CODE

 

package TestMethod;

public interface A {

void a1();

void a2();

void a3();

void a4();

void a5();

void a6();

}

abstract class AbstractA{

publicabstractvoid a1();

publicabstractvoid a2();

publicabstractvoid a3();

publicabstractvoid a4();

publicabstractvoid a5();

publicabstractvoid a6();

}

abstract class ConcreteAextends AbstractA{

publicvoid a1(){

System.out.println("a1() is printed!");

}

publicvoid a2(){}

publicvoid a3(){}

publicvoid a4(){}

publicvoid a5(){}

publicvoid a6(){}

}