import java.lang.ref.WeakReference;
import java.util.WeakHashMap;
class WeakPool<T> {
private final WeakHashMap<T, WeakReference<T>> pool = new WeakHashMap<T, WeakReference<T>>();
public T get(T object) {
final T res;
WeakReference<T> ref = pool.get(object);
if (ref != null) {
res = ref.get();
} else {
res = null;
}
return res;
}
public void put(T object) {
pool.put(object, new WeakReference<T>(object));
}
}
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