How do I create an if statement in Java that throws an error if the sum of two text fields is greater than another textfield

Question

I am pretty new to Java and I have three text fields which are all integers in my Java project. I want to create an if statement that throws an error if the sum of values in text field 1 and 2 are greater than textfield 3. This is what I was able to come up with

if (text3.getText() > (text1.getText()+text2.getText())){
    System.out.println(“Error”)
}

Do I need to put it in a try and catch statement?

https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps/What_is_JavaScript — Mister Jojo, Aug 03 '21 at 01:30
Does this answer your question? [How does compareTo work?](https://stackoverflow.com/questions/32443402/how-does-compareto-work) — Olaf Kock, Aug 03 '21 at 07:07
Hint: you should almost certainly be parsing those strings into integers, otherwise the addition and comparison won't make much sense. — Jon Skeet, Aug 03 '21 at 07:14

TravisF · Answer 1 · 2021-08-03T04:21:23.623

0

You can create yourself a new Exception Class:

public class NumberExceededException extends Exception {
    public NumberExceededException(String exceptionMessage){
        super(exceptionMessage);
    }
}

Then use it with:

If (text3.getText() > (text1.getText()+text2.getText())) {
    throw new NumberExceededException("You have exceeded my expectations");
}

This will throw a new bubbling exception which can be caught by a try catch higher up.

Just to note that this is not exclusive to Netbeans it is a Java function, Netbeans is an IDE and only outputs whatever the JVM tells it to output.

edited Aug 03 '21 at 04:21

answered Aug 03 '21 at 01:52

TravisF

459
6
13

I got an error when I tried this: "public class NumberExceededException extends Exception { public NumberExceededException(String exceptionMessage){ super(exceptionMessage); } } try{ If (Container_Num.getText() > (size20.getText()+size40.getText())){ throw new NumberExceededException("You have exceeded it"); } catch (NumberExceededException ex) { java.util.logging.Logger.getLogger(Integral_F.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } }" – Kwadwo Sarpong Kyei Aug 03 '21 at 04:14
If you are going to use a nested class it has to be inside the java class but not inside a method. I would recommend however making the exception its own java file then importing it and using it that way, it's better than nesting classes. – TravisF Aug 03 '21 at 04:24

How do I create an if statement in Java that throws an error if the sum of two text fields is greater than another textfield

1 Answers1