{"id":23138,"date":"2015-05-12T11:00:34","date_gmt":"2015-05-12T08:00:34","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=23138"},"modified":"2015-06-06T17:02:07","modified_gmt":"2015-06-06T14:02:07","slug":"java-jlist-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/java-development\/desktop-java\/swing\/jlist\/java-jlist-example\/","title":{"rendered":"Java JList Example"},"content":{"rendered":"

In this example we are going to demonstrate how to use Java Swing JList<\/a><\/code>, JList<\/a><\/code>\u00a0is a Swing component with which we can display a list of elements. This component also allows the user to select one or more elements visually. This article shows how to work with\u00a0JList<\/a><\/code> features using a simple example where we build a GUI with a\u00a0JList<\/a><\/code> to show a list of employee names and let us add\/remove a single name to\/from the\u00a0JList<\/a><\/code> dynamically.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

1. Swing JList:<\/h2>\n

We create a custom\u00a0JList<\/a><\/code> SwingJList.java<\/code> where we can initialize the data model, customize the selection mode and enable scrolling.<\/p>\n

    \n
  1. \n

    JList Data Model:<\/h4>\n

    As with other Swing components, the data for a\u00a0JList<\/a><\/code> is held in a model. This is represented by ListModel<\/a><\/code> interface in the Swing API. The API provides a default implementation of this class named DefaultListModel<\/a><\/code>. So, We create an instance of the\u00a0DefaultListModel<\/a><\/code> class by declaring it as accepting T<\/code>\u00a0as a parameterized raw type using Java Generics. Also, we added two additional methods addElement(T element)<\/code> and removeElement(T element)<\/code> which implicitly use\u00a0add<\/a><\/span>(int\u00a0index, E<\/a>\u00a0element)<\/code> and\u00a0removeElement<\/a><\/span>(Object<\/a>\u00a0obj)<\/code> to let us add\/remove elements to\/from the\u00a0JList<\/a><\/code> model.<\/p>\n

    public SwingJList(List<T> listData) {\r\n\t\/\/ Create a JList data model\r\n\tsuper(new DefaultListModel<T>());\r\n\tlistData.forEach(element -> addElement(element));\r\n}\r\n\r\npublic void addElement(T element) {\r\n\t((DefaultListModel<T>) getModel()).add(Constants.NEW_ELEMENT_IDX,\r\n\t\t\t\telement);\r\n}\r\n\r\npublic void removeElement(Object element) {\r\n\t((DefaultListModel<T>) getModel()).removeElement(element);\r\n}\r\n<\/pre>\n<\/li>\n
  2. \n
    JList Selection Mode:<\/h4>\n
    The\u00a0JList<\/a><\/code> selection mode defines the way elements can be selected,\u00a0JList<\/a><\/code> uses an instance of ListSelectionModel<\/a><\/code> to manage its selection. By default, a\u00a0JList<\/a><\/code> selection model is MULTIPLE_INTERVAL_SELECTION<\/a><\/code> but we\u00a0can specify a different selection mode by calling the setSelectionMode<\/a><\/code> method on the\u00a0JList<\/a><\/code>. There are totally 3 selection modes available to be set for the\u00a0JList<\/a><\/code>:<\/p>\n
      \n
    1. Single Selection Mode<\/span>:
      \nThis mode specifies that only a single item can be selected at any point of time, we can activate this mode as the following:<\/p>\n
      setSelectionMode(ListSelectionModel.SINGLE_SELECTION);\r\n<\/pre>\n
      \"Figure<\/a>
      Figure 1: Single Selection Mode<\/figcaption><\/figure><\/li>\n
    2. Single Interval Selection Mode<\/span>:
      \nThis mode specifies that multiple items can be selected, but they have to be contiguous. Items can be selected contiguously by pressing down the shift key and selecting elements with the mouse, we can activate this mode as the following:<\/p>\n
      setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);\r\n<\/pre>\n
      \"Figure<\/a>
      Figure 2: Single Interval Selection Mode<\/figcaption><\/figure><\/li>\n
    3. Multiple Interval Selection Mode<\/span>:
      \nThis mode is the default mode. This mode specifies that multiple items can be selected and they may or may not be contiguous, we can activate this mode as the following:
       
