Java implements Luogu spelling

Title Description
Set nn positive integers (n≤20) (n≤20), connect them in a row to form a largest multi-digit integer.

For example: when n = 3, the maximum integer of three integers 13,312,343 is: 34313213

Another example: when n = 4, the maximum number of four integers 7,13,4,246 connected is: 7424613

Input format The
first line, a positive integer nn.

The second line, nn positive integers.

Output format
A positive integer representing the largest integer

Problem idea: The idea of ​​this problem is to use string exchange to solve the problem, and it is also applied to bubble sorting. For
example, the string a, b is exchanged when a + b <b + a, and the big one is guaranteed to be placed first. Below is the code

import java.util.Scanner;
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
         
        int n = input.nextInt();
        String s1 = input.nextLine();//接受回车字符
        String str = input.nextLine();
        String[] array = str.split(" ");
        /*不是很推荐使用split,最好还是直接创建一个数组，之后赋值
        主要是因为容易犯小错误，nextInt()是不会接受回车的，所以
        str字符串直接接受了回车就会导致数组下标越界
        */
        for(int i = 0; i < n-1;i++ ) //应用冒泡
        {
            for(int j = 0; j < n-1-i; j++)
            {
                if(isLarge(array[j],array[j+1]))
                {
                    String temp ="";
                    temp = array[j];
                    array[j] = array[j+1];
                    array[j+1] = temp;
                }
            }
        }
        for(int i = 0; i < n; i++)
            System.out.print(array[i]);
    }
    public static boolean isLarge(String s1,String s2)
    {
    	/*这个是本题的核心，交换字符串，当a+b < b+a的时候
    	  将b换到a前面
    	*/
        int temp = Integer.parseInt(s1+s2);
        int temp1 = Integer.parseInt(s2+s1);
        
        if(temp1 > temp)
            return true;
        else
            return false;
    }
}

I hope everyone has to help