Which class makes it easy to pop up a standard dialog box that prompts users for a value or informs them of something?

Asked By: Yongsheng Eisenschenk | Last Updated: 9th February, 2020
Category: technology and computing programming languages
3.9/5 (156 Views . 25 Votes)
Class JOptionPane. JOptionPane makes it easy to pop up a standard dialog box that prompts users for a value or informs them of something. For information about using JOptionPane , see How to Make Dialogs, a section in The Java Tutorial.

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Furthermore, what is J option?

Java JOptionPane. The JOptionPane class is used to provide standard dialog boxes such as message dialog box, confirm dialog box and input dialog box. These dialog boxes are used to display information or get input from the user. The JOptionPane class inherits JComponent class.

Beside above, what is the return type from invoking JOptionPane showInputDialog () method? 2 Answers. JOptionPane. showInputDialog() will return the string the user has entered if the user hits ok, and returns null otherwise. Therefore, you can just check to see if the resultant string is null .

Also Know, how do you use JOptionPane showMessageDialog?

The first thing to do is to reference the library we want to use:

  1. import javax.
  2. To get an input box that the user can type into, we can use the showInputDialog method of JOptionPane.
  3. String first_name;
  4. Double click showInputDialog.
  5. String family_name;
  6. String full_name;
  7. JOptionPane.showMessageDialog( null, full_name );

How do I change the icon on JOptionPane?

The method you're using doesn't specify an icon. You should use showConfirmDialog(Component, Object, String, int , int , Icon) , which enables you to pass an Icon as well. To Have no Icon, try this. String[] options = {"Ok", "Cancel"}; int choices = JOptionPane.

23 Related Question Answers Found

How do you make a JOptionPane?

Creating a JOptionPane : JOptionPane Dialog « Swing « Java
  1. Display a message (through the use of the showMessageDialog method)
  2. Ask for user's confirmation (using the showConfirmDialog method)
  3. Obtain the user's input (using the showInputDialog method)
  4. Do the combined three above (using the showOptionDialog method)

What is JFrame in swing?

JFrame is a class of javax. swing package extended by java. awt. frame, it adds support for JFC/SWING component architecture. It is the top level window, with border and a title bar.

What is null in JOptionPane Showmessagedialog?

Passing null to it just indicates that there's not an associated "parent" dialog - ie, the dialog being displayed does not belong to another dialog. Instead, you can use the overloaded signature and call it like this: showInputDialog(Object message)

What are the different types of dialog available in Java?

There are 3 types of dialog boxes: modeless, modal, and system modal. Modal dialog boxes are generally used inside a program, to display messages, and to set program parameters.

What is meant by Swing in Java?

Swing is a set of program component s for Java programmers that provide the ability to create graphical user interface ( GUI ) components, such as buttons and scroll bars, that are independent of the windowing system for specific operating system . Swing components are used with the Java Foundation Classes ( JFC ).

What kind of data type does the JOptionPane showInputDialog method return?

Input Dialog
The JOptionPane's showInputDialog method always returns the user's input as a String. String containing a number, such as "15", can be converted to a numeric data type. Each of the numeric wrapper classes (discussed later), has a parse method that converts a string to a number.

What is showInputDialog in Java?

showInputDialog(Component parentComponent, Object message, String title, int messageType) Shows a dialog requesting input from the user parented to parentComponent with the dialog having the title title and message type messageType . static Object.

What is JDialog?

JDialog is a part Java swing package. The main purpose of the dialog is to add components to it. JDialog(Dialog o, String s) : creates an empty dialog with a specified dialog as its owner and specified title.

How do you close a JFrame?

EXIT_ON_CLOSE (defined in JFrame) : Exit the application using the System exit method. Use this only in applications. might still be useful: You can use setVisible(false) on your JFrame if you want to display the same frame again. Otherwise call dispose() to remove all of the native screen resources.

What is null in Java?

In Java, null is a "placeholder" value that - as so many before me have noted - means that the object reference in question doesn't actually have a value. Void, isn't null, but it does mean nothing. In the sense that a function that "returns" void doesn't return any value, not even null.

How do I import a Java Util scanner?

Example 3
  1. import java.util.*;
  2. public class ScannerClassExample2 {
  3. public static void main(String args[]){
  4. String str = "Hello/This is JavaTpoint/My name is Abhishek.";
  5. //Create scanner with the specified String Object.
  6. Scanner scanner = new Scanner(str);
  7. System.out.println("Boolean Result: "+scanner.hasNextBoolean());

How do you input in Java?

Example 5: Get Integer Input From the User
  1. import java. Scanner;
  2. class Input {
  3. public static void main(String[] args) {
  4. Scanner input = new Scanner(System. in);
  5. print("Enter an integer: ");
  6. int number = input. nextInt();
  7. println("You entered " + number);
  8. }

What is javax swing JOptionPane?

javax.swing.JOptionPane. The Java API class javax. swing. JOptionPane has facilities for creating a dialog box that can appear on the computer's desktop to request input from or display messages to the user.