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// KeyTest.java
import java.awt.*;
import java.awt.event.*;
class KeyTest extends Frame
{
TextField ta;
KeyTest() {
ta = new TextField();
add("Center", ta);
ta.addKeyListener( new KeyAdapter() {
public void keyTyped(KeyEvent ke) {
char c=ke.getKeyChar();
if (c<'0' || c>'9')
ke.consume();
}
}
);
}
public static void main(String[] args)
{
KeyTest f = new KeyTest();
f.setSize(100, 50);
f.setVisible(true);
}
}