Java Collection How to - Create an int array with randomly shuffled numbers in a given range

• Back to Array  ↑

Question

We would like to know how to create an int array with randomly shuffled numbers in a given range.

Answer

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/*from www  .j  av a 2 s.  com*/
public class Main {
  public static void main(String args[]) {
    List<Integer> dataList = new ArrayList<Integer>();
    for (int i = 0; i < 10; i++) {
      dataList.add(i);
    }
    Collections.shuffle(dataList);
    int[] num = new int[dataList.size()];
    for (int i = 0; i < dataList.size(); i++) {
      num[i] = dataList.get(i);
    }
    System.out.println(Arrays.toString(num));
  }
}

The code above generates the following result.

• Back to Array  ↑