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<h3 align="center">设计模式之Interpreter(解释器)</h3>
<p align="center"><a href="http://www.jdon.com/aboutme.htm">板桥里人</a> http://www.jdon.com 2002/05/05</p>
<p align="center"><a href="../mybook/index.htm" target="_blank"><strong>模式实战书籍《Java实用系统开发指南》</strong></a></p>
<p>Interpreter解释器模式定义:<br>
定义语言的文法 ,并且建立一个解释器来解释该语言中的句子.</p>
<p>Interpreter似乎使用面不是很广,它描述了一个语言解释器是如何构成的,在实际应用中,我们可能很少去构造一个语言的文法.我们还是来简单的了解一下:</p>
<p>首先要建立一个接口,用来描述共同的操作.</p>
<p>public interface AbstractExpression { <br>
void interpret( Context context ); <br>
} </p>
<p>再看看包含解释器之外的一些全局信息</p>
<p>public interface Context { } </p>
<p>AbstractExpression的具体实现分两种:终结符表达式和非终结符表达式:</p>
<p>public class TerminalExpression implements AbstractExpression { <br>
public void interpret( Context context ) { }<br>
} </p>
<p>对于文法中没一条规则,非终结符表达式都必须的:<br>
public class NonterminalExpression implements AbstractExpression { <br>
private AbstractExpression successor; <br>
<br>
public void setSuccessor( AbstractExpression successor ) { <br>
this.successor = successor; <br>
} <br>
<br>
public AbstractExpression getSuccessor() { <br>
return successor; <br>
}<br>
<br>
public void interpret( Context context ) { } <br>
} </p>
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