Java关键字 extends继承

package expression;

public class Computer {
	String Com = "液晶显示屏";
	void Starup() {//方法
		System.out.println("正在开机，请稍等...");
	}
}

package expression;

public class Pad extends Computer{
	String c = "打开3G网络";
	void Button(){
		System.out.println("5000毫安");
	}
}

package expression;

public class Text {
	public static void main(String[] args){
		Computer c = new Computer();
		Pad p = new Pad();
		
		System.out.println(c.Com);
		c.Starup();
		
		System.out.println(p.Com);//子类继承父类属性
		p.Starup();
		
		System.out.println(p.c);//子类独有属性
		p.Button();
	}
}