Java打印输入数字的个位，十位，百位，千位，万位的数字

package cn.itcast.spring;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Test4 {
    public static void main(String[] args) {
        int num = 12345;
        int wan = num / 10000 % 10;
        System.out.println("wan = " + wan);
        int qian = num / 1000 % 10;
        System.out.println("qian = " + qian);
        int bai = num / 100 % 10;
        System.out.println("bai = " + bai);
        int shi = num / 10 % 10;
        System.out.println("shi = " + shi);
        int ge = num % 10;
        System.out.println("ge = " + ge);

        System.out.println("----------------");

        int num1 = 5678;
        int qian1 = num1 / 1000 % 10;
        System.out.println("qian1 = " + qian1);
        int bai1 = num1 / 100 % 10;
        System.out.println("bai1 = " + bai1);
        int shi1 = num1 / 10 % 10;
        System.out.println("shi1 = " + shi1);
        int ge1 = num1 % 10;
        System.out.println("ge1 = " + ge1);

        System.out.println("----------------");
        
        while (true) {
            System.out.println("input number : ");
            Scanner sc = new Scanner(System.in);
            int input = sc.nextInt();
            if (input == 0) {
                // return;
                break;
            }
            String sNum = String.valueOf(input);
            int length = sNum.length();

            List<String> list = new ArrayList<>();

            String str1 = ("个位 = " + input / 1 % 10);
            String str2 = ("十位 = " + input / 10 % 10);
            String str3 = ("百位 = " + input / 100 % 10);
            String str4 = ("千位 = " + input / 1000 % 10);
            String str5 = ("万位 = " + input / 10000 % 10);
            String str6 = ("十万位 = " + input / 100000 % 10);
            String str7 = ("百万位 = " + input / 1000000 % 10);
            String str8 = ("千万位 = " + input / 10000000 % 10);
            String str9 = ("亿位 = " + input / 100000000 % 10);
            String str10 = ("十亿位 = " + input / 1000000000 % 10);

            Collections.addAll(list,str1,str2,str3,str4,str5,str6,str7,str8,str9,str10);

            for (int i = 0; i < length; i++) {
                System.out.println(list.get(i));
            }
        }
    }
}