Apparently txtMonth is a JTexfield, but the Double.parseDouble method receives a String. Check the method's javadoc here. Try using: double Amount = Double.parseDouble(txtMonth.getText()); Also, this method will throw a NumberFormatException if the text can't be converted to double.

Nov 15, 2018 · Best practice would be to put a try catch block around where you call parseDouble. If you get a ParseException here, you can / should show a message to the user saying that they haven't entered a valid number in this field. price is a primitive type of double - it is not an object. So you cannot perform an operation like .xxx() on it.

Dec 2, 2013 · To do this, use the parseDouble method: This returns type double (primitive), whereas valueOf returns type of the class Double. EDIT: As Ingo mentioned, you should make sure you take care of the NumberFormatExceptions that occur when you try to parse an invalid string (eg: "Hello123") into a number.

Dec 3, 2021 · JTextField(Document doc, String text, int columns): constructor that creates a textfield that uses the given text storage model and the given number of columns. Methods of the JTextField are: setColumns(int n) :set the number of columns of the text field.

Jul 6, 2019 · JTextField is a fundamental Swing’s component that allows users editing a single line of text. This article lists common practices when using JTextField in Swing development. Table of content: Creating a JTextField object; Adding the text field to a container; Getting or setting content of the text field; Setting tooltip text; Setting input focus

Because the JTextField class inherits from the JTextComponent class, text fields are very flexible and can be customized almost any way you like. For example, you can add a document listener or a document filter to be notified when the text changes, and in the filter case you can modify the text field accordingly.

The following tutorial shows you how to use: The method getDoubleFromJTextField () has the following parameters: import javax.swing.*; public class Main { /**/* w w w. d e m o2 s . c om */ . * gets a double from a JTextField and checks that it is a double. * @param textField the JTextField from which the double taken.

Nov 7, 2000 · You could use this techinique in conjunction with what you're doing: import java.io.*; import java.util.*; import javax.swing.*; import javax.swing.text.*; import java.text.*; import java.awt.event.*; import java.awt.*; public class DecimalTextField extends JFrame { public static void main(String[] args){ new DecimalTextField(); } public ...

Oct 24, 2024 · JTextField is a Swing component in Java that allows users to input single-line text. It is essentially a blank space where users can type characters. It is commonly used in GUI (Graphical User Interface) applications to accept textual input from users.

Sep 2, 2014 · The java.lang.Double.parseDouble() method returns a new double initialized to the value represented by the specified String, as done by the valueOf method of class Double. For example: