Calculator in Java, how to make a backspace button?

Question

Java

How to make a BackSpace button in a graphing calculator?

private void buttonBackspaceActionPerformed(java.awt.event.ActionEvent evt) {                                                
             String t = textField.getText();
            
             if (t.isEmpty()){
                   textField.setText("0");
             } else {
                  textField.setText(t.substring(0, t.length() - 1));  
             }
    }

But this code of mine, when you delete all the numbers, first gives out 0, when you press it again, it gives an empty string, and so on.

Answer 1

if (t.isEmpty() || t.getText().equals("0")){
PS Do you want a cross-platform calculator? If not, then why in Java?

Answer 2

But this code of mine, when you delete all the numbers, first gives out 0, when you press it again, it gives an empty string, and so on.

well, if you use backspace on an "empty" field, then it should be so, you ask if the field is "empty", then make it 0. And if you click again, then it is no longer empty, and the else is called, where you cut 0 and the field becomes empty again. In theory, with this code - it should work as I described above))
try to add if (t.isEmpty() || t.getText() == "0")
maybe I'm already sleeping and stupid, then I'm sorry xD