private void add() {
int i = 0;
while (i < count) {
Random rand = new Random();
int r = rand.nextInt(50);
if (!hashMap.containsKey(r)) {
hashMap.put(r, r);
i++;
}
}
}
private void remove() {
int i = 0;
while (i < count) {
Random rand = new Random();
int r = rand.nextInt(50);
if (hashMap.containsKey(r)) {
hashMap.remove(r);
i++;
}
}
}
public void run() {
if (id % 2 == 0) {
add();
} else {
remove();
}
// size should include changes made by other threads
// (should equal last printed size plus ADD(s) and minus REMOVE(s)
System.out.println("size: " + hashMap.size());
}
