increments by 1 and add it with every created object? [closed]

Answer 1

Since instanceCounter is a static variable, all objects share the same variable. Since you are incrementing the instanceCounter during each object construction, at the end of creating 5 objects, its value is 5. Consequently you get the output as 5 in all your sys outs. Thats the point of static

EDIT
To achieve what you need, do the following:

class MyObject  {

    static int instanceCounter = 0;

    int counter = 0;

    MyObject() 
    {
        instanceCounter++;
        counter = instanceCounter;
    }

}

Answer 2

You must be confused about the usage of static variables.

static class variables are created once per class. They are shared by all class instances where as non-static class variables are created for every object instance.

So if your counter variable is static it will be created only once and shared by all instances your class.

When you access it with MyObject.counter or object1.counter and so on, you are accessing the same counter variable as static variables can be accessed with a class name as well as with an instance variable.

And if it is non-static and every instance(or object) of your class will have its own copy of counter.
So each of your Object1 , Object2 and so on will all have their own counter variable.

And all of them will have value 1 and so you get 1 in the output.

UPDATE:

Change your code to get your desired output that you have mentioned in a comment of one of the answers:

MyObject Object1 = new MyObject();

System.out.println(“Value of Counter for Object 1: ” + Object1.counter);

MyObject Object2 = new MyObject();

System.out.println(“Value of Counter for Object 2: ” + Object2.counter);

MyObject Object3 = new MyObject();

System.out.println(“Value of Counter for Object 3: ” + Object3.counter);

MyObject Object4 = new MyObject();

System.out.println(“Value of Counter for Object 4: ” + Object4.counter);

MyObject Object5 = new MyObject();

System.out.println(“Value of Counter for Object 5: ” + Object5.counter);

System.out.println(“Value of instanceCounter for Object 1: ” + Object1.instanceCounter);

System.out.println(“Value of instanceCounter for MyObject: ” + MyObject.instanceCounter);

Answer 3

If you want to do it like this, you should add another variable, i.e.:

class MyObject {

    int instanceCounter = 0;

    static int counter = 0;

    MyObject() {

        instanceCounter = counter;
        counter++;
    }
}