解释器模式的类图如下:

定义了上下文对象,在对象中有两个数,我们要对这两个数进行对应的运算。我们在接口中定义了解释器,其中有一个解释的方法。在加法中我们实际的解释加的具体操作是什么。
[java] view plaincopy
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public interface Expression {
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public int interpret(Context context);
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}
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public class Plus implements Expression {
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@Override
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public int interpret(Context context) {
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return context.getNum1()+context.getNum2();
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}
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}
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public class Minus implements Expression {
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@Override
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public int interpret(Context context) {
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return context.getNum1()-context.getNum2();
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}
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}
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public class Context {
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private int num1;
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private int num2;
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public Context(int num1, int num2) {
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this.num1 = num1;
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this.num2 = num2;
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}
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public int getNum1() {
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return num1;
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}
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public void setNum1(int num1) {
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this.num1 = num1;
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}
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public int getNum2() {
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return num2;
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}
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public void setNum2(int num2) {
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this.num2 = num2;
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}
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}
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public class Test {
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public static void main(String[] args) {
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// 计算9+2-8的值
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int result = new Minus().interpret((new Context(new Plus()
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.interpret(new Context(9, 2)), 8)));
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System.out.println(result);
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}
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}
解释器模式
原文:http://blog.csdn.net/u012613903/article/details/44652491