Java Unit 21: Class - Interface - Abstract class

package edu.java.basic

public class Unit21{
    private String name ;
    public void show(){
    }
}

interface Human{
    public final static String COUNTRY_NAME = " Viet Nam ";

    public void show ();
}

abstract class Employee{
    private String name;

    public void move1(){
    }

    public abstract move2();
}