      <\/div> <\/div><\/p>\n
      setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);\r\n<\/pre>\n
      \"Figure<\/a>
      Figure 3: Multiple Interval Selection Mode<\/figcaption><\/figure><\/li>\n<\/ol>\n<\/li>\n
    4. \n
      JList Scrolling:<\/h4>\n
      JList<\/a><\/code> doesn’t support scrolling directly. To create a scrolling\u00a0JList<\/a><\/code>, we have to add the\u00a0JList<\/a><\/code> to a JScrollPane<\/a><\/code>, as the following:<\/p>\n
      JScrollPane listScrollPane = new JScrollPane(simpleSwingJList);\r\n<\/pre>\n<\/li>\n<\/ol>\n
      SwingJList.java<\/span>:<\/em><\/p>\n
      package com.jcg;\r\n\r\nimport java.util.List;\r\n\r\nimport javax.swing.DefaultListModel;\r\nimport javax.swing.JList;\r\nimport javax.swing.ListSelectionModel;\r\n\r\n\/**\r\n * @author ashraf\r\n * @param <T>\r\n *\r\n *\/\r\n@SuppressWarnings(\"serial\")\r\npublic class SwingJList<T> extends JList<T> {\r\n\r\n\tpublic SwingJList(List<T> listData) {\r\n\r\n\t\t\/\/ Create a JList data model\r\n\t\tsuper(new DefaultListModel<T>());\r\n\r\n\t\tlistData.forEach(element -> addElement(element));\r\n\r\n\t\t\/\/ Set selection mode\r\n\t\tsetSelectionMode(ListSelectionModel.SINGLE_SELECTION);\r\n\r\n\t}\r\n\r\n\tpublic void addElement(T element) {\r\n\t\t((DefaultListModel<T>) getModel()).add(Constants.NEW_ELEMENT_IDX,\r\n\t\t\t\telement);\r\n\t}\r\n\r\n\tpublic void removeElement(Object element) {\r\n\t\t((DefaultListModel<T>) getModel()).removeElement(element);\r\n\t}\r\n\r\n}\r\n<\/pre>\n
      2. JList Selection Listener:<\/h2>\n
      The\u00a0ListSelectionListener<\/a><\/code> fires the event if the user selecting or deselecting an item. The below code registers a\u00a0ListSelectionListener<\/a><\/code> using the\u00a0addListSelectionListener<\/a><\/span>(ListSelectionListener<\/a>\u00a0listener)<\/code>\u00a0method. We use an anonymous inner class to implement the event listener interface. We implement the\u00a0valueChanged<\/a><\/span>(ListSelectionEvent<\/a>\u00a0e)<\/code> method. We call the handy method\u00a0getSelectedValue<\/a><\/span>()<\/code>\u00a0on the\u00a0JList<\/a><\/code> instance which returns the current selected employee name, we simply show it in the input text box.<\/p>\n
      swingJList.addListSelectionListener(new ListSelectionListener() {\r\n\t@Override\r\n\tpublic void valueChanged(ListSelectionEvent e) {\r\n\t\tif (!e.getValueIsAdjusting()) {\r\n\t\t\tString selectedName = swingJList.getSelectedValue();\r\n\t\t\tnameField.setText(selectedName);\r\n\t\t}\r\n\t}\r\n});\r\n<\/pre>\n
      3. Adding\/Removing JList Items:<\/h2>\n
      We add\/remove items to\/from the\u00a0JList<\/a><\/code> via Swing component event listeners, we just register an event listener to be notified when add or remove event happens. we create the following two ActionListener<\/a><\/code> where we add one on the addButton<\/code> and the other on the deleteButton<\/code> JButton<\/a><\/code>.<\/p>\n
        \n
      1. Add Action Listener<\/span>:
        \nWe create addButton<\/code>         JButton<\/a><\/code> to add a new employee name to the\u00a0JList<\/a><\/code>, we register an\u00a0ActionListener<\/a><\/code>, then we implement the\u00a0actionPerformed<\/a><\/span>(ActionEvent<\/a>\u00a0e)<\/code>\u00a0method to add a single employee name to our employees list. Now, we can write any employee name in the input text box and click the Add Employee<\/code> button to be added to the employees list.<\/p>\n
        JButton addButton = new JButton(\"Add Employee\");\r\naddButton.addActionListener(new ActionListener() {\r\n\tpublic void actionPerformed(ActionEvent e) {\r\n\t\tString name = nameField.getText();\r\n\t\tif (name != null && !\"\".equals(name)) {\r\n\t\t\tswingJList.addElement(name);\r\n\t\t} else {\r\n\t\t\tJOptionPane.showMessageDialog(null,\r\n\t\t\t\t\t\"Employee name is empty\", \"Error\",\r\n\t\t\t\t\tJOptionPane.ERROR_MESSAGE);\r\n\t\t}\r\n\t}\r\n});\r\n<\/pre>\n<\/li>\n
