19.User defined packages

package p;
public class AB
{
    public void display()
    {
        System.out.println("This is class AB");
    }
}
package p;
public class CD
{
    public void display()
    {
        System.out.println("This is class CD");
    }
}
import p.*;
class ABCD
{
    public static void main(String args[])
    {
        AB a1 = new AB();
        a1.display();
        CD a2 = new CD();
        a2.display();
    }
}