Java Swing GUI Try/Catch Block

Question

I\'m just learning Java exception handling and Java in general. I\'ve made a Swing GUI where the user will enter integers into two fields and then click a radio button with an

Answer 1

You'll get exception if you won't check your every event method, so you can do something like that to solve it,

private void aRadioButtonActionPerformed(ActionEvent evt) {
    String a = aTextField.getText();
    String b = bTextField.getText();



    // you may get empty string here so check if the texbox is empty ?
 int i=0,j=0;

        try{

    if(a.length()>0 || b.length()>0){
         i = Integer.parseInt(a);
         j = Integer.parseInt(b);
    }else{
        if(a.length()<1 && b.length()>0){

            i = Integer.parseInt(a);
        }else{
            if(b.length()<1 && a.length()>0)
            j = Integer.parseInt(b);
        }
    }


    int k = i + j;
        }catch(Exception e){
          System.out.println("Exception:"+e);
          }
    cTextField.setText(Integer.toString(k));
}

do the same thing for you -,*,/ radio button listeners too