Java code to explain effect of Reflection // on Singleton property

Deepika Sahu answered on December 25, 2022 Popularity 1/10 Helpfulness 1/10

answer Java code to explain effect of Reflection // on Singleton property

Java code to explain effect of Reflection // on Singleton property

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// Java code to explain effect of Reflection
// on Singleton property
 
import java.lang.reflect.Constructor;
 
// Singleton class
class Singleton {
    // public instance initialized when loading the class
    public static Singleton instance = new Singleton();
 
    private Singleton()
    {
        // private constructor
    }
}
 
public class GFG {
 
    public static void main(String[] args)
    {
        Singleton instance1 = Singleton.instance;
        Singleton instance2 = null;
        try {
            Constructor[] constructors
                = Singleton.class.getDeclaredConstructors();
            for (Constructor constructor : constructors) {
                // Below code will destroy the singleton
                // pattern
                constructor.setAccessible(true);
                instance2
                    = (Singleton)constructor.newInstance();
                break;
            }
        }
 
        catch (Exception e) {
            e.printStackTrace();
        }
 
        System.out.println("instance1.hashCode():- "
                           + instance1.hashCode());
        System.out.println("instance2.hashCode():- "
                           + instance2.hashCode());
    }
}

Popularity 1/10 Helpfulness 1/10 Language java

Source: www.geeksforgeeks.org

Tags: effect explain java reflection singleton

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