Single case Mode &synchronized

Source: Internet
Author: User
Package COM.IBM.DG;
        public class Main {public static void main (string[] args) {//TODO auto-generated method stub
        Singletonclass s1 =singletonclass.getinstall ();
        Singletonclass s2 = Singletonclass.getinstall ();   System.out.println (S1==S2);  True System.out.println (s1.equals (S2));
True}}//single case mode scenario and Opportunity:///////////////////////////////

The resource pool creates the connection, the database connects, but the general database all uses the connection pool, the single example pattern can cause waits package; public class Singletonclass {private Singletonclass () {}//define private constructor method private static Singletonclass Install=nul
    L public static Singletonclass Getinstall () {if (install = null) {synchronized (Singletonclass.class) {// Synchronized when two concurrent threads access the synchronized (this) synchronized code block in the same object,//Only one time Threads are executed.
                Another thread must wait until the current thread finishes executing the code block before executing the code block.
                if (install = = NULL) {install = new Singletonclass ();
      }      } return install;


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