解释器模式——HeadFirst设计模式学习笔记

 1 //解释器接口
 2 public interface Expression {
 3    public boolean interpret(String context);
 4 }
 5 
 6 //实现Or解释器
 7 public class OrExpression implements Expression {
 8      
 9    private Expression expr1 = null;
10    private Expression expr2 = null;
11 
12    public OrExpression(Expression expr1, Expression expr2) { 
13       this.expr1 = expr1;
14       this.expr2 = expr2;
15    }
16 
17    @Override
18    public boolean interpret(String context) {        
19       return expr1.interpret(context) || expr2.interpret(context);
20    }
21 }