public long get(K key) {
    AtomicLong atomic = map.get(key);
    return atomic == null ? 0L : atomic.get();
  }
public long get(K key) {
    AtomicLong atomic = map.get(key);
    return atomic == null ? 0L : atomic.get();
  }
public long get ( K key ) { AtomicLong atomic = map . get ( key ) ; return atomic == null ? 0L : atomic . get ( ) ; }
Returns the value associated with {@code key}, or zero if there is no value associated with
{@code key}.
Returns the value associated with {