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

Question

class MyObject {

static int instanceCounter = 0;

static int counter = 0;

MyObject() {

instanceCounter++;

counter = counter + 1;

}

}

I am using the static ints to get this output:

Value of instanceCounter for Object 1: 5

Value of instanceCounter for MyObject: 5

Value of Counter for Object 1: 1

Value of Counter for Object 2: 2

Value of Counter for Object 3: 3

Value of Counter for Object 4: 4

Value of Counter for Object 5: 5

but its displaying

Value of instanceCounter for Object 1: 5

Value of instanceCounter for MyObject: 5

Value of Counter for Object 1: 5

Value of Counter for Object 2: 5

Value of Counter for Object 3: 5

Value of Counter for Object 4: 5

Value of Counter for Object 5: 5

my runner class

class RunMyObject {

public static void main(String[] args) {

MyObject Object1 = new MyObject();

MyObject Object2 = new MyObject();

MyObject Object3 = new MyObject();

MyObject Object4 = new MyObject();


MyObject Object5 = new MyObject();

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

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

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

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

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

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

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

}

}

and if i remove static this is what it displays

Value of instanceCounter for Object 1: 5

Value of instanceCounter for MyObject: 5

Value of Counter for Object 1: 1

Value of Counter for Object 2: 1

Value of Counter for Object 3: 1

Value of Counter for Object 4: 1

Value of Counter for Object 5: 1

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

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++;
    }
}