key handler problems

[Azoth]

Here is my code:

 =jtextfield1.addKeyListener(new KeyAdapter(){
                  @Override
                  public void keyPressed(KeyEvent e)
                  {
                      if (e.getKeyCode()==KeyEvent.VK_ENTER)
                      {   jtextfield1.getText();
                        JOptionPane.showMessageDialog(null,null,"Success",JOptionPane.INFORMATION_MESSAGE);
                     }
)};
}

I am getting these errors

java.lang.ClassFormatError: Invalid superclass index 0 in class file MycologyFrame
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)
Error: A JNI error has occurred, please check your installation and try again

I have the proper imports in there too. I basically followed a youtube on it and mine isn't working . I don't know why ? Help

[Norm]

Why do you think the error is related to the posted code?
How are you using JNI?

[Azoth]

Why do you think the error is related to the posted code?
How are you using JNI?

When I remove the key handler my program run just fine.

[Norm]

I have no idea why that code would cause an exception.
What happens if the JOptionPane statement is removed?

What is the = that is shown in the posted code:
=jtextfield1.addKeyListener(new KeyAdapter(){

[Azoth]

I have no idea why that code would cause an exception.
What happens if the JOptionPane statement is removed?

What is the = that is shown in the posted code:
=jtextfield1.addKeyListener(new KeyAdapter(){

Typo

[Norm]

Does the code compile without errors?
Are you trying to run the code with compiler errors?

[Azoth]

Does the code compile without errors?
Are you trying to run the code with compiler errors?

I removed the Popup window and put in a System.out.println("success") but
upon running it printed nothing.

I tried something like this
Class appname extends jframe implements keyHandler{
I get the error class appname not abstract ?

[Norm]

it printed nothing.

That means the code was not executed.
Is the keyPressed method called? Add a print statement to show if it was called and what the value of the passed key code was.

[Azoth]

That means the code was not executed.
Is the keyPressed method called? Add a print statement to show if it was called and what the value of the passed key code was.

Pressing enter should call it. How do do I call it?

[Norm]

Can you make a small, simple program for testing that shows the problem?

[Azoth]

Problem solved.i had to change keyevent e to java.awt.event.KeyEvent in the parameter. It then recognized the
getKeyCode() method. Before it stated it could not find the symbol.

[Norm]

it could not find the symbol.

When you get compiler errors, you MUST fix them before trying to execute the code.

It's a waste of time posting short pieces of code without also posting the error messages it has.