What is layout in Java?

What is layout in Java?

Layout means the arrangement of components within the container. In other way we can say that placing the components at a particular position within the container. The task of layouting the controls is done automatically by the Layout Manager.

What is layout in Java Swing?

Advertisements. Layout refers to the arrangement of components within the container. In another way, it could be said that layout is placing the components at a particular position within the container. The task of laying out the controls is done automatically by the Layout Manager.

What are the different layout used in Java programming?

java.awt.GridBagLayout. javax.swing.BoxLayout. javax.swing.GroupLayout. javax.swing.ScrollPaneLayout.

How many layouts are there in Java?

7 layout

What is the difference between GridLayout and GridBagLayout?

A GridLayout puts all the components in a rectangular grid and is divided into equal-sized rectangles and each component is placed inside a rectangle whereas GridBagLayout is a flexible layout manager that aligns the components vertically and horizontally without requiring that the components be of the same size.

Why layouts are needed in Java?

The Layout managers enable us to control the way in which visual components are arranged in the GUI forms by determining the size and position of components within the containers.

Which layout is default in Java?


How do I use AWT in Java?

Java AWT (Abstract Window Toolkit) is an API to develop GUI or window-based applications in java. Java AWT components are platform-dependent i.e. components are displayed according to the view of operating system. AWT is heavyweight i.e. its components are using the resources of OS.

How does GridLayout work in Java?

Creates a grid layout with the specified number of rows and columns. All components in the layout are given equal size. One, but not both, of rows and cols can be zero, which means that any number of objects can be placed in a row or in a column.

What is null layout in Java?

null layout is not a real layout manager. It means that no layout manager is assigned and the components can be put at specific x,y coordinates. It is useful for making quick prototypes. But it is not recommended for production because it is not portable.

How do you code a grid in Java?

Java GridLayout

  1. GridLayout(): creates a grid layout with one column per component in a row.
  2. GridLayout(int rows, int columns): creates a grid layout with the given rows and columns but no gaps between the components.

What is JSlider in Java?

JSlider is an implementation of slider. The Component allows the user to select a value by sliding the knob withing the bounded value . The slider can show Major Tick marks and also the minor tick marks between two major tick marks, The knob can be positioned at only those points.

What is JSpinner in Java?

JSpinner is a part of javax. swing package . JSpinner contains a single line of input which might be a number or a object from a ordered sequence . The user can manually type in a legal data into the text field of the spinner . The spinner is sometimes preferred because they do not need a drop down list .

What is JDialog in Java?

JDialog is a part Java swing package. The main purpose of the dialog is to add components to it. JDialog can be customized according to user need . Constructor of the class are: JDialog() : creates an empty dialog without any title or any specified owner.

What is JMenu in Java?

The JMenuBar class is used to display menubar on the window or frame. It may have several menus. The object of JMenu class is a pull down menu component which is displayed from the menu bar. The items used in a menu must belong to the JMenuItem or any of its subclass. ...

What is JFrame class in Java?

A frame, implemented as an instance of the JFrame class, is a window that has decorations such as a border, a title, and supports button components that close or iconify the window. Applications with a GUI usually include at least one frame. Applets sometimes use frames, as well.

What is the layout for toolbar in Java?

In order to create a toolbar in Java Swing, you use JToolBar class. The JToolbar class supports two orientations: vertical and horizontal. You use the orientation attribute to maintain the current orientation of the toolbar. You can add any component to the toolbar including button, combobox and menu.

How do you add mnemonics in Java?

To set mnemonic and keyboard accelerators for menu items, one should follow these steps:

  1. Create a new JFrame .
  2. Create a new JMenu .
  3. Use setMnemonic('M') to set a mnemonic for the menu. ...
  4. Create a new JMenuItem .
  5. Use setAccelerator(KeyStroke. ...
  6. Create a new JLabel .
  7. Use setDisplayedMnemonic to set a mnemonic on the label.

What is mnemonic in Java?

A mnemonic is a key that makes an already visible menu item be chosen. For example, in MenuDemo the first menu has the mnemonic A, and its second menu item has the mnemonic B. This means that, when you run MenuDemo with the Java look and feel, pressing the Alt and A keys makes the first menu appear.

What is popup menu in Java?

A popup menu is a free-floating menu which associates with an underlying component. This component is called the invoker. Most of the time, popup menu is linked to a specific component to display context-sensitive choices. In order to create a popup menu, you use the class JPopupMenu.

How do you use JPopupMenu?

Commonly used methods of JPopupMenu are :

  1. add(JMenuItem menuItem) : add menuItem to the popup menu.
  2. add(String s) : add String to the popup menu .
  3. String getLabel() : get the popup menu's label.
  4. boolean is Visible() : returns whether the JPopup menu is visible or not.
  5. setLabel(String s) : sets the popup menu's label.

What class creates a popup list?

The android.widget.PopupMenu is the direct subclass of java.lang.Object class.

What is the purpose of JTable?

The JTable is used to display and edit regular two-dimensional tables of cells.

What event is generated when a user makes a menu selection?

When a menu item is selected, AWT sends an action event to the menu item. Since the event is an instance of ActionEvent , the processEvent method examines the event and passes it along to processActionEvent .

Which method is used to know which key is pressed?

Which of these methods can be used to know which key is pressed? Explanation: The getModifiers() methods returns a value that indicates which modifiers keys (ALT, CTRL, META, SHIFT) were pressed when the event was generated. 5.

What type of an event is generated when a push button is pressed?

type ActionEvent

What is the use of JFC in Java Swing?

JFC is short for Java Foundation Classes, which encompass a group of features for building graphical user interfaces (GUIs) and adding rich graphics functionality and interactivity to Java applications.

Is Java Swing a framework?

Swing is a platform-independent, "model–view–controller" GUI framework for Java, which follows a single-threaded programming model. Additionally, this framework provides a layer of abstraction between the code structure and graphic presentation of a Swing-based GUI.

What are the swing components in Java?

Below are the different components of swing in java:

  • ImageIcon. The ImageIcon component creates an icon sized-image from an image residing at the source URL. ...
  • JButton. JButton class is used to create a push-button on the UI. ...
  • JLabel. ...
  • JTextField. ...
  • JTextArea. ...
  • JPasswordField. ...
  • JCheckBox. ...
  • JRadioButton.

What is API in Java?

API stands for application programming interface, a concept that applies everywhere from command-line tools to enterprise Java code to Ruby on Rails web apps. An API is a way to programmatically interact with a separate software component or resource.