Null pointer exeption (simple java???)?

Question

ok here is my program. its just supposed to display a name adn then output it...
public class testing {

static Library myLib;

public static void main(String[] args) {

//local variables
String PlayerName;

System.out.println("Please State your Player name");
PlayerName = Keyboard.readString();

myLib.clrscr();
System.out.println("this is your name" + PlayerName);


//End
}

}
here is my keyboard class
http://www.frag-gaming.com/download/Keyboard.class

and here is the error im getting
http://www.frag-gaming.com/download/myerror.jpg

any help?

Answer 1

The variable, myLib is a class variable so it is automatically set to null.



In line 13, the Java program tries to dereference the variable, myLib which is null.



I think what the solution is that before line 13, you need to assign a Library object to the object reference variable, myLib.

Answer 2

The .class file is the compiled file, so I can't evaluate the code in the keyboard class, but it clearly isn't reading from the keyboard properly. Also make sure that you're returning the String value in the readString() method.

Answer 3

Hi. I can decompile your class. But what's Library?

When I had removed the myLib.clrscr(), it works properly.

Answer 4

myLib.clrscr();



Remove this and just give it a try