Sample Objects of different Classes

Classes used to create the above components are as follows:

Component Name	Class Name
Frame	JFrame
Panel	JPanel
Button	JButton
Label	JLabel
TextField	JTextField
RadioButton	JRadioButton
ChekBox	JCheckBox
ComboBox	JComboBox

JFrame frame = new JFrame("Welcome");

JPanel panel = new JPanel();

JLabel lblusername = new JLabel("User Name");

JTextField txtusername = new JTextField(30);

JButton btnOk = new JButton("OK");

JRadioButton rbMale = new JRadioButton();

JCheckBox cbHobby = new JCheckBox();

JComboBox cbxCity = new JComboBox();

How to create a object of button class in java

JButton btnOk = new JButton("OK");

here JButton is a class, btnOk is a object of the class JButton.


new is a keyword which allocate memory to btnOk object after taking it from Constructor (JButton()).

here constructor is passing parameter as "OK" which will be displayed on the button.

Basic Java Interface

Let's understand simple Java interface

In the above picture we have create a Frame using JFrame class of Java.

Other components add are like as follows

1. Frame
2. Panel
3. Button
4. Label
5. TextField

Classes used to create the above components are as follows:

Component Name	Class Name
Frame	JFrame
Panel	JPanel
Button	JButton
Label	JLabel
TextField	JTextField
RadioButton	JRadioButton
ChekBox	JCheckBox
ComboBox	JComboBox