SWING - FlowLayout Class
Introduction
The class FlowLayout components in a left-to-right flow.
Class declaration
Following is the declaration for java.awt.FlowLayout class:
public class FlowLayout extends Object implements LayoutManager, Serializable
Field
Following are the fields for java.awt.BorderLayout class:
static int CENTER -- This value indicates that each row of components should be centered.
static int LEADING -- This value indicates that each row of components should be justified to the leading edge of the container's orientation, for example, to the left in left-to-right orientations.
static int LEFT -- This value indicates that each row of components should be left-justified.
static int RIGHT -- This value indicates that each row of components should be right-justified.
static int TRAILING -- This value indicates that each row of components should be justified to the trailing edge of the container's orientation, for example, to the right in left-to-right orientations.
Class constructors
S.N. | Constructor & Description |
---|---|
1 | FlowLayout() Constructs a new FlowLayout with a centered alignment and a default 5-unit horizontal and vertical gap. |
2 | FlowLayout(int align) Constructs a new FlowLayout with the specified alignment and a default 5-unit horizontal and vertical gap. |
3 | FlowLayout(int align, int hgap, int vgap) Creates a new flow layout manager with the indicated alignment and the indicated horizontal and vertical gaps. |
Class methods
S.N. | Method & Description |
---|---|
1 | void addLayoutComponent(String name, Component comp) Adds the specified component to the layout. |
2 | int getAlignment() Gets the alignment for this layout. |
3 | int getHgap() Gets the horizontal gap between components. |
4 | int getVgap() Gets the vertical gap between components. |
5 | void layoutContainer(Container target) Lays out the container. |
6 | Dimension minimumLayoutSize(Container target) Returns the minimum dimensions needed to layout the visible components contained in the specified target container. |
7 | Dimension preferredLayoutSize(Container target) Returns the preferred dimensions for this layout given the visible components in the specified target container. |
8 | void removeLayoutComponent(Component comp) Removes the specified component from the layout. |
9 | void setAlignment(int align) Sets the alignment for this layout. |
10 | void setHgap(int hgap) Sets the horizontal gap between components. |
11 | void setVgap(int vgap) Sets the vertical gap between components. |
12 | String toString() Returns a string representation of this FlowLayout object and its values. |
Methods inherited
This class inherits methods from the following classes:
java.lang.Object
FlowLayout Example
Create the following java program using any editor of your choice in say D:/ > SWING > com > tutorialspoint > gui >
SwingLayoutDemo.javapackage com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingLayoutDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; private JLabel msglabel; public SwingLayoutDemo(){ prepareGUI(); } public static void main(String[] args){ SwingLayoutDemo swingLayoutDemo = new SwingLayoutDemo(); swingLayoutDemo.showFlowLayoutDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java SWING Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); headerLabel = new JLabel("",JLabel.CENTER ); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showFlowLayoutDemo(){ headerLabel.setText("Layout in action: FlowLayout"); JPanel panel = new JPanel(); panel.setBackground(Color.darkGray); panel.setSize(200,200); FlowLayout layout = new FlowLayout(); layout.setHgap(10); layout.setVgap(10); panel.setLayout(layout); panel.add(new JButton("OK")); panel.add(new JButton("Cancel")); controlPanel.add(panel); mainFrame.setVisible(true); } }
Compile the program using command prompt. Go to D:/ > SWING and type the following command.
D:\SWING>javac com\tutorialspoint\gui\SwingLayoutDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\SWING>java com.tutorialspoint.gui.SwingLayoutDemo
Verify the following output
![SWING FlowLayout](/swing/images/swing_flowlayout.jpg)