小编sup*_*h v的帖子

在Comparable Interface中使用==运算符

Employee.java

class Employee implements Comparable
{
    int id; String name; int age;

    Employee(int id,String name,int age)
    {
        this.id=id;
        this.name=name;
        this.age=age;
    }

    public int compareTo(Object obj)
    {
        Employee emp = (Employee)obj;
        if(age==emp.age)
        {
            return 0;
        }
        //else if(age>emp.age)
        //return 1;
        else
            return -1;
    }
}

display_logic.java

import java.util.*;
class display_logic
{
  public static void main(String args[])
  {
     ArrayList al = new ArrayList();
     al.add(new Employee(1,"Supreeth",21));
     al.add(new Employee(2,"Vijay",31));
     al.add(new Employee(3,"Ganesh",21));
     al.add(new Employee(4,"Aisu",31));
     al.add(new Employee(5,"Aizzz",41));
     Collections.sort(al);
     Iterator it = al.iterator();
     while(it.hasNext())
     { …