How to delete a specific digit from a number written on JLabel in JAVA?

Question

If i have written a number on a JLabel in java, how can I delete a specific digit from it? Is there any option by which I can get the current Cursor position or set it as required and then delete a particular digit of my choice? Kindly help...

Answer 1

Just delete the last char of the labels text, which is a String, if you are not sure if that String can be null in some cases, catch a NullpointerException.

But always ensure, that the text is not empty when you call substring to prevent a IndexOutOfBoundException:

String text = jLabelObject.getText();
try{
    if(!text.isEmpty()){
        jLabelObject.setText(text.substring(0, text.length()-1);
    }
}catch(NullPointerException e){
    jLabelObject.setText("");
}

Please take a look at the Java API Doc

1. substring(), isEmpty(), length()String
2. setText() JLabel

Answer 2

You say you want to delete the last digit:

String txt = jLabel.getText();
jLabel.setText(txt.substring(0, txt.length()-1));

This should do the trick.

Edit:

You should also check for null or empty text:

String txt = jLabel.getText();
if(txt != null && !txt.isEmpty()) {
    jLabel.setText(txt.substring(0, txt.length()-1));
}