1.Singleton(单例)
作用:保证类只有一个实例;提供一个全局访问点
JDK中体现:
(1)Runtime
(2)NumberFormat
类图:
public class Singleton { private static Singleton instance=new Singleton(); private Singleton() { } public static Singleton newInstance() { return instance; } }
1.Singleton(单例)
作用:保证类只有一个实例;提供一个全局访问点
JDK中体现:
(1)Runtime
(2)NumberFormat
类图:
public class Singleton { private static Singleton instance=new Singleton(); private Singleton() { } public static Singleton newInstance() { return instance; } }