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/*
* @test
* @bug 4339792
* @summary Basic test for Collections.disjoint
* @author Josh Bloch
*/
import java.util.*;
public class Disjoint {
final static int N = 20;
public static void main(String args[]) {
// Make an array of lists each of which shares a single element
// with its "neighbors," and no elements with other lists in the array
Random rnd = new Random();
List[] lists = new List[N];
int x = 0;
for (int i = 0; i < N; i++) {
int size = rnd.nextInt(10) + 2;
List<Integer> list = new ArrayList<Integer>(size);
for (int j = 1; j < size; j++)
list.add(x++);
list.add(x);
Collections.shuffle(list);
lists[i] = list;
}
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
boolean disjoint = (Math.abs(i - j) > 1);
List<Integer> a = (List<Integer>) lists[i];
List<Integer> b = (List<Integer>) lists[j];
if (Collections.disjoint(a, b) != disjoint)
throw new RuntimeException("A: " + i + ", " + j);
if (Collections.disjoint(new HashSet<Integer>(a), b)
!= disjoint)
throw new RuntimeException("B: " + i + ", " + j);
if (Collections.disjoint(new HashSet<Integer>(a),
new HashSet<Integer>(b)) != disjoint)
throw new RuntimeException("C: " + i + ", " + j);
}
}
}
}