Java GUI Source Code Examples

When it comes to building graphical user interfaces (GUIs) in Java, understanding the various components and their usage is crucial. In this article, we'll explore some essential examples of Java GUI source code, including radio buttons, check boxes, password fields, text areas, and text fields.

Radio Buttons

In Java, `JRadioButton` is used to render a group of radio buttons in the UI. A user can select one choice from the group. For example:

```java

JRadioButton rb3 = new JRadioButton('Hard');

JRadioButton rb2 = new JRadioButton('Medium');

JRadioButton rb1 = new JRadioButton('Easy', true);

ButtonGroup radioGroup = new ButtonGroup();

```

In this example, `rb1` is set to the default state of 'on' using the second parameter in the constructor. This means that when the program starts, the first option will be selected by default.

Check Boxes

`JCheckBox` renders a check box with a label. For example:

```java

JCheckBox chkBox = new JCheckBox('Show Help', true);

```

In this case, the checkbox is initialized with the label 'Show Help' and set to the default state of 'on'.

Password Fields

`JPasswordField` is used for inserting passwords into an application. It renders a text box that masks user input text with bullet points. For example:

```java

JPasswordField pwdField = new JPasswordField(15);

```

This code creates a password field with 15 column width.

Text Areas

`JTextArea` renders a multi-line text area of height 5 rows and width 20 columns, with default text initialized in the text area. For example:

```java

JTextArea txtArea = new JTextArea('This text is default text for text area.', 5, 20);

```

In this case, the text area has a default text and can display multiple lines of input.

Text Fields

`JTextField` renders an editable single-line text box. For example:

```java

JTextField txtBox = new JTextField(20);

```

This code creates a text field with 20 column width.

Labels

`JLabel` is used to render a read-only text label or images on the UI. For example:

```java

JLabel textLbl = new JLabel('This is a text label.');

```

In this case, the label displays the text 'This is a text label.' without generating any event.

These examples demonstrate the basic usage of Java GUI components, including radio buttons, check boxes, password fields, text areas, text fields, and labels. By understanding how to use these components effectively, you can create more engaging and user-friendly graphical user interfaces in your Java applications.

Java gui source code examples