Add Items on JList using JTextField

Output:

Code:

/**

 * File: jtextfieldToJList.java

 * Tiltle: Add Items on JList using JTextField

 * Author: http://java-code-complete.blogspot.com

 */

 

//Java Extension Packages

import javax.swing.*;

//Java Core Packages

import java.awt.*;

import java.awt.event.*;



public class jtextfieldToJList extends JFrame {

 

 //Initializing JTextField, JList, and DefaultListModel class

 private DefaultListModel model;

 private JList list;

 private JTextField input;



 //Setting up GUI

 public jtextfieldToJList() {



 //Setting up the Title of the Window

 super("Add Item on JList using JTextField");



 //Set Size of the Window (WIDTH, HEIGHT)

 setSize(280,170);



 //Exit Property of the Window

 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



 //Constructing JTextField, JList, and DefaultListModel

 model = new DefaultListModel();

 input = new JTextField("Type your Inputs Here and Press Enter");

 list = new JList(model);



 //Setting JList Properties

 list.setVisibleRowCount(8);  //Number of Itmes to be displayed. If greater than 8, Vertical ScrollBar will be displayed.

 list.setFixedCellHeight(15); //Fix width of the JList

 list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);



 //Setting up the container ready for the components to be added.

    Container pane = getContentPane();

    setContentPane(pane);



 //Implemeting Even-Listener on JTextField's reference name "input" using ActionListener

 input.addActionListener(

  new ActionListener() {

   

   //Handle JTextField event if Enter key is pressed

   public void actionPerformed(ActionEvent event) {

    

    //Store the input from JTextField to the variable "message"

    String message = "The input <"+input.getText()+"> is Successfully Added!";

    

    //Adding items or elements from JTextField to JList

    model.addElement(input.getText());

    

    //Display the input from JTextField to JOptionPane using the variable "message"

    JOptionPane.showMessageDialog(null, message,"Successfully Added!",JOptionPane.INFORMATION_MESSAGE);

    

    //The JTextField will be empty after JOptionPane is closed ready for the next input.

    input.setText(null);

   }

  }

  );



 //Adding JTextField in the container with a BorderLayout of NORTH

 pane.add(input,BorderLayout.NORTH);



 //Adding the JList in the container with a component JScrollPane that's automatically creates Vertical and Horizontal Scroll Bar

 //if the items or elements are greater than the specified "VisibleRowCount" in line 38.

 pane.add(new JScrollPane(list),BorderLayout.SOUTH);

 

 /**Set all the Components Visible.

    * If it is set to "false", the components in the container will not be visible.

    */

 setVisible(true);

 }

 

 //Main Method

 public static void main(String[] args) {

  jtextfieldToJList aijl = new jtextfieldToJList();

 }

}

Important Part of the Program:

//Implemeting Even-Listener on JTextField's reference name "input" using ActionListener

 input.addActionListener(

  new ActionListener() {

   

   //Handle JTextField event if Enter key is pressed

   public void actionPerformed(ActionEvent event) {

    

    //Store the input from JTextField to the variable "message"

    String message = "The input <"+input.getText()+"> is Successfully Added!";

    

    //Adding items or elements from JTextField to JList

    model.addElement(input.getText());

    

    //Display the input from JTextField to JOptionPane using the variable "message"

    JOptionPane.showMessageDialog(null, message,"Successfully Added!",JOptionPane.INFORMATION_MESSAGE);

    

    //The JTextField will be empty after JOptionPane is closed ready for the next input.

    input.setText(null);

   }

  }

  );