public class Main {
    String variable  ;
    
    
    public static void main(String[] args) {
        System.out.println("Hello World!");
        B b = new B();
       
    }

    public Main(){
    	printVariable();
    }

    protected void printVariable(){
        variable = "variable is initialized in Main Class";
    }
}
public class B extends Main {
    String variable = null ;

    public B(){
        System.out.println("variable value = " + variable);
    }

    public void setVal(){
    	variable = "setVal";
    }
    protected void printVariable(){
        variable = "variable is initialized in B Class";
    }
}