Why JFrame is used in Java?

Why JFrame is used in Java?

The Java Swing JFrame class is the foundation for creating graphical Java applications. Without the frame, you can't perform any interactions. When you create a new instance of the JFrame, you can pass a title to the constructor or simply create an empty frame.

What is Java getContentPane?

The getContentPane() method retrieves the content pane layer so that you can add an object to it. The content pane is an object created by the Java run time environment. ... When you use getContentPane(), the content pane object then is substituted there so that you can apply a method to it.

What is a JPanel?

JPanel, a part of Java Swing package, is a container that can store a group of components. The main task of JPanel is to organize components, various layouts can be set in JPanel which provide better organisation of components, however it does not have a title bar.

Is JPanel a class?

The JPanel is a simplest container class. It provides space in which an application can attach any other component. It inherits the JComponents class.

What is difference between JFrame and JPanel?

Basically, a JFrame represents a framed window and a JPanel represents some area in which controls (e.g., buttons, checkboxes, and textfields) and visuals (e.g., figures, pictures, and even text) can appear.

Can a JPanel contain another JPanel?

A JPanel is a container that is itself a JComponent. A JPanel can contain other components, and it can in turn be contained in another component. The fact that panels can contain other panels means that you can have many levels of components containing other components, as shown in the illustration on the right.

What method is called on an instance of class Jlabel to set the background color?

setBackground

Which layout manager is the default for JFrame?

BorderLayout

How can you cause a content pane to be automatically sized to accommodate the components contained within it?

How can you cause a content pane to be automatically sized to accommodate the components contained within it? By calling the pack method. What is the default layout manager for a JFrame object's content pane?

How do you resize a component in Java?

You can resize a component by setting a client property on the component. Three sizes are supported in addition to the "regular" size: mini, small, and large. The one component that does not support the size variants property is JLabel . However, you can change the size of a label by changing the size of its font.

Which is the right syntax for split pane?

The two components in a split pane can be aligned left to right using JSplitPane. HORIZONTAL_SPLIT, or top to bottom using JSplitPane. VERTICAL_SPLIT....Useful Fields.
Modifier and TypeFieldDescription
static intVERTICAL_SPLITVertical split indicates the Components are split along the y axis.

What type of event does a radio button generate when the user clicks on it?

action event

What is JCheckBox in Java?

The JCheckBox class is used to create a checkbox. It is used to turn an option on (true) or off (false). Clicking on a CheckBox changes its state from "on" to "off" or from "off" to "on ". It inherits JToggleButton class.

Is selected checkbox Java?

To check if a box is selected, use the isSelected() method. The JCheckBox and the JRadioButton are subclasses of JToggleButton. A toggle button is a two-state button which operates like a light switch, on or off.

How do you code a button in Java?

Java JButton Example

  1. import javax.swing.*;
  2. public class ButtonExample {
  3. public static void main(String[] args) {
  4. JFrame f=new JFrame("Button Example");
  5. JButton b=new JButton("Click Here");
  6. b.setBounds(30);
  7. f.add(b);
  8. f.setSize(400,400);

What is a button group Java?

Button groups ( javax. swing. ButtonGroup ) are used in combination with radio buttons to ensure that only one radio button in a group of radio buttons is selected. To visualize the grouping, JFormDesigner displays lines connecting the grouped buttons.

What is JTextField in Java?

JTextField is a lightweight component that allows the editing of a single line of text. For information on and examples of using text fields, see How to Use Text Fields in The Java Tutorial. ... The java. awt. TextField used the text of the field as the command string for the ActionEvent .