adddemo.java

Java语言是目前最流行

class value1//原始类
{
	int x,y;
	value1(int a,int b)
	{
		x=a;
		y=b;	
	}	
};

class value2 extends value1//继承类
{
	value2(int a,int b)
	{
		super(a,b);	
	}	
};

class AddDemo1//引用类
{
	public static void main(String[] aa)	
	{
		int sum;
		value2 num = new value2(10,20);
		sum = num.x + num.y;
		System.out.println("add= "+sum);	
	}
}