CODE

 

package TestMethod;

public interface A {

void a1();

void a2();

void a3();

void a4();

void a5();

void a6();

}

abstract class AbstractA{

public abstract void a1();

public abstract void a2();

public abstract void a3();

public abstract void a4();

public abstract void a5();

public abstract void a6();

}

abstract class ConcreteA extends AbstractA{

public void a1(){

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

}

public void a2(){}

public void a3(){}

public void a4(){}

public void a5(){}

public void a6(){}

}