01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 | public class SingletonPattern() { private static SingletonPattern singleton = null; private SingletonPattern() { } //通過(guò)該方法獲得實(shí)例對(duì)象 public static SingletonPattern GetSingleton() { if(singleton == null) { //多個(gè)線(xiàn)程判斷instance都為null時(shí)，在執(zhí)行new操作時(shí)多線(xiàn)程會(huì)出現(xiàn)重復(fù)情況 singleton = new SingletonPattern (); } return singleton; } } |
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 | public class SingletonPattern() { private static SingletonPattern singleton = null; private SingletonPattern() { } //通過(guò)該方法獲得實(shí)例對(duì)象 public static SingletonPattern GetSingleton() { if(singleton == null) { //使用synchronized關(guān)鍵字，防止多個(gè)線(xiàn)程判斷instance都為null時(shí)，在執(zhí)行new操作時(shí)多線(xiàn)程會(huì)出現(xiàn)重復(fù)情況 synchronized (SingletonPattern.class) { if (instance == null) { instance = new SingletonPattern(); } } } return singleton; } } |
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 | public class SingletonPattern() { private SingletonPattern() { } private static class SingletonHelp() { static SingletonPattern singleton = new SingletonPattern(); } //通過(guò)該方法獲得實(shí)例對(duì)象 public static SingletonPattern GetSingleton() { return singleton; } } |
