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Thread: Can anyone answer this?

  1. #1
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    Default Can anyone answer this?

    Why is the print out 99 instead of 88 since its ob1.var1=88 System.out.println("ob1 integer:"+ob1.var1);

    class JavaExample{
       //Static integer variable
       static int var1=69; 
       //non-static string variable
       String var2;
     
       public static void main(String args[])
       {
    	JavaExample ob1 = new JavaExample();
    	JavaExample ob2 = new JavaExample();
    	/* static variables can be accessed directly without
    	 * any instances. Just to demonstrate that static variables
    	 * are shared, I am accessing them using objects so that 
    	 * we can check that the changes made to static variables
    	 * by one object, reflects when we access them using other
    	 * objects
    	 */
            //Assigning the value to static variable using object ob1
    	ob1.var1=88;
    	ob1.var2="I'm Object1";
            /* This will overwrite the value of var1 because var1 has a single 
             * copy shared among both the objects.
             */
            ob2.var1=99;
    	ob2.var2="I'm Object2";
    	System.out.println("ob1 integer:"+ob1.var1);
    	System.out.println("ob1 String:"+ob1.var2);
    	System.out.println("ob2 integer:"+ob2.var1);
    	System.out.println("ob2 String:"+ob2.var2);
       }
    }

    Output:

    ob1 integer:99
    ob1 String:I'm Object1
    ob2 integer:99
    ob2 String:I'm Object2

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Can anyone answer this?

    Having a static variable means that there is only one copy for that variable no matter how many instances of the class.
    Remove the static attribute from the variable's declaration so that each instance of the class will have its own value.

    Read the comments in the code.
    If you don't understand my answer, don't ignore it, ask a question.

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