How to use Java comparator properly?

Question

If I have the following class:

public class Employee {
    private int empId;
    private String name;
    private int age;

    public Employee(int empId, S         


        

Answer 1

You can also implement the Comparable Interface in your class.

for example, something like this:

public class Employee implements Comparable{
    private int empId;
    private String name;
    private int age;

    public Employee(int empId, String name, int age) {
            // set values on attributes

    }
    // getters & setters

    public int compareTo(Employee o) {
        int ret = this.name.compareTo(o.name);
        if(ret == 0)
            ret = this.age - o.age;
        if(ret == 0)
            ret = this.empId - o.empId;

        return ret;
    }
}

so you don't have to implement a extra class to compare your Employees.