Code-Based Interoperability and Dynamic Query Construction

class IntAbstraction { IntExpression plus(IntAbstraction rightSide ){ return new IntExpression( this ," + ", rightSide); } IntExpression multiply( IntAbstraction rightSide){ return new IntExpression( this , " * " , rightSide ); } abstract String generateCode(); }String generateCode(); } class IntExpression extends IntAbstraction { 1Furthermore, adequate method design can help ensuring the correct sequence of elements. For example, brackets have to be opened and then closed. There must be as many opening brackets as closing brackets. Instead of offering two clumsy methods called setLeftBracket() and setRightBracket() it is of advantage to use the setBrackets() method, which sets pairs of brackets at the same time. Setting them separately invites errors due to unmatched brackets. In contrast, the method setBrackets() guarantees that brackets are set in pairs or not at all. Additionally, a robust implementation of setBrackets() eliminates the empty brackets error.