![]() Public class JButton extends AbstractButton implements AccessibleĪlso illustarte Java JButton : An example with ActionListenerī. It inherits AbstractButton class.īelow is the declaration for class. The application result in some action when the button is pushed. The JButton class is used to create a labeled button that has platform independent implementation. ![]() inherit the JFrame class, so there is no need to create the instance of JFrame class explicitly. Then within the north JPanel, you can place four JButtons using GRidLayout and within the east JPanel, you can place three JLabels using FlowLayout. Creating JFrame, JButton and method call inside the java constructor. We can also write all the codes of creating JFrame, JButton and method call inside the Java constructor.į.setSize(400,500) //400 width and 500 heightį.setLayout(null) //using no layout managersį.setVisible(true) //making the frame visible Next, we call the JFrame method set Layout Manager(new BorderLayout ()). This is because by default a JPanel uses FlowLayout. JLabel label = new JLabel("JFrame By Example") įtDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) When we added things to the JPanel we just added them without specifying a compass direction. JFrame frame = new JFrame("JFrame Example") ![]() Example of FlowLayout class: Using FlowLayout() constructor. FlowLayout(int align, int hgap, int vgap): creates a flow layout with the given alignment and the given horizontal and vertical gap. A program to add a label and button in a frame FlowLayout(int align): creates a flow layout with the given alignment and a default 5 unit horizontal and vertical gap. Let's see a simple swing example where we are creating one button and adding it on the JFrame object inside the main() method. We can write the code of Swing inside the main(), constructor or any other method. We set the title and bounds of the frame by method setTitle and setBounds. We create 5 JLabel components named l1, l2 l5 and then add them to the JFrame by the method this.add (). By creating the object of Frame class (Association) Program 1: The following program illustrates the use of FlowLayout by arranging several JLabel components in a JFrame, whose instance class is named as Example.NoteThe Java Foundation Classes (JFC) are a set of GUI components which simplify the development of desktop applications.įigure 10.2 :Hierarchy of Java Swing classesĬommonly used methods in Component class:įigure 10.3 :Commonly used methods in Component class: The javax.swing package provides classes for Java Swing components such as JButton, JTextField, JTextArea, JRadioButton, JCheckbox, JMenu, JColorChooser etc. Java Swing provides better lightweight components than AWT. The variable bGroup references a ButtonGroup object, which contains several button components. It is built on the top of AWT (Abstract Windowing Toolkit) API and entirely written in Java. The variable panel references a JPanel object. Java Swing is a part of Java Foundation Classes (JFC) that is used to create window-based applications. Chapter 10 - Java Swing Chapter 10 Java Swing
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