A quick way to calculate repeat times of each element in an array, which contains 100 random numbers between 0 and 30

findRepeat.java

package arr;

import java.util.Random;

public class arrTest {

	public static void main(String[] args) {

		int[] randNum = new int[100];
		int[] count = new int[31];
		Random r = new Random();
		for(int i = 0;i<100;i++){
			randNum[i] = r.nextInt(30)+1;
			System.out.print(randNum[i]+".");
			count[randNum[i]]++;
		}
		System.out.println();
		for(int i=1;i<31;i++){
			System.out.print(count[i]+",");
		}
	}
}