java - Why isn't there a JTextField being displayed here? - 


public class wasd extends jframe{ ellipse2d.double ball; int ballx = 100; int bally = 100; static jtextfield typingarea; public static void main(string[] args){      javax.swing.swingutilities.invokelater(new runnable() {         public void run() {             createandshowgui();         }     }); } private static void createandshowgui(){     wasd frame = new wasd("frame");     frame.setdefaultcloseoperation(exit_on_close);      frame.addcomponentstopane();      frame.pack();     frame.setvisible(true); } private void addcomponentstopane(){     typingarea = new jtextfield(20);     //typingarea.addkeylistener(this); } public wasd(string name){     super(name); } }

when run program empty window. jtextfield doesn't show up. thanks!

(apparently post has code, i'm adding make let me submit. ignore sentence , previous one.)

the jtextfield needs added frame after created.

private void addcomponentstopane(){     typingarea = new jtextfield(20);     frame.add(typingarea); }

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