Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Object Oriented Programming Articles
Page 494 of 589
How to implement the search functionality of a JTable in Java?
A JTable is a subclass of JComponent for displaying complex data structures. A JTable component can follow the Model View Controller (MVC) design pattern for displaying the data in rows and columns. A JTable can generate TableModelListener, TableColumnModelListener, ListSelectionListener, CellEditorListener, RowSorterListener interfaces. We can implement the search functionality of a JTable by input a string in the JTextField, it can search for a string available in a JTable. If the string matches it can only display the corresponding value in a JTable. We can use the DocumentListener interface of a JTextField to implement it.Exampleimport java.awt.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public ...
Read MoreHow to call C++ functions from Java?
Following are the steps to use native methods.Create a header file (.h file) for a CPP program.Create CPP fileCreate a DLLIn java code, declare the method as native, load the DLL using System.loadLibrary() method and call the method.
Read MoreHow to change the position of a JSlider to horizontal/vertical programmatically in Java?
A JSlider is a subclass of JComponent class and it is similar to scroll bar which allows the user to select a numeric value from a specified range of integer values. It has a knob which can slide on a range of values and can be used to select a particular value. A JSlider can generate a ChangeListener interface and the important methods of JSlider are getMaximum(), getMinimum(), getOrientation(), getValue() and setValue(). The default position of a JSlider is horizontal and we can also set the position to vertical programmatically by selecting a menu item from a menu bar. It can generate an ActionListener interface ...
Read MoreHow to set a tooltip to each column of a JTableHeader in Java?
A JTableHeader is a subclass of JComponent class, When we create a JTable object, the constructor creates a new JTableHeader object to manage the table component's header. A JTable supplies a setTableHeader() method that establishes the table header component's JTableHeader object and a getTableHeader() method that returns a reference to the table header component's JTableHeader object. We can set a tooltip text to each column of a JTableHeader by overriding the getToolTipText() method of JTableHeader class.Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.table.*; public class JTableHeaderToolTipTest extends JPanel { private DefaultTableModel dmodel; private JTable table; private JScrollPane jsp; public JTableHeaderToolTipTest() ...
Read MoreHow can we set the orientation of a JTextArea from right to left in Java?
A JTextArea is a subclass of JTextComponent class and it is a multi-line text component to display the text or allow a user to enter the text. A JTextArea can generate a CaretListener interface when we are trying to implement the functionality of the JTextArea. By default, a JTextarea allows the orientation from left to right, if the user wants to enter a text from right to left by using the setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT) method of JTextArea class.Exampleimport java.awt.*; import javax.swing.event.*; import javax.swing.*; public class JTextAreaOrientationTest extends JFrame { private JTextArea textArea; public JTextAreaOrientationTest() { setTitle("JTextAreaOrientation Test"); textArea = new ...
Read MoreHow can we change the JButton text dynamically in Java?
A JButton is a subclass of AbstractButton and it can be used for adding platform-independent buttons in a Java Swing application. A JButon can generate an ActionListener interface when the user clicking on a button, it can also generate the MouseListener and KeyListener interfaces. By default, we can create a JButton with a text and also can change the text of a JButton by input some text in the text field and click on the button, it will call the actionPerformed() method of ActionListener interface and set an updated text in a button by calling setText(textField.getText()) method of a JButton class.Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public ...
Read MoreHow to display a value when select a JList item in Java?
A JList is a subclass of JComponent class that allows the user to choose either a single or multiple selections of items. A JList can generate a ListSelectiionListener interface and it includes one abstract method valueChanged(). We can display a value when an item is selected from a JList by implementing MouseListener interface or extending MouseAdapter class and call the getClickCount() method with single-click event (getClickCount() == 1) of MouseEvent class.Exampleimport javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; public class JListItemSeletionTest extends JFrame { private JList list; private JScrollPane jsp; private Vector data; public JListItemSeletionTest() { setTitle("JListItemSeletion Test"); ...
Read MoreHow many types of selection modes for a JList in Java?
A JList is a component that can extend JComponent class used to display a list of objects that allows the user to select one or more items.There are three types of selection modes for a JList in JavaListSelectionModel.SINGLE_SELECTION: Only one list index can be selected at a time.ListSelectionModel.SINGLE_INTERVAL_SELECTION: Only one contiguous interval can be selected at a time.ListSelectionModel.MULTIPLE_INTERVAL_SELECTION: In this mode, there is no restriction on what can be selected. This is a default mode.Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class JListSelectionModeTest extends JFrame implements ActionListener { private JList list; private DefaultListModel listModel; public JListSelectionModeTest() { ...
Read MoreHow can we implement a scrollable JPanel in Java?
JPanelA JPanel is a subclass of JComponent (a subclass of a Container class). Therefore, JPanel is also a Container.A JPanel is an empty area that can be used either to layout other components including other panels.In a JPanel, we can add fields, labels, buttons, checkboxes, and images also.The Layout Managers such as FlowLayout, GridLayout, BorderLayout and other layout managers helps us to control the sizes, positions, and alignment of the components using JPanel.The important methods of a JPanel class are getAccessibleContext(), getUI(), updateUI() and paramString().We can also implement a JPanel with vertical and horizontal scrolls by adding the panel object to JScrollPane.Exampleimport java.awt.*; ...
Read MoreHow can we implement editable JComboBox in Java?
JComboBoxA JComboBox can extend JComponent class and it is a combination of a text field and a drop-down list from which the user can choose a value.If the text field portion of the control is editable, the user can enter a value in the field or edit a value retrieved from the drop-down list.By default, the user not allowed to edit the data in the text field portion of the JComboBox. If we want to allow the user to edit the text field, call setEditable(true) method.A JComboBox can generate an ActionListener, ChangeListener or ItemListener when the user actions on a combo box.A ...
Read More