/guava/guava/src/com/google/common/collect/Maps.java
this.onlyOnLeft = unmodifiableMap( onlyOnLeft) ;this.onlyOnRight = unmodifiableMap( onlyOnRight) ;
this.onlyOnRight = unmodifiableMap ( onlyOnRight ) ;
MapDifferenceImpl( Map<K, V> onlyOnLeft, Map<K, V> onlyOnRight, Map<K, V> onBoth, Map<K, ValueDifference<V>> differences) { this.onlyOnLeft = unmodifiableMap(onlyOnLeft); <extra_id_0> this.onBoth = unmodifiableMap(onBoth); this.differences = unmodifiableMap(differences); } @Override public boolean areEqual() { return onlyOnLeft.isEmpty() && onlyOnRight.isEmpty() && differences.isEmpty();