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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                # Singleton 單列模式? Java中單例模式定義:“一個類有且僅有一個實例,并且自行實例化向整個系統提供。” ~~~ public class SingletonClass{   private static SingletonClass instance = null;   public static SingletonClass getInstance(){   if(instance==null){    synchronized(SingletonClass.class){    if(instance==null){    instance = new SingletonClass();    }    }   }   return instance;   }   private SingletonClass(){    //do something   }  } ~~~ 多選題注意 - 一是單例模式的類只提供私有的構造函數 - 二是類定義中含有一個該類的靜態私有對象 - 三是該類提供了一個靜態的共有的函數用于創建或獲取它本身的靜態私有對象。
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