ArrayDemo3

package java基础知识.数组和常用算法;

/*
传递参数时：


*/
class ArrayDemo3 
{
	public static void main(String[] args) 
	{
		int a=10,b=20;
		System.out.println("a="+a+",b="+b);
		changeValue(a,b);
		System.out.println("a="+a+",b="+b);

		int[] arr = new int[]{1,2,3,4,5};
		System.out.println("数组改变前");
		printArray(arr);
		changeValue(arr);
		System.out.println("数组改变后");
		printArray(arr);
	}

	public static void changeValue(int a,int b)
	{
		System.out.println("a="+a+",b="+b);
		int temp = a;
		a = b;
		b = temp;
		System.out.println("a="+a+",b="+b);
	}


	public static void printArray(int[] arr)
	{
		System.out.print("[");
		for(int x=0; x<arr.length; x++)
		{
			if(x!=arr.length-1)
			{
				System.out.print(arr[x]+",");
			}
			else 
			{
				System.out.print(arr[x]);
			}
		}
		System.out.println("]");
	}

	public static void changeValue(int[] arr)
	{
		for(int x=0; x<arr.length; x++)
		{
			if(x%2==0)
			{
				arr[x]*=2;
			}
		}
	}
}