      2. Delete Action Listener<\/span>:
        \nWe create deleteButton<\/code>         JButton<\/a><\/code> to remove selected employee name from the\u00a0JList<\/a><\/code>, we register an\u00a0ActionListener<\/a><\/code>, then we implement the\u00a0actionPerformed<\/a><\/span>(ActionEvent<\/a>\u00a0e)<\/code>\u00a0method to remove a single employee name from our employees list. Now, we can select a single employee name and click the Delete Employee<\/code> button to be removed from the employees list.<\/p>\n
        JButton deleteButton = new JButton(\"Delete Employee\");\r\ndeleteButton.addActionListener(new ActionListener() {\r\n\tpublic void actionPerformed(ActionEvent e) {\r\n\t\tString name = nameField.getText();\r\n\t\tif (name != null && !\"\".equals(name)) {\r\n\t\t\tswingJList.removeElement(name);\r\n\t\t} else {\r\n\t\t\tJOptionPane.showMessageDialog(null,\r\n\t\t\t\t\t\"Please, select employee name from the list\",\r\n\t\t\t\t\t\"Warning\", JOptionPane.WARNING_MESSAGE);\r\n\t\t}\r\n\t}\r\n});\r\n<\/pre>\n<\/li>\n<\/ol>\n
        4. JList Demo:<\/h2>\n
        We create SwingJListDemo.java<\/code> class to test our example. Also, we add a supplementary Constants.java<\/code> class contains constants used through our\u00a0code.<\/p>\n
        SwingJListDemo.java<\/span>:<\/em><\/p>\n
        package com.jcg;\r\n\r\nimport java.awt.Dimension;\r\nimport java.awt.event.ActionEvent;\r\nimport java.awt.event.ActionListener;\r\nimport java.util.Arrays;\r\n\r\nimport javax.swing.BorderFactory;\r\nimport javax.swing.JButton;\r\nimport javax.swing.JFrame;\r\nimport javax.swing.JOptionPane;\r\nimport javax.swing.JPanel;\r\nimport javax.swing.JScrollPane;\r\nimport javax.swing.JSplitPane;\r\nimport javax.swing.JTextField;\r\nimport javax.swing.SwingUtilities;\r\nimport javax.swing.UIManager;\r\nimport javax.swing.UIManager.LookAndFeelInfo;\r\nimport javax.swing.border.TitledBorder;\r\nimport javax.swing.event.ListSelectionEvent;\r\nimport javax.swing.event.ListSelectionListener;\r\n\r\n\/**\r\n * @author ashraf_sarhan\r\n * \r\n *\/\r\npublic class SwingJListDemo {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tSwingUtilities.invokeLater(new Runnable() {\r\n\t\t\tpublic void run() {\r\n\t\t\t\ttry {\r\n\t\t\t\t\tsetLookAndFeel(Constants.NIMBUS_LF);\r\n\t\t\t\t\tcreateAndShowGUI();\r\n\t\t\t\t} catch (Exception e) {\r\n\t\t\t\t\te.printStackTrace();\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t});\r\n\t}\r\n\r\n\tpublic static void createAndShowGUI() throws Exception {\r\n\r\n\t\tJFrame frame = new JFrame(\"Swing JList Demo\");\r\n\t\tframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);\r\n\r\n\t\t\/\/ Create JList with a List of String names\r\n\t\tSwingJList<String> swingJList = new SwingJList<>(\r\n\t\t\t\tArrays.asList(Constants.LIST_DATA));\r\n\r\n\t\tJTextField nameField = new JTextField(26);\r\n\r\n\t\t\/\/ Adding a list selection listener\r\n\t\tswingJList.addListSelectionListener(new ListSelectionListener() {\r\n\t\t\t@Override\r\n\t\t\tpublic void valueChanged(ListSelectionEvent e) {\r\n\t\t\t\tif (!e.getValueIsAdjusting()) {\r\n\t\t\t\t\tString selectedName = swingJList.getSelectedValue();\r\n\t\t\t\t\tnameField.setText(selectedName);\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t});\r\n\r\n\t\t\/\/ Create an action listener to add a new item to the List\r\n\t\tJButton addButton = new JButton(\"Add Employee\");\r\n\t\taddButton.addActionListener(new ActionListener() {\r\n\t\t\tpublic void actionPerformed(ActionEvent e) {\r\n\t\t\t\tString name = nameField.getText();\r\n\t\t\t\tif (name != null && !\"\".equals(name)) {\r\n\t\t\t\t\tswingJList.addElement(name);\r\n\t\t\t\t} else {\r\n\t\t\t\t\tJOptionPane.showMessageDialog(null,\r\n\t\t\t\t\t\t\t\"Employee name is empty\", \"Error\",\r\n\t\t\t\t\t\t\tJOptionPane.ERROR_MESSAGE);\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t});\r\n\r\n\t\t\/\/ Create an action listener to remove existed item from the List\r\n\t\tJButton deleteButton = new JButton(\"Delete Employee\");\r\n\t\tdeleteButton.addActionListener(new ActionListener() {\r\n\t\t\tpublic void actionPerformed(ActionEvent e) {\r\n\t\t\t\tString name = nameField.getText();\r\n\t\t\t\tif (name != null && !