A textbox class only accept integers in Java

Question

I just want to do a textbox class only accepts integers..

I have done something, but ı think it's not enough.

Can anyone help me, please? Thanks...

import java.awt.TextField
public class textbox extends TextField{
    private int value;

    public textbox(){
        super();

    }

    public textbox(int value){
        setDeger(value);
    }

    public int getValue() {
        return value;
    }

    public void setValue(int value) {

        this.value = value;
    }
}

Answer 1

Why are you using a TextField? Why don't you learn Swing instead of AWT, then you can use a JTextField. Actually you can use a JFormattedTextField which support this requirement. Read the API and follow the link to the tutorial for examples.

Answer 2

I think you are missing the point here's a hint, with your code i can still call textfield.setText("i'm not a number");

Answer 3

Since you must use TextArea, you might have some success with a TextListener. Add a listener that restricts the characters entered to just numbers.

In pseudo code the event method could do this:

1. get event source
2. determine current cursor position
3. if the character at the current position is not valid input, then
   1. remove the bad character
   2. reset the text in the field

This is easier to do with a JTextField as you can replace the document model or just use a JFormattedTextField.

Answer 4

try looking into overriding methods