1) java.awt.textfield version, I really can't think of other ways, this approach is relatively bad:
Public void setInputLimited (int min, int max textfield text) {
T.AddKeylistener (new java.awt.event.keyadapter () {public void keypressed (keyevent e) {if (E.GetKeyCode ()> max || E.GetKeyCode ()
T.SETTEXT (T. Gettext (). Substring (0, T. Gettext (). Length () -1));
}
}
});
}
2) javax.swing.jtextfield
JtextField and TextField are different. He has a setDocument (Document Doc) method that can set your input.
Such as
Import java.awt. *; import javax.swing.text. *;
Public void setInputLimited (int min, int max, jtextfield text) {
Text.SetDocument (new numberonlydocument ());
}
public class NumberOnlyDocument extends PlainDocument {private boolean haveDot = false; private int length = 0; private double max = Double.MIN_VALUE, min = Double.MAX_VALUE; public NumberOnlyDocument (double max, double min) {if (max> = min) { this.max = max; this.min = min;}} public void insertString (int offs, String str, AttributeSet a) throws BadLocationException {if (str == null) {return;} char [] number = str.toCharArray ( ); For (int i = 0; i
