Why do I have a NullPointerException?
Let’s learn why do I have a NullPointerException. The most accurate or helpful solution is served by Stack Overflow.
There are ten answers to this question.
Best solution
I get a run-time error NullPointerException whenever I try to click the options button on my JFrame. The JFrame is CharSelection(), and I want to disable it so that I can't click anything on that JFrame and have to click the back button to enable it again. This is the code for the button. JButton btnOptions = new JButton("Options"); btnOptions.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { CharSelection.disabled(); GameMenu.getMusicOption().setVisible...
Answer:
You do not instantiate the frame really. There's a frame = new JFrame() missing somewhere. Plus to do...
Frosty at Stack Overflow Mark as irrelevant Undo
Other solutions
I'm fairly new to android programming and I don't understand why I am getting this error. Here is part of the logcat: 03-26 20:41:37.196: ERROR/AndroidRuntime(8250): FATAL EXCEPTION: main 03-26 20:41:37.196: ERROR/AndroidRuntime(8250): java.lang.RuntimeException...
Answer:
I also just started with android so I can't be 100% sure, but it seems you need to create an object...
Reese Pratt at Yahoo! Answers Mark as irrelevant Undo
Exception in thread "main" java.lang.NullPointerException at University.offerCourse(University.java:4… at StudentCourseTestProgram.main(StudentCou… Process completed. line 40 public void offerCourse(Course c){ courses.add(c);...
Answer:
You probably haven't initialized cu yet. So, the new operator hasn't been called to create the object...
Larry Joma at Yahoo! Answers Mark as irrelevant Undo
Hi guys, I am involved in a project which I have to scrape data from the internet I currently have three main classes called TripAdvisorXpath, DOMParser and IValueExtractor, running in three different packages the problem is when running the class called...
Answer:
If you are using Eclipse, the debugger should show you where the error is happening. If it isn't happening...
Just Me at Yahoo! Answers Mark as irrelevant Undo
These are the two files: import java.util.Random; public class Game { int aGoals; int bGoals; Team a; Team b; boolean overtimeWin; public Game(Team aTeam, Team bTeam) { a = a; b = b; Random r = new Random(); double c = -1; double d = -1; while(c <...
Answer:
Here is your problem: Team a; //by default the value of a = null, as Team b; //same as a. boolean overtimeWin...
Anta Fe at Yahoo! Answers Mark as irrelevant Undo
I've posted the code and more information here: http://stackoverflow.com/questions/10126… If someone knows what I have done wrong and could tell me, I'd greatly appreciate it.
Answer:
This could be the technical issue.. Report it to the service to get things fixed... Good luck!
Reese Pratt at Yahoo! Answers Mark as irrelevant Undo
Answer:
Pointers are used in Java implementation for references (Oracle JDK is implemented in C++) who develop...
Sasanka Pradhan at Quora Mark as irrelevant Undo
Here's the code I have and it is giving a very stupid error! any idea why? public class Main { public Main() { allStudents = new Stu[1]; ...show more
Answer:
We have to allocate the memory individual elements of the array. If you give that no more errors will...
ZGVZWGAVNU7KZALKLQDWDPPNNQ at Yahoo! Answers Mark as irrelevant Undo
Answer:
A NullPointerException is an exception thrown by the Java Virtual Machine when you try to access a variable...
wiki.answers.com Mark as irrelevant Undo
Answer:
This error is corrupt software. Be sure to make a backup of data and pull the battery from the phone...
Anonymous at ChaCha Mark as irrelevant Undo
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