package test;

import java.util.HashSet;
import java.util.Set;

public class Test {
	
	

	
	public static void main(String[]  args) {
		int[] arr = {1,5,6,3,9,8,6,4};
		sort(arr);	
		System.out.println(arr);
		
		
		
			
	}
	
	private static   void    sort(int[]  arr) {
		
		if (arr.length == 0 || arr == null) {
			
			return;
		}
		int[]   ageTimeArr = new   int[100];
		for (int i = 0; i < 100;i++) {
			ageTimeArr[i] = 0;
		}
		for (int i = 0; i <  arr.length;i++) {
			++ageTimeArr[arr[i]];
		}
		int index = 0;
		for (int i = 0 ;i < 100;i++) {
			
			for (int j = 0;j < ageTimeArr[i];j++) {
				arr[index] = i;
				index++;			
			}
		}
		
		
		
		
	}

}