Hj9 extract non duplicate integers

describe

Enter a int Type integer , Read right to left , Returns a new integer with no repeating numbers .

Ensure that the last bit of the input integer is not 0 .

Data range ： 1 \le n \le 10^{8} \1≤n≤108 

Input description ：

Enter a int Type integer

Output description ：

Read right to left , Returns a new integer with no repeating numbers

Example 1

Input ：9876673

Output ：37689

import java.util.Scanner;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
/**
*Author: Xiang min 
*Date:2022/07/22 15:22
*/
public class Main
{
    public static void main(String[] args)
    {
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNext())
        {
            int input = scanner.nextInt();
            System.out.println(getInteger(input+""));
        }
        scanner.close();
    }
    
    // Extract non duplicate integers 
    private static String getInteger(String numStr)
    {
        StringBuilder builder = new StringBuilder();
        
        HashSet<Character> set = new LinkedHashSet<>();
        // Input the integer in reverse order into the linked list set , You can get rid of it 
        
        for (int i = numStr.length() - 1; i >= 0;i--)
        {
            set.add(numStr.charAt(i));
        }
        
        // Enter the integers in the set into the string container 
        for (Character c : set)
        {
            builder.append(c);
        }
        
        // If the first letter is 0
        if (builder.charAt(0) == '0')
        {
            return builder.substring(1,builder.length());
        }
        
        return builder.toString();
    }
}