JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Singleton Class Example Using Private Constructor

  • We can make constructor as private. So that We can not create an object outside of the class.
  • This property is useful to create singleton class in java.
  • Singleton pattern helps us to keep only one instance of a class at any time.
  • The purpose of singleton is to control object creation by keeping private constructor.

Java Singleton Sample Code

Code:
package com.myjava.constructors;

public class MySingleTon {
    
    private static MySingleTon myObj;
    /**
     * Create private constructor
     */
    private MySingleTon(){
        
    }
    /**
     * Create a static method to get instance.
     */
    public static MySingleTon getInstance(){
        if(myObj == null){
            myObj = new MySingleTon();
        }
        return myObj;
    }
    
    public void getSomeThing(){
        // do something here
        System.out.println("I am here....");
    }
    
    public static void main(String a[]){
        MySingleTon st = MySingleTon.getInstance();
        st.getSomeThing();
    }
}

Other Constructor Examples

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What is race condition?
A race condition is a situation in which two or more threads or processes are reading or writing some shared data, and the final result depends on the timing of how the threads are scheduled. Race conditions can lead to unpredictable results and subtle program bugs. A thread can prevent this from happening by locking an object. When an object is locked by one thread and another thread tries to call a synchronized method on the same object, the second thread will block until the object is unlocked.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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