/*Main方法由Java虛擬機調(diào)用
 *不用產(chǎn)生對象來調(diào)用，故是static*/

/*函數(shù)調(diào)用。。。。*/
/*
 *在Java中，傳參時，都是以傳值的方式進行。
 *
 *對于基本數(shù)據(jù)類型，傳遞的是數(shù)據(jù)的拷貝
 *對于引用類型，傳遞的引用的拷貝
 *
 */
/*
 *看是數(shù)據(jù)作為形參還是引用作為形參
 *
 */
class MainTest
{
	public static void change(int x,int y)
	{
		x=x+y;
		y=x-y;
		x=x-y;
	}
	public static void change(int[] num)
	{
		num[0] = num[0]+num[1];
		num[1] = num[0]-num[1];
		num[0] = num[0]-num[1];
	}
	public 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)
	{
		/*
		if(args.length>0)
		{
			for(int i=0; i<args.length;i++)
			{
				System.out.println(args[i]);
			}
		}*/
		int x=3;
		int y=4;
		change(x,y);
		System.out.println("x="+x+","+"y="+y);
		
		int[] num=new int[]{3,4};
		change(num);
		System.out.println("x="+num[0]+","+"y="+num[1]);
		
		
		Point pt = new Point();
		pt.x = 3;
		pt.y = 4;
		change(pt);
		System.out.println("x="+pt.x+","+"y="+pt.y);
		System.out.println(pt);
		/*見toString()方法*/
		/*The to String method for class Object returns a string consisting
		 *of the name of the class of which the object is an instance,the at-sign
		 *character '@',and the unsigned hexadecimal representation of the hash code
		 *of the object.In other words,this method returns a string equal to the value of:
		 *
		 *getClass().getName() + '@'+ Integer.toHexString(hashCode())
		 *
		 *It is recommended that all subclasses override this method;
		 **/
	}
}

class Point
{
	int x,y;
	public String toString()
	{
		return "x="+x+":"+"y="+y;	
	}
	
}