{//规则:Robert 和 John 是男性 public static IExpression getMaleExpression() { IExpression robert = new TerminalExpression("Robert"); IExpression john = new TerminalExpression("John"); return(new OrExpression(robert, john)); }
//规则:Julie 是一个已婚的女性 public static IExpression getMarriedWomanExpression() { IExpression julie = new TerminalExpression("Julie"); IExpression married = new TerminalExpression("Married"); return(new AndExpression(julie, married)); }