#Java - Code Snippets for '#Constructor'

#Java - Code Snippets for '#Constructor' - 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. Class bean with getter , setter and constructor

public class Employee {

   public String name;

   public int age;

   public int salary;



   Employee(String name, int age, int salary) {

      this.name = name;

      this.age = age;

      this.salary = salary;

   }



   public String getName() {

      return name;

   }



   public void setName(String name) {

      this.name = name;

   }



   public int getAge() {

      return age;

   }



   public void setAge(int age) {

      this.age = age;

   }



   public int getSalary() {

      return salary;

   }



   public void setSalary(int salary) {

      this.salary = salary;

   }

}

_{Like Feedback bean pojo plain java objects getters setters getters nd setters classes class constructor parameterized constructor this keyword}

Sample 3. Constructor Overloading

public class Employee {

     public String name;

     public int age;

     public int salary;

     

     // No Argument Constructor

     Employee(){

        this.name = "";

        this.age = 0;

        this.salary = 0;

     }

     

     // Single Argument Constructor

     Employee(String name){

        this.name = name;

        this.age = 0;

        this.salary = 0;

     }

     

     // Argument Constructor

     Employee(String name,int age){

        this.name = name;

        this.age = age;

        this.salary = 0;

     }

     

     // Argument Constructor

     Employee(String name,int age,int salary){

        this.name = name;

        this.age = age;

        this.salary = salary;

     }

}

_{Like Feedback constructor constructor overloading}

Sample 4. Initialize member elements ( maps ) using constructor

public class CoinChanger {

   private static Map<Currency, Integer> cashBox;

   private static Map<Currency, Integer> change;



   enum Currency {

      DOLLAR,QUARTER,DIME,NICKEL,PENNY;

         }



   CoinChanger() {

      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 constructor initializing maps initializing treemap enum}

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