question: public boolean equals ( Object obj ) { if ( obj == this ) { return true ; } if ( obj instanceof Map == false ) { return false ; } Map map = ( Map ) obj ; if ( map . size ( ) != size ( ) ) { return false ; } MapIterator it = mapIterator ( ) ; try { while ( it . hasNext ( ) ) { Object key = it . next ( ) ; Object value = it . getValue ( ) ; if ( value == null ) { if ( map . get ( key ) != null || map . containsKey ( key ) == false ) { return false ; } } else { if ( value . equals ( map . get ( key ) ) == false ) { return false ; } } } } catch ( ClassCastException ignored ) { return false ; } catch ( NullPointerException ignored ) { return false ; } return true ; }
target:  Compares this map with another.