#Java - Code Snippets for '#Static block'

#Java - Code Snippets for '#Static block' - 4 code snippet(s) found

Sample 1. Singleton Class ( using private constructor , object initialization using static method, doubly checked , thread safe, synchronized , volatile reference )

class Singleton {

   private static volatile Singleton instance = null;

   private Singleton(){}

   public static Singleton getInstance() {

      if (instance == null) {            

         synchronized(Singleton.class) {

            if (instance== null)

               instance = new Singleton(); 

            }

         }

      return instance;

   }

}

_{Like Feedback singleton singleton class volatile private constructor object initialization using static method doubly checked thread safe synchronized block using class level lock synchronized synchronized block class level lock object initialization using getInstance}

Sample 2. Initialize maps through static block

public class CoinChanger {

   private static Map<Currency, Integer> cashBox;

   private static Map<Currency, Integer> change;



        enum Currency {

      DOLLAR,QUARTER,DIME,NICKEL,PENNY;

         }



   static {

      cashBox = new TreeMap<Currency, Integer>();

      change = new TreeMap<Currency, Integer>();

      initializeCashBox();

   }



   private static void initializeCashBox(){

      //set the cash box

      cashBox.put(Currency.DOLLAR, 50);

      cashBox.put(Currency.QUARTER, 0);

      cashBox.put(Currency.DIME, 50);

      cashBox.put(Currency.NICKEL, 50);

      cashBox.put(Currency.PENNY, 50);

   }

   }

}

_{Like Feedback static block enum initializing maps initializing treemap}

Sample 3. Declaring static block

public abstract class TestClass {

      static{

             init();

        }



      public static void main(String[] args){

      }



      private init(){

      }

}

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Sample 4. Usage of Static Block and Instance Initialization Block

public class BuggyBread { 



   static {

      System.out.println("Static Block"); 

   } 



   { 

      System.out.println("Instance Initialization Block");

   } 



   BuggyBread(){

      System.out.println("Constructor");

   }



   public static void main(String[] args){

      System.out.println("Main Method");

      new BuggyBread();

   }

}

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