“Index 3 out of bounds for length 3” 求解决

可不可以帮忙看一下，为什么我照着写的结果会是这样，感谢！
public static void main(String[] args) {
System.out.println("请您输入需要加密的数字的个数：");
Scanner scanner = new Scanner(System.in);
int length=scanner.nextInt();
int[] arr= new int[length];
for (int i = 0; i < arr.length; i++) {
System.out.println("请您输入加密的第"+(i+1)+"个数字：");
int number = scanner.nextInt();
arr[i] = number;
}
printArry(arr);
for (int i = 0; i < arr.length; i++) {
arr[i]=(arr[i]+5)%10;
}
for (int i = 0,j = arr.length; i
int temp=arr[j];
arr[j]=arr[i];
arr[i]= temp;
}
printArry(arr);
}
public static void printArry(int[] arr) {//打印方法
System.out.print("[");
for (int i = 0; i < arr.length; i++) {
System.out.print(i==arr.length-1?arr[i]:arr[i]+", ");
}
System.out.println("]");
}

数组元素数量为3，那么最大下标值是2，你用3作为下标就越界了
for (int i = 0,j = arr.length; i <j; i++,j--) {
改为
for (int i = 0,j = arr.length-1; i <j; i++,j--) {