How to change arrs array? Of course you need to use a for loop

Taking MySQL's InnoDB as an example, the default Tansaction isolation level is REPEATABLE READ, and the read lock in SELECT

Code routine:

/**
 * 数据加密传输
 */
import java.util.Scanner;
public class secretPass {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int num = 0;
        while (true) {
            System.out.println("请输入四位正整数：");
            num = input.nextInt();
            if (num > 999 && num < 10000) {
                System.out.println("输入数据有效！");
                break;
            } else {
                System.out.println("输入数据无效，请重新输入！");
            }
        }
        System.out.println("加密前的数据是：" + num);
        int[] arrs = new int[4];
        arrs[0] = num % 10; // 取个位
        arrs[1] = num / 10 % 10; // 取十位
        arrs[2] = num / 100 % 10; // 取百位
        arrs[3] = num / 1000; // 取千位
        // 不能使用for-each语句改变arrs数组的元素
        // for-each只能用来遍历打印数组元素
        
        for (int n : arrs) { 
            n = (n + 5) % 10; 
            System.out.print(n+" "); 
        }
        
        /*
        for (int i = 0; i < arrs.length; i++) {
            arrs[i] = (arrs[i] + 5) % 10;
        }
        */
        /*
        for (int i = 0; i < arrs.length; i++) {
            System.out.print(arrs[i] + " ");
        }
        */
        int tmp1 = arrs[0];
        int tmp2 = arrs[1];
        int tmp3 = arrs[2];
        int tmp4 = arrs[3];
        arrs[0] = tmp4;
        arrs[1] = tmp3;
        arrs[2] = tmp2;
        arrs[3] = tmp1;
        System.out.print("加密后的数据是：");
        for (int i : arrs) {
            System.out.print(i);
        }
    }
}

The output result is:

Please enter a four-digit positive integer:
1234
The input data is valid!
The data before encryption is: 1234
9 8 7 6 The data after encryption is: 1234

##Modified routine:

/**
 * 数据加密传输
 */
import java.util.Scanner;
public class secretPass {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int num = 0;
        while (true) {
            System.out.println("请输入四位正整数：");
            num = input.nextInt();
            if (num > 999 && num < 10000) {
                System.out.println("输入数据有效！");
                break;
            } else {
                System.out.println("输入数据无效，请重新输入！");
            }
        }
        System.out.println("加密前的数据是：" + num);
        int[] arrs = new int[4];
        arrs[0] = num % 10; // 取个位
        arrs[1] = num / 10 % 10; // 取十位
        arrs[2] = num / 100 % 10; // 取百位
        arrs[3] = num / 1000; // 取千位
 
       // 不能使用for-each语句改变arrs数组的元素
   
     // for-each只能用来遍历打印数组元素
        /*
        for (int n : arrs) { 
            n = (n + 5) % 10; 
            System.out.print(n+" "); 
        }
        */
    
        for (int i = 0; i < arrs.length; i++) {
            arrs[i] = (arrs[i] + 5) % 10;
        }
    
        /*
        for (int i = 0; i < arrs.length; i++) {
            System.out.print(arrs[i] + " ");
        }
        */
        int tmp1 = arrs[0];
        int tmp2 = arrs[1];
        int tmp3 = arrs[2];
        int tmp4 = arrs[3];
        arrs[0] = tmp4;
        arrs[1] = tmp3;
        arrs[2] = tmp2;
        arrs[3] = tmp1;
        System.out.print("加密后的数据是：");
        for (int i : arrs) {
            System.out.print(i);
        }
    }
}

The output result is:

Please enter a four-digit positive integer: 1234
The input data is valid!
The data before encryption is: 1234
The data after encryption is: 6789

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