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The following example creates a Swing application that sets the layout manager of the content pane of the JFrame instance to flow layout It then creates two buttons (which are instances of JButton) and a label, and adds them to the frame In this example, the buttons have no effect and are for display purposes only (See Create a Simple Push Button for a recipe that demonstrates buttons)
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// Change the Content Pane's layout manager import javaxswing*; import javaawt*; class ChangeLayout { ChangeLayout() { // Create a new JFrame container JFrame jfrm = new JFrame("Use FlowLayout"); // Give the frame an initial size jfrmsetSize(275, 100);
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// Set the layout manager to FlowLayout jfrmsetLayout(new FlowLayout()); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create a label JLabel jlab = new JLabel("A sample of flow layout"); // Create do-nothing buttons JButton jbtnA = new JButton("Alpha"); JButton jbtnB = new JButton("Beta"); // Add the buttons and label to the content pane jfrmadd(jbtnA); jfrmadd(jbtnB); jfrmadd(jlab); // Display the frame jfrmsetVisible(true); } public static void main(String args[]) { // Create the frame on the event dispatching thread SwingUtilitiesinvokeLater(new Runnable() { public void run() { new ChangeLayout(); } }); } }
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As stated, when using flow layout, the position of the components may change when the frame is resized For example, making the frame wider causes the buttons and label to be positioned in-line, as shown here:
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By default, FlowLayout centers components within a line and separates each component from the next with five pixels You can alter these defaults by using one of the following FlowLayout constructors: FlowLayout(int horizAlign) FlowLayout(int horizAlign, int horizSep, int vertSep) The horizontal alignment of components within a line is specified by horizAlign It must be one of these values:
FlowLayoutCENTER FlowLayoutRIGHT FlowLayoutLEADING FlowLayoutTRAILING FlowLayoutLEFT
By default, the values LEADING and TRAILING are the same as LEFT and RIGHT They will be reversed in containers whose orientation is set up for languages that read right to left, rather than left to right The horizontal and vertical spacing between components is specified in pixels by horizSep and vertSep, respectively To see the effect of changing the alignment and the spacing, substitute this call to setLayout( ) into the example
jfrmsetLayout(new FlowLayout(FlowLayoutRIGHT, 20, 5));
This right-justifies each line and uses a 20-pixel horizontal spacing In addition to BorderLayout and FlowLayout, Java supplies several others that are commonly used Three that you will want to experiment with are GridLayout, GridBagLayout, and BoxLayout Each is briefly described here GridLayout creates a grid of rectangular cells into which individual components are placed The number of rows and columns in the grid is specified when the layout is created The size of each cell in the grid is the same, and a component put into a cell is sized to fill the dimensions of the cell GridLayout is packaged in javaawt GridBagLayout is, in essence, a collection of grids With GridBagLayout you can specify the relative placement of components by specifying their positions within cells inside each grid The key is that each component can be a different size, and each row in the grid can have a different number of columns This scheme gives you considerable control over how components are arranged within a container Although GridBagLayout requires a bit of work to set up, it is often worth the effort when creating a frame that contains several controls GridBagLayout is also packaged in javaawt An alternative to GridBagLayout that is easier to use in some cases is BoxLayout It lets you easily create a group of components that are laid out either vertically or horizontally as a unit BoxLayout is not often used as the layout manager for the content pane Rather, it is used as the layout manager for one or more panels (such as instances of JPanel) Components are then added to these panels, and then the panels are added to the content pane (The easiest way to obtain a container that uses BoxLayout is to create a Box See Use JScrollPane to Handle Scrolling for an example that uses Box)
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