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]);}
}