Graphical User Interface in JAVA
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This document discusses graphical user interface (GUI) components in Java and layout managers. It provides descriptions of common GUI components like JLabel, JTextField, JButton, JCheckBox, and JComboBox. It then explains several layout managers - BorderLayout, CardLayout, FlowLayout, GridLayout, GridBagLayout, GroupLayout, and SpringLayout - and provides their class declarations.
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Importance of a safe environment for public health
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- 1. GUI
- 2. A graphical user interface (GUI) presents a pictorial interface to a program, GUI's allow the user to work in a more productive manner. A GUI component is an object with which the user interacts via the mouse or keyboard, below are some of the Java GUI components
- 4. Some of the basic GUI components are JLabelAn area where uneditable text or icons can be displayed JTextFieldAn area where the user inputs data from the keyboard, this area can also display data JButtonAn area that triggers an event when clicked JCheckBoxA GUI component that is either selected or not selected JComboBoxA drop-down list of items from which the user can make a selection by clicking an item in the list or typing into the box JListAn area where a list of items is displayed from which the user can make a selection by clicking once on any element in the list. Double-clicking an element in the list generates an action event, Multiple elements can be selected JPanelA container in which components can be placed
- 5. Java Layout Managers The GUI is made up of a number of components, the Layout Managers affect the content pane. Layout Managers are provided to arrange GUI components on a container for presentation purposes. This allows the programmer to concentrate on the basic "look and feel" and lets the layout managers process most of the layout details
- 7. Several AWT and Swing classes provide layout managers for general use: 1. BorderLayout 2. BoxLayout 3. CardLayout 4. FlowLayout 5. GridBagLayout 6. GridLayout 7. GroupLayout 8. SpringLayout
- 8. Here are 5 of the layout managers.
- 9. BorderLayout The class BorderLayout arranges the components to fit in the five regions: east, west, north, south and center. Each region is can contain only one component and each component in each region is identified by the corresponding constant NORTH, SOUTH, EAST, WEST, and CENTER. Class declaration Following is the declaration for java.awt.BorderLayout class: public class BorderLayout extends Object implements LayoutManager2, Serializable
- 10. Here are the constructors defined by BorderLayout: 1. BorderLayout() 2. BorderLayout(int horz, int vert) the first form creates a default border layout. The second allows you to specify the horizontal and vertical space left between components in horz and vert, respectively. BorderLayout defines the following constants that specify the regions. BorderLayout.CENTER, BorderLayout.SOUTH, BorderLayout.EAST, BorderLayout.WEST, BorderLayout.NORTH
- 12. CardLayout The class CardLayout arranges each component in the container as a card. Only one card is visible at a time, and the container acts as a stack of cards. Class declaration Following is the declaration for java.awt.CardLayout class: public class CardLayout extends Object implements LayoutManager2, Serializable
- 13. CardLayout provides these two constructors: 1. CardLayout() 2. CardLayout(int horz, int vert)
- 15. FlowLayout The class FlowLayout components in a left-to-right flow. This is the most basic layout manager, components are placed from left to right as they were added, when the edge is reached the components are put on the next line. You can align the components left, right or center (default). Class declaration Following is the declaration for java.awt.FlowLayout class: public class FlowLayout extends Object implements LayoutManager, Serializable
- 16. Here are the constructors for FlowLayout: 1. FlowLayout() 2. FlowLayout(int how) 3. FlowLayout(int how, int horz, int vert) The first form creates the default layout, which centers components and leaves five pixels of space between each component. The second form lets you specify how each line is aligned. Valid values of how are as follows: FlowLayout.LEFT FlowLayout.CENTER FlowLayout.RIGHT
- 18. GridLayout Introduction The class GridLayout arranges components in a rectangular grid. Class declaration Following is the declaration for java.awt.GridLayout class: public class GridLayout extends Object implements LayoutManager, Serializable
- 19. GridLayout are shown here: 1. GridLayout() 2. GridLayout(int numRows, int numColumns) 3. GridLayout(int numRows, int numColumns, int horz, int vert)
- 20. GridBagLayout The class GridBagLayout arranges components in a horizontal and vertical manner. Class declaration Following is the declaration for java.awt.GridBagLayout class: public class GridBagLayout extends Object implements LayoutManager2, Serializable
- 22. GroupLayout GroupLayout is a layout manager that was developed for use by GUI builder tools, but it can also be used manually. GroupLayout works with the horizontal and vertical layouts separately. The layout is defined for each dimension independently. Consequently, however, each component needs to be defined twice in the layout. The Find window shown above is an example of a GroupLayout. . Class declaration Following is the declaration for javax.swing.GroupLayout class: public class GroupLayout extends Object implements LayoutManager2
- 24. SpringLayout SpringLayout is a flexible layout manager designed for use by GUI builders. It lets you specify precise relationships between the edges of components under its control. For example, you might define that the left edge of one component is a certain distance (which can be dynamically calculated) from the right edge of a second component.SpringLayout lays out the children of its associated container according to a set of constraints, as shall be seen in Class declaration Following is the declaration for javax.swing.SpringLayout class: public class SpringLayout extends Object implements LayoutManager2