question: public String toStringByValue ( ) { IntArrayList theKeys = new IntArrayList ( ) ; keysSortedByValue ( theKeys ) ; StringBuffer buf = new StringBuffer ( ) ; buf . append ( "[" ) ; int maxIndex = theKeys . size ( ) - 1 ; for ( int i = 0 ; i <= maxIndex ; i ++ ) { int key = theKeys . get ( i ) ; buf . append ( String . valueOf ( key ) ) ; buf . append ( "->" ) ; buf . append ( String . valueOf ( get ( key ) ) ) ; if ( i < maxIndex ) buf . append ( ", " ) ; } buf . append ( "]" ) ; return buf . toString ( ) ; }
target:  Returns a string representation of the receiver, containing the String representation of each key-value pair, sorted ascending by value.