\"\".equals(name)) {\r\n\t\t\t\t\tswingJList.removeElement(name);\r\n\t\t\t\t} else {\r\n\t\t\t\t\tJOptionPane.showMessageDialog(null,\r\n\t\t\t\t\t\t\t\"Please, select employee name from the list\",\r\n\t\t\t\t\t\t\t\"Warning\", JOptionPane.WARNING_MESSAGE);\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t});\r\n\r\n\t\t\/\/ Put the JList in a JScrollPane to handle scrolling\r\n\t\tJScrollPane listScrollPane = new JScrollPane(swingJList);\r\n\t\tlistScrollPane.setPreferredSize(new Dimension(250, 200));\r\n\r\n\t\tlistScrollPane.setBorder(BorderFactory.createTitledBorder(\r\n\t\t\t\tBorderFactory.createEtchedBorder(), \"Employees List\",\r\n\t\t\t\tTitledBorder.CENTER, TitledBorder.TOP));\r\n\r\n\t\t\/\/ Create a control panel\r\n\t\tJPanel buttonPane = new JPanel();\r\n\t\tbuttonPane.add(nameField);\r\n\t\tbuttonPane.add(addButton);\r\n\t\tbuttonPane.add(deleteButton);\r\n\r\n\t\tJSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,\r\n\t\t\t\tlistScrollPane, buttonPane);\r\n\t\tsplitPane.setDividerLocation(250);\r\n\t\tsplitPane.setEnabled(false);\r\n\r\n\t\tframe.add(splitPane);\r\n\t\tframe.pack();\r\n\t\tframe.setLocationRelativeTo(null);\r\n\t\tframe.setVisible(true);\r\n\t}\r\n\r\n\tpublic static void setLookAndFeel(String lf) throws Exception {\r\n\t\t\/\/ Set Nimbus as L&F\r\n\t\ttry {\r\n\t\t\tfor (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {\r\n\t\t\t\tif (lf.equals(info.getName())) {\r\n\t\t\t\t\tUIManager.setLookAndFeel(info.getClassName());\r\n\t\t\t\t\tbreak;\r\n\t\t\t\t}\r\n\t\t\t}\r\n\t\t} catch (Exception e) {\r\n\t\t\t\/\/ If Nimbus is not available, you can set the GUI the system\r\n\t\t\t\/\/ default L&F.\r\n\t\t\tUIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());\r\n\t\t}\r\n\t}\r\n\r\n}\r\n<\/pre>\n
        Constants.java<\/span>:<\/em><\/p>\n
        package com.jcg;\r\n\r\n\/**\r\n * @author ashraf_sarhan\r\n * \r\n *\/\r\npublic class Constants {\r\n\r\n\tpublic static final String NIMBUS_LF = \"Nimbus\";\r\n\r\n\tpublic static final String[] LIST_DATA = { \"Ashraf Sarhan\", \"Sara Mohamed\",\r\n\t\t\t\"Esraa Ahmed\", \"Ghada Mohamed\", \"Dalia Osama\", \"Amira Mohamed\",\r\n\t\t\t\"Sama Karim\", \"Nada Ahmed\", \"Ahmed Farrag\", \"Mohamed Senussi\",\r\n\t\t\t\"Nehal Taha\", \"Ahmed Sarhan\", \"Khaled Mohamed\" };\r\n\r\n\tpublic static final int NEW_ELEMENT_IDX = 0;\r\n\r\n}\r\n<\/pre>\n
        Output<\/span>:<\/em>
        \n
        \"Figure<\/a>
        Figure 4: Swing JList Demo<\/figcaption><\/figure><\/p>\n
        5. Download the Source Code of this example:<\/h2>\n
        This was an example on how to use Java Swing\u00a0JList<\/a><\/code>.<\/p>\n
        Download<\/strong>
        \nYou can download the full source code of this example here:         SwingJListExampleCode.zip<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
        In this example we are going to demonstrate how to use Java Swing JList, JList\u00a0is a Swing component with which we can display a list of elements. This component also allows the user to select one or more elements visually. This article shows how to work with\u00a0JList features using a simple example where we build …<\/p>\n","protected":false},"author":24,"featured_media":1204,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[145],"tags":[],"class_list":["post-23138","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jlist"],"yoast_head":"\nJava JList Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In this example we are going to demonstrate how to use Java Swing JList, JList\u00a0is a Swing component with which we can display a list of elements. 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