工厂模式（懒汉式、饿汉式）

package factory; /**  * 饿汉式工厂  *   * @ClassName: Factory1.java  * @Description: 不管你用不用，进来后直接就帮你创建对象  * @Author lyf  * @Date 2017年3月10日 上午9:33:37  *  */ public class Factory1 { private Factory1() { } private static Factory1 factory1 = new Factory1(); public static Factory1 getInstance() { return factory1; }

}

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package factory; /**  * 懒汉式工厂  *   * @ClassName: Factory2.java  * @Description: 不立即生成，存在线程不安全，所以上同步锁  * @Author lyf  * @Date 2017年3月10日 上午9:35:43  *  */ public class Factory2 { private Factory2() { } private static Factory2 factory2 = null; private synchronized static Factory2 getInstance() { if (factory2 == null) { factory2 = new Factory2(); } return factory2; } }