demo1.txt

package chapter7;

//通过位运算来交换两个数字
public class demo1 {

	public static void main(String[] args) {
		int[] arr = {1,2,3,4,5,6};
		change1(arr,0,1);
		change2(arr,2,3);
		change3(arr,4,5);
		for(int i=0;i<arr.length;i++){
			System.out.print(arr[i]+" ");
		}
	}
	//最普通的交换
	private static void change1(int[] arr,int i,int j){
		int temp = arr[i];
		arr[i] = arr[j];
		arr[j] = temp;
	}
	//第二种方法
    private static void change2(int[] arr,int i,int j){
		 arr[i] = arr[i] + arr[j];
		 arr[j] = arr[i] - arr[j];
		 arr[i] = arr[i] - arr[j];
	}
    //第三种方法，位交换
    private static void change3(int[] arr,int i,int j){
		arr[i] = arr[i]^arr[j];
		arr[j] = arr[i]^arr[j];
		arr[i] = arr[i]^arr[j];
	}

}