How to clear after calculation JButtons

Question

I wrote a calculator, but the way i concatenate my numbers is so bad because after calculation lets say "5 + 2" when i press equal button it gives "7", the problem comes when i want to do another calculation lets say "6+1" it doesn't do it this way when i press 6 button it gives "76+1" i.e concatenating my result with the new calculation, i tried to fix it but i couldn't without disrupting another functionality. Below is part of the code.

private void NineActionPerformed(java.awt.event.ActionEvent evt) {                                     
    // TODO add your handling code here:
    TextField.setText(TextField.getText()+"9");
}                                    

private void OneActionPerformed(java.awt.event.ActionEvent evt) {                                    
    // TODO add your handling code here:
    TextField.setText(TextField.getText()+"1");
}                                   

private void TwoActionPerformed(java.awt.event.ActionEvent evt) {                                    
    // TODO add your handling code here:
    TextField.setText(TextField.getText()+"2");
}                                   

private void ThreeActionPerformed(java.awt.event.ActionEvent evt) {                                      
    // TODO add your handling code here:
    TextField.setText(TextField.getText()+"3");
}                                     

private void FourActionPerformed(java.awt.event.ActionEvent evt) {                                     
    // TODO add your handling code here:
    TextField.setText(TextField.getText()+"4");
}                                    

private void FiveActionPerformed(java.awt.event.ActionEvent evt) {                                     
    // TODO add your handling code here:
    TextField.setText(TextField.getText()+"5");
}                                    

Answer 1

Most simple solution : add clear button and on press clear the text.

The typical solution.:

do something like this:

onequalbuttonclick [your equal button action function] 
set equalPress=true;

in other functions do something like this

    private void NineActionPerformed(java.awt.event.ActionEvent evt) {                                     
if(equalPress){        
textField.setText(9);
equalPress=false;

    }
else
textField.setText((Integer.parseInt(TextField.getText()) + 9));
} 

Comment on your code: Instead of these functions just add one actionPerformed event in your class. and then you can use the getSource() method to find the button clicked.