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Have a play with this code:


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class TextValidation {

Does this need to check in real-time? When the user is typing/deleting text from the field or does it check when a button is pressed?

Why can't you use if/else?

Just to clarify, if the text is deleted out of the textfield, you want it to automatically update to 0?