Podsumowanie wzorców projektowych GoF

}break;}default : {abstractExpression = new DvdTitleExpression();break;}}break;}default : return result.toString();}}result.append(abstractExpression.interpret(dvdInterpreterContext));return result.toString();DvdAbstractExpressionpackage pk.dydakt.to.dp.b.gof.interpreter;public abstract class DvdAbstractExpression {public abstract String interpret(DvdInterpreterContext dvdInterpreterContext);}DvdActorExpressionpackage pk.dydakt.to.dp.b.gof.interpreter;import java.util.ArrayList;import java.util.ListIterator;public class DvdActorExpression extends DvdAbstractExpression {public String interpret(DvdInterpreterContext dvdInterpreterContext) {ArrayList actors = dvdInterpreterContext.getAllActors();ListIterator actorsIterator = actors.listIterator();StringBuffer titleBuffer = new StringBuffer("");boolean first = true;while (actorsIterator.hasNext()) {if (!first) {titleBuffer.append(", ");} else {first = false;}titleBuffer.append((String)actorsIterator.next());}return titleBuffer.toString();}}DvdActorTitleExpressionpackage pk.dydakt.to.dp.b.gof.interpreter;import java.util.ArrayList;import java.util.ListIterator;public class DvdActorTitleExpression extends DvdAbstractExpression {85