摘要：1.线程不安全略2.同步方法单例略3.双重检测public class LazyDoubleCheckSingleton { private static volatile LazyDoubleCheckSingleton instance = null; private LazyDoubleChe 阅读全文

摘要：@Data public class PrototypeSheep implements Cloneable{ private String name; private Integer age; private String color; private PrototypeSheep friend; 阅读全文