![]() To determine whether the check box has been selected, use the following code:Ī) if (checkBox.doClick()) Because these components rely on the appearance and behavior of the underlying operating system components, there is little that can be done by the programmer to change their properties.ĭ) Container B) AWT Event listeners must:ī) exit the application once it has handled the eventĭ) implement an interface D) implement an interface How many radio buttons can be selected at the same time as the result of the following code? To click the radio button in code, use the following statement:ĭ) Click(radio, true) C) radio.doClick() Assume that the variable checkbox references a JCheckBox object. ![]() True/False False _ is a library of classes that do not replace _, but provide an improved alternative for creating GUI applications.ĭ) JFC, AWT C) Swing, AWT Assume that radio references a JRadioButton object. True/False False When a splash screen is displayed, the application does not load and execute until the user clicks the splash screen image with the mouse. All rights reserved.You must use the statement import java.swing.* in order to use the ItemListener interface. The rows in the grid aren't necessarily all the same height similarly, grid columns can have different widths.ġ995-2002 Sun Microsystems, Inc. This layout manager aligns components by placing them within a grid of cells, allowing some components to span more than one cell. GridBagLayout is the most sophisticated, flexible layout manager the Java platform provides. GridLayout simply makes a bunch of components equal in size and displays them in the requested number of rows and columns. This layout manager simply lays out components from left to right, starting new rows, if necessary. This class respects the components' requested maximum sizes and also lets you align components.įlowLayout is the default layout manager for every JPanel. The BoxLayout class puts components in a single row or column. All extra space is placed in the center area. A BorderLayout hasįive areas available to hold components: north, south, east, The content pane is the main container in allįrames, applets, and dialogs. Where to find more information in The Java Tutorial and API documentation.īorderLayout is the default layout manager for everyĬontent pane. Here's a quick summary of the various layout managers and So be sure toĬheck the API documentation for the layout manager for details. Manager that the panel or content pane is using. ![]() When you add components to a panel or a content pane, theĪrguments you specify to the add method depend on the layout For example, here's theĬode that makes a panel use BorderLayout: Just invoke theĬontainer's setLayout method. Pane uses, you can change it to a different one. If you don't like the default layout manager that a panel or content You create a JPanel or add components to a content pane. Panes (the main containers in JApplet, JDialog,Īnd JFrame objects