parametertest.java

孙鑫JAVA从入门到精通配套练习程序。所有程序都实际运行过

//测试基本和引用类型的传参方式
class ParameterTest
{
	//交换两个数
	static void change(int x, int y)
	{
		x = x + y;
		y = x - y;
		x = x - x;
	}
	static void change(int[] num)
	{
		num[0] = num[0] + num[1];
		num[1] = num[0] - num[1];
		num[0] = num[0] - num[1];
	}
	static void change(Point pt)
	{
		pt.x = pt.x + pt.y;
		pt.y = pt.x - pt.y;
		pt.x = pt.x - pt.y;
	}
	public static void main(String[] args)
	{
	/*
		int x = 3;
		int y = 4;
		change(x, y);
		System.out.println(x + "," + y);
	
		int[] num = new int[]{3, 4};
		change(num);
		System.out.println(num[0] + "," + num[1]);
		*/
		Point pt = new Point();
		pt.x = 3;
		pt.y = 4;
		change(pt);
		System.out.println(pt.x + "," + pt.y);
	}
}


class Point
{
	int x;
	int y;
	
}