Cannot add/ subtract/ multiply/ divide two numbers from two textfields

Question

When I run this it will display the two inputs together. For example 1 + 2 will come out to 12. I know that this string has to somehow be changed to an integer but I am lost on how to do so. Any help is greatly appreciated.

private void     
jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                           
jLabel1.setText (String.valueOf(jTextField1.getText() +
jTextField2.getText()));

Arqan · Accepted Answer · 2017-02-22T09:28:18.947

2

Values from JTextFields are Strings. If you want to do arithmetic on them you have to cast them to appropriate Numeric type like Integer or Double.

jLabel1.setText(String.valueOf(Integer.parseInt(jTextField1.getText()) + Integer.parseInt(jTextField2.getText())));

edited Feb 22 '17 at 09:28

answered Feb 21 '17 at 16:07

Arqan

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`setText()` method expects a `String` argument, not an `int`. You need to convert `int` to `String` inside parenthesis. – Yousaf Feb 21 '17 at 18:30

score 0 · Answer 2 · answered Feb 21 '17 at 16:11

I know that this string has to somehow be changed to an integer but I am lost on how to do so.

You are right. That's indeed the problem. Extracting a string number to int is very easy to achieve using Integer.parseInt method.

private void     
jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                           
jLabel1.setText (String.valueOf(Integer.parseInt(jTextField1.getText()) +
Initeger.parseInt(jTextField2.getText())));

Cannot add/ subtract/ multiply/ divide two numbers from two textfields

2 Answers2