java简单的接口程序

import java.util.Arrays;

public class Grapeh {
public static void main(String[] args) {
Employee[] staff=new Employee[3];
staff[0]=new Employee("heln",5003);
staff[1]=new Employee("mell",1000);
staff[2]=new Employee("kell",500);
Arrays.sort(staff);
for(Employee e:staff)
System.out.println("name="+e.getName()+",salary="+e.getSalary());
}
}

public class Employee implements Comparable<Employee>{
private String name;
private double salary;
public Employee(String n ,double s){
name=n;
salary=s;
}
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){
return Double.compare(salary, other.salary);
}

}