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设计模式(三):建造者模式

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   建造者模式 UML类图: 说明:   Director指挥者类可以调用所有建造者抽象类Builder1,Builder2,Builder3 …   每一个建造者抽象类Builder只生产一类产品,类中分别规定了生产各个构件...

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设计模式(二):单例模式(DCL及解决办法)

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public class Singleton { //懒汉模式 双重检查锁定DCL(double-checked locking) //缺点:由于jvm存在乱序执行功能,DCL也会出现线程不安全的情况。(DCL失效问题) // jdk1.6...

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提示: UML类图中,空心三角实线,为继承关系;       空心三角虚线,为实现接口;       实线箭头,为关联关系;       虚线箭头,为依赖关系;       实心菱形实线箭头,为组合(合成)关系;       空心菱形实线箭...

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