Pernontas apef8ias to text tou TextField

[hadjici2]

Exo ena TextField, kai molis grafi kati o user to 8elo na emfanizete se ena label apef8ias, xoris na xriazete na patisi kapio koumpi. Diladi ka8e gramma pou grafi sto TextField na emfanizete apefthias sto label. Kamia idea?

[hadjici2]

Apla ta grafo....

 

TextField measurementFieldX = new TextField();

measurementFieldX.addActionListener(this);

 

kai meta sto public void actionPerformed(ActionEvent e) grafo

 

System.out.println(measurementFieldX.getText());

 

kai telika perno auta:

java.lang.NullPointerException

at Order.actionPerformed(Order.java:185)

at java.awt.Button.processActionEvent(Button.java:381)

at java.awt.Button.processEvent(Button.java:350)

at java.awt.Component.dispatchEventImpl(Component.java:3527)

at java.awt.Component.dispatchEvent(Component.java:3368)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh

read.java:191)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre

ad.java:144)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)

 

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)

 

at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)

 

Ti ginete re pedia? Ti kano lathos?

[nucleus]

ορίστε κατευθείαν από το Java Tutorial

 

http://java.sun.com/docs/books/tutorial/post1.0/ui/keylistener.html