can we create an object of class inside instance block?-CodePudding

class ObjectCreation {
    {
        ObjectCreation obj = new ObjectCreation();
        System.out.println("I am Instance Block Object "   obj.hashCode());
    }     

    public static void main(String[] args) {
        ObjectCreation obj = new ObjectCreation();
        System.out.println("I am main method Object "   obj.hashCode());
    }
}

.java:5) at ObjectCreation.(ObjectCreation.java:5)

I found this runtime exception on console. Why we are not able to create object of same class? in instance block

CodePudding user response：

Because it would lead to an infinite loop.

So in your main code you want to create a new instance of ObjectCreation, like so :

 ObjectCreation Obj = new ObjectCreation();

So the JVM has to initialise that new object, which means it will call the instance block for it - which does a

ObjectCreation Obj = new ObjectCreation();

So the JVM has to initialise that new object, which means it will call the instance block for it - which …

well, you get the idea !

CodePudding user response：

Initializer blocks are used to initialize instance variables. Post compilation, Java compiler copies initializer blocks into every constructor. Read more about initializer block here.