代码：

//import java.util.Scanner;
public class practice{
    public static void main(String[] args) {
        int arr [] = {1,2,3,4};
        String str = arrToString(arr);
        System.out.println(str);
    }
    public static String arrToString(int [] arr){
        if(arr==null)
        {
            return "";
        }
        if(arr.length==0){
            return "[]";
        }
        String result ="[";
        String result1 = "]";
        for (int i = 0; i < arr.length; i++) {
            if(i==arr.length-1){
                result = result + arr[i];
            }else{
                result = result + arr[i]+", ";
            }
        }
        result=result+result1;
        return result;
    }
}

代码结果：

自己写的代码：

import java.util.Scanner;
public class practice{
    public static void main(String[] args) {
        //键盘录入一个字符串，并进行遍历；
        Scanner input = new Scanner(System.in);
        System.out.println("输入一个字符串：");
        String a = input.next();
        print(a);
        printReserve(a);
        print(a);
    }
    public static void printReserve(String a){
        for(int i=a.length()-1;i>-1;i--) {
            char c = a.charAt(i);
            System.out.print(c+"\t");
        }
        System.out.println();
    }
    public static void print(String a){
        for(int i=0;i<a.length();i++) {
            char c = a.charAt(i);
            System.out.print(c+"\t");
        }
        System.out.println();
    }
}

代码运行结果截图：

视频代码：

听了以上步骤，自己写的代码：

import java.util.Scanner;
public class practice{
    static int count = 0;
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int money;
        while (true) {
            System.out.println("请输入金额：");
            money = input.nextInt();
            if (money >= 0 && money <= 9999999) {
                break;
            } else {
                System.out.println("输入错误，请重新输入 ");
            }
        }
        //System.out.println(money);
        //获取各个位
        String da = "";
        while (money != 0) {
            int ge = money % 10;
            money = money / 10;
            String number = func(ge);

            da =number+ func3(count)+da;
            count++;
        }
        System.out.println(da);
        System.out.println(func1(da));
    }
    public static String func1(String da) {
        for (int i = count; i < 7; i++) {
            da = func(0) +func3(i)+ da;
        }
        return da;
    }
    public static String func(int ge) {
        String [] nums = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
        return nums[ge];
    }
    public static String func3(int ge){
        String [] nums = {"元", "拾", "佰", "仟", "万", "拾", "佰"};
        return nums[ge];
    }
}

代码结果：

视频代码：