在java中，手写实现一个数字的首位交换算法实现

实现效果

实现代码

• 核心业务代码

public static void main(String[] args) {
    int[] arr = {1,2,3,4,5};
    int temp = arr[0];
    for (int i = 0; i < arr.length; i++) {
        System.out.print(arr[i]);
    }
    System.out.println("");

    for (int i = 0,j = arr.length-1; i < j; i++,j--) {
        temp = arr[i];
        arr[i] = arr[j];
        arr[j] = temp;
    }
    for (int i = 0; i < arr.length; i++) {
        System.out.print(arr[i]);
    }
}

• 随机打乱数组

public static void main(String[] args) {
    // 打乱数组的顺序
    int[] arr = {1,2,3,4,5};
    // 获取随机索引
    Random random = new Random();


    for (int i = 0; i < arr.length; i++) {
        int index = random.nextInt(arr.length);
        int temp = arr[i];
        arr[i] = arr[index];
        arr[index] = temp;
    }
    for (int i = 0; i < arr.length; i++) {
        System.out.print(arr[i]);
    }
}