public class Employee implements Comparable<Employee>{

  //成员变量

  private String EmployeeID;

  private String Name;

  private float Salely;

  public Employee() {

super();

}

  //构造方法

  public Employee(String employeeID, String name, float salely) {

super();

EmployeeID = employeeID;

Name = name;

Salely = salely;

}

  //getter和setter方法

  public String getEmployeeID() {

return EmployeeID;

}

public void setEmployeeID(String employeeID) {

EmployeeID = employeeID;

}

public String getName() {

return Name;

}

public void setName(String name) {

Name = name;

}

public float getSalely() {

return Salely;

}

public void setSalely(float salely) {

Salely = salely;

}

  //toString()方法

@Override

public String toString() {

return "员工 [编号：" + EmployeeID + ", 姓名：" + Name + ", 工资：" + Salely + "]";

}

@Override

public int compareTo(Employee o) {

float salely1=this.getSalely();

float salely2=o.getSalely();

return new Float(salely2-salely1).intValue();

}

}

public class EmployeeTest{

    public static void main(String[] args){

        //定义Employee类的对象

        Employee employee1=new Employee("emp001","张三",1800);

        Employee employee2=new Employee("emp002","李四",2500);

        Employee employee3=new Employee("emp003","王五",1600);

        //将对象添加到List中

        List <Employee> employeeList=new ArrayList<Employee>();

        employeeList.add(employee1);

        employeeList.add(employee2);

        employeeList.add(employee3);

        //输出排序前的数据

        System.out.println("排序前数据：");

        for(Employee ee:employeeList) {

        System.out.println(ee);

        }

        //排序

        Collections.sort(employeeList);

        //输出排序后的数据

        System.out.println("排序后数据：");

        for(Employee ee:employeeList) {

        System.out.println(ee);

        }

    }

}