package inheritance; public class ClassB extends ClassA { int a = 1; public ClassB() { } public ClassB(int a) { super(); //기본 생성자 생략 가능 System.out.println("ClassB 생성자 a="+a); } public ClassB(int a, int b) { super(); //기본 생성자 생략 가능 System.out.println("ClassB 생성자 a="+a + " b=" + b); } @Override public void poly() { System.out.println("Class B"); } public void notInA() { System.out.println("Doesn't work if not ClassB"); } }