Scope of static variable and methods in Java
<p>I have some doubts about usage of static method in Java.
I read many places static variables are instance independent so be comes global.</p>

<pre><code>public class ThirdClass {
    public static var = "Java";
}

public class Second {
    public static void main(String[] args) {
        ThirdClass ob1 = new ThirdClass();
        System.out.println(ob1.var);   // prints Java
        ob1.var="Ruby";
        ThirdClass ob2 = new ThirdClass();
        System.out.println(ob2.var);   // prints Ruby
    }
}

public class First {
    public static void main(String[] args) {
        ThirdClass ob3 = new ThirdClass();
        System.out.println(ob1.var);   // prints Java again!!!
    }
}
</code></pre>

<p>As you see in second class multiple instance of ThirdClass  sharing same instance of variable var. But a separate instance in class First don't access the final value "Ruby"  but show original "Java".  It means the static variable are NOT global variable but only global to single execution!!!</p>

<p>Also do is creating static variable resource intensive  compared to instance variable?</p>

<p>Please suggest.</p>
