abstract class A{   
	abstract void m1( );
	public void m2( ){
		System.out.println("A類中定義的m2方法");
	}
}

class B extends A{
	void m1( ){
		System.out.println("B類中定義的m1方法");
	}
}

public class Test{
	public static void main( String args[ ] ){
		A c = new B( );
		c.m1( );
		c.m2( );
	}
}