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Java Singleton pattern

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Cabs answered on February 20, 2020 Popularity 9/10 Helpfulness 2/10

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Java Singleton pattern

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public class Singleton {
    private static Singleton instance;

    private Singleton() {}

    public static Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }
}

Popularity 9/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java singleton

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Contributed on Jul 26 2023

Cabs

0 Answers Avg Quality 2/10

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java singleton implementation

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public class SingletonClass {
    private static final SingletonClass SINGLE_INSTANCE = new SingletonClass();
    private SingletonClass() {}
  public static SingletonClass getInstance() {
      return SINGLE_INSTANCE;
    }
}

Popularity 10/10 Helpfulness 4/10 Language java

Source: dzone.com

Tags: implementation impl

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Contributed on Feb 20 2020

Java Hater

0 Answers Avg Quality 2/10

java singleton

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- A private constructor
- A static field containing its only instance
- A static factory method for obtaining the instance

public final class ClassSingleton 
{

    private static ClassSingleton INSTANCE;
    private String info = "Initial info class";
    
    private ClassSingleton() 
	{        
    }
    
    public static ClassSingleton getInstance() 
	{
        if(INSTANCE == null) 
        {
            INSTANCE = new ClassSingleton();
        }
  
        return INSTANCE;
    }

    // getters and setters
}

                      =============Usage============
                        

To use our ClassSingleton, we simply need to get the instance statically:

ClassSingleton classSingleton1 = ClassSingleton.getInstance();

System.out.println(classSingleton1.getInfo()); //Initial class info

ClassSingleton classSingleton2 = ClassSingleton.getInstance();
classSingleton2.setInfo("New class info");

System.out.println(classSingleton1.getInfo()); //New class info
System.out.println(classSingleton2.getInfo()); //New class info

Popularity 10/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: java

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Contributed on Jan 08 2021

Mustafa Mbari

0 Answers Avg Quality 2/10

java singleton

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public class SingletonOnDemand {
	
	private SingletonOnDemand () {}
	private static class Singleton {
		private static final SingletonOnDemand instance = new SingletonOnDemand();
	}
	
	public static SingletonOnDemand getInstance () {
		System.out.println("create instance");
		return Singleton.instance;
	}
}

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: java

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Contributed on May 18 2020

Super Stoat

0 Answers Avg Quality 2/10

java Singleton

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public class Singleton {
    // Private static variable to hold the single instance of the class
    private static Singleton instance;

    // Private constructor to prevent instantiation from outside the class
    private Singleton() {
        // Initialization code, if needed
    }

    // Public static method to get the single instance of the class
    public static Singleton getInstance() {
        // Lazy initialization: create the instance if it doesn't exist yet
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }

    // Other methods and variables can be added here as needed
}

Popularity 7/10 Helpfulness 3/10 Language java

Source: chat.openai.com

Tags: java singleton

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Contributed on Jan 28 2024

Savindi Dadallage

0 Answers Avg Quality 2/10

java singleton

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public class DB {
    // champs de l'objet

    private DB(){
        // initialisation des champs
    }

    private static final DB INSTANCE = new DB();
    public static DB getInstance(){
        return INSTANCE;
    }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java

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Contributed on Dec 16 2021

Silly Sheep

0 Answers Avg Quality 2/10

java singleton

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public final class SomeSingleton {
   public static final SomeSingleton INSTANCE;

   private SomeSingleton() {
      INSTANCE = (SomeSingleton)this;
      System.out.println("init complete");
   }

   static {
      new SomeSingleton();
   }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: java

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Contributed on Apr 21 2021

VasteMonde

0 Answers Avg Quality 2/10

Singleton pattern with java example

Comment

public class Singleton {
    // Private static instance variable to hold the single instance
    private static Singleton instance;

    // Private constructor to prevent instantiation from other classes
    private Singleton() {
        // Initialization code, if needed
    }

    // Public static method to get the single instance
    public static Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }

    // Other methods of the Singleton class
    public void showMessage() {
        System.out.println("Hello, I am a Singleton!");
    }
}

Popularity 9/10 Helpfulness 2/10 Language java

Source: chat.openai.com

Tags: java

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Contributed on Aug 11 2023

Hilarious Heron

0 Answers Avg Quality 2/10

Java Singleton Class Syntax

Comment

class SingletonExample {

   // private field that refers to the object
   private static SingletonExample singleObject;
                                              
   private SingletonExample() {
      // constructor of the SingletonExample class
   }

   public static SingletonExample getInstance() {
      // write code that allows us to create only one object
      // access the object as per our need
   }
}

Popularity 10/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: class clas

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Contributed on May 24 2022

SAMER SAEID

0 Answers Avg Quality 2/10

Java Singleton Class Syntax

Comment

class SingletonExample {

   // private field that refers to the object
   private static SingletonExample singleObject;
                                              
   private SingletonExample() {
      // constructor of the SingletonExample class
   }

   public static SingletonExample getInstance() {
      // write code that allows us to create only one object
      // access the object as per our need
   }
}

Popularity 10/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: class clas

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Contributed on May 24 2022

SAMER SAEID

0 Answers Avg Quality 2/10

Java Singleton pattern

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