A question about array

.java

import java.util.ArrayList;
import java.util.List;

public class Question {

	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static void main(String[] args) {
		
		int ind[] = { 1, 1, 2 ,2 ,2 ,3 ,3, 3, 3, 4, 4, 4};
		List x = new ArrayList();
		List y = new ArrayList();
		int k=4;
		for(int i=0 ;i<ind.length;i++){
			if(ind[i] == k)
				x.add(i);
			else
				y.add(i);
		}
		System.out.println(x);
		System.out.println(y);
	}
}