JComboBox Component in Java

Submitted by donbermoy on Friday, November 14, 2014 - 08:08.

This is a tutorial in which we will going to create a program that has the JComboBox component/control using Java. So, now let's start this tutorial! 1. Open JCreator or NetBeans and make a java program with a file name of jComboBoxComponent.java. 2. Import the following packages:

import java.awt.*; //used to access the flowlayout
import javax.swing.*; //used to access the JFrame and JComboBox class

3. The jComboBoxComponent classname must extends the JFrame to have the container of the components used. Have also the following variables for the JComboBox below:

         String days[] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"}; //string array of days to be added to combobox
         JComboBox cbo = new JComboBox(days); //instantiate a combobox which contains the value of days variable from the string array

We have created a String array of days to be added to the combobox. 4. Now, create a constructor to add the JComboBox to the frame as well as its layout and visibility. Another way of adding items to the ComboBox is to have the addItem method. As you can see the String array of days variable above has only Monday to Friday. To add another item, have this code below:

    cbo.addItem("Saturday"); // add the value of Saturday to the combobox
    cbo.addItem("Sunday"); // add the value of Sunday to the combobox

Add the JComboBox to the frame using the add method and have it with the flowlayout layout of the frame.

    getContentPane().add(cbo); //add the combobox to JFrame
    getContentPane().setLayout(new FlowLayout()); // have FlowLayout of JFrame 

Then pack the frame so that the component/control will be seen directly to the frame. Also set its visibility to true and have it the close operation to exit.

    pack(); //pack the frame
    setVisible(true); //set visibility to true
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //exit after clicking the close button

Output:

Here's the full code of this tutorial:

import java.awt.*; //used to access the flowlayout
import javax.swing.*; //used to access the JFrame and JComboBox class
 
public class jComboBoxComponent extends JFrame {
        
         String days[] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"}; //string array of days to be added to combobox
         JComboBox cbo = new JComboBox(days); //instantiate a combobox which contains the value of days variable from the string array
 
     public jComboBoxComponent() { //constructor
    
 
    cbo.addItem("Saturday"); // add the value of Saturday to the combobox
    cbo.addItem("Sunday"); // add the value of Sunday to the combobox
 
    getContentPane().add(cbo); //add the combobox to JFrame
    getContentPane().setLayout(new FlowLayout()); // have FlowLayout of JFrame 
    pack(); //pack the frame
    setVisible(true); //set visibility to true
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //exit after clicking the close button
  }
 
  public static void main(String arg[]) {
    new jComboBoxComponent(); //call the constructor
  }
}

For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below. Best Regards, Engr. Lyndon Bermoy IT Instructor/System Developer/Android Developer/Freelance Programmer Mobile: 09488225971 Landline: 826-9296 E-mail:[email protected] Add and Follow me on Facebook: https://www.facebook.com/donzzsky Visit and like my page on Facebook at: https://www.facebook.com/BermzISware

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