Template Method Pattern 模板方法模式
1. 简介
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在一些方法中定义一个算法的骨架，而将一些步骤延迟到子类中。
模板方法使得子类可以在不改变算法结构的情况下，重新定义算法中的某些步骤。
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2.类图
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3.实例
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--摘自Junit的TestCase源码
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......public abstract class TestCase extends Assert implements Test {...... /** * Runs the bare test sequence. * @exception Throwable if any exception is thrown */public void runBare() throws Throwable {setUp();try {runTest();}finally {tearDown();}}/** * Sets up the fixture, for example, open a network connection. * This method is called before a test is executed. */protected void setUp() throws Exception {}/** * Tears down the fixture, for example, close a network connection. * This method is called after a test is executed. */protected void tearDown() throws Exception {}......}?