10000000);
}
public int getId()
{
return id;
}
public String getName()
{
return name;
}
public double getSalary()
{
return salary;
}
public void raiseSalary(double byPercent)
{
double raise = salary *byPercent/100;
salary+=raise;
}
public int compareTo(Employee other)
{
if(id<other.id)//这里比较的是什么 sort方法实现的就是按照此比较的东西从小到大排列
return -1;
if(id>other.id)
return 1;
return 0;
}
private int id;
private String name;
private double salary;
}

转至：http://sevven.javaeye.com/blog/173907