How To Create Popup Window In Java

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Create Pop Window in Java

Create Pop Window in Java

Created: May-31, 2021 | Updated: October-12, 2021

Create Pop Up Window in Java Using JOptionPane
Create Pop Up Window in Java Using JDialog

Java allows us to create several types of GUI components using libraries like AWT, Swing and, JavaFX. In this tutorial, we're going to look at the dialog and learn how to create it. We will use two classes, JOptionPane and JDialog, in the following examples.

Create Pop Up Window in Java Using `JOptionPane`

The simplest way to create a Java pop up window or a dialog is to use the JOptionPane class as part of the javax.swing package, which comes with many useful methods. Some of the common techniques are listed below:

Method	Description
showMessageDialog()	Displays a message inside a specified frame
showInputDialog()	Get input from the user in the popup window
showConfirmDialog()	Shows the message and asks the user for confirmation like yes, no, or cancel

The following are the examples of the methods:

Example 1: Show a message inside a JFrame by creating a Jframe object, call the JOptionPane.showMessageDialog() method, and pass the first jFrame object as its first argument. The second argument is the message that we want to display in the dialog.

              import javax.swing.*;  public class PopUpJava {     public static void main(String[] args) {         JFrame jFrame = new JFrame();         JOptionPane.showMessageDialog(jFrame, "Hello there! How are you today?");     } }

Output:

java pop up window 1

Example 2: This example uses the JOptionPane.showInputDialog() function to show a message with an input field to get the input. Here, to store the input, we use a String variable and then show it to the user using showMessageDialog().

              import javax.swing.*;  public class PopUpJava {     public static void main(String[] args) {         JFrame jFrame = new JFrame();         String getMessage = JOptionPane.showInputDialog(jFrame, "Enter your message");          JOptionPane.showMessageDialog(jFrame, "Your message: "+getMessage);     } }

Output:

java pop up window 2

java pop up window 3

Example 3: We use the JOptionPane.showConfirmDialog() function to show a dialog with three buttons: Yes, No, and Cancel. Just like the other methods, we pass a jFrame object and a message to show. The showConfirmDialog() method returns an int that specifies the button that was clicked: 0 means Yes, 1 means No, and any other integer specifies that the cancel button was clicked.

              import javax.swing.*;  public class PopUpJava {     public static void main(String[] args) {         JFrame jFrame = new JFrame();         int result = JOptionPane.showConfirmDialog(jFrame, "Press any button to close the dialog.");          if (result == 0)             System.out.println("You pressed Yes");         else if (result == 1)             System.out.println("You pressed NO");         else             System.out.println("You pressed Cancel");      }  }

Output:

java pop up window 4

Create Pop Up Window in Java Using `JDialog`

In the second method, we use the Jdialog class. To create a frame, we need a jFrame object that is passed to the constructor of JDialog() as an argument when we create an object of JDialog and jd. Now we need to set the layout of the dialog that specifies how to place the components inside the dialog. We set the FlowLayout() function that arranges the components in a line using jd.setLayout().

To set the position and the size of the pop window, we use the setBounds() function, where the first two arguments are x and y positions, and the last two arguments are width and height.

We create a jLabel variable with the text message passed inside the constructor to show a text. To enable the user to close the dialog, we create a JButton object with the text Close. Now, we have to set the action to perform when the close button is clicked. To do that, we call the addActionListener() function that overrides the actionPerformed() method in which we specify the action to be performed.

At last, we add all the components or objects that we created using jd.add().

              import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;  public class PopUpJava {     public static void main(String[] args) {         JFrame jFrame = new JFrame();          JDialog jd = new JDialog(jFrame);          jd.setLayout(new FlowLayout());          jd.setBounds(500, 300, 400, 300);          JLabel jLabel = new JLabel("Press close button to close the dialog.");                  JButton jButton = new JButton("Close");         jButton.addActionListener(new ActionListener() {             @Override             public void actionPerformed(ActionEvent e) {                 jd.setVisible(false);             }         });          jd.add(jLabel);         jd.add(jButton);         jd.setVisible(true);     } }

Output:

java pop up window 5

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