类的继承 方法和属性的重写

package expression;

public class Computer {
	String c = new String("Computer"); 
	void showPicture(){
		System.out.println("台式电脑：鼠标点击打开图片");
	}
	
}

package expression;

public class Pad extends Computer{
	String c = new String("Pad");
	
	void showPicture(){
		System.out.println("平板电脑：点击打开图片");
	}
}

package expression;

public class Text {
	public static void main(String[] args){
		Computer c = new Computer();
		Pad p = new Pad();
		
		System.out.println(c.c);
		System.out.println(p.c);
		
		
		c.showPicture();
		p.showPicture();
	}
}