第三章动手动脑1

package test7;

 

class A extends B//子类

{

private int a;

public void a()

{

System.out.println(a);

}

}

class B //父类

{

private int b;

public void b()

{

System.out.println(b);

}

public boolean b1() //继承的方法

{return true;}

}

public class TestExtends

{

@SuppressWarnings({ "rawtypes", "unchecked" })

public static void main(String[] args)

{

Class A=A.class;

Class B=B.class;

System.out.println(B.isAssignableFrom(A));

if(B.isAssignableFrom(A))

{ System.out.println("B是A的父类"); }

else{ System.out.println("B不是A的父类"); }

}

}