/guava/guava/src/com/google/common/util/concurrent/AtomicLongMap.java
return remove ( key, 0 ) ;
} boolean remove(K key, long value) { return map.remove(key, value); } @CanIgnoreReturnValue public boolean removeIfZero(K key) { <extra_id_0> } public void removeAllZeros() { map.values().removeIf(x -> x == 0); } public long sum() { return map.values().stream().mapToLong(Long::longValue).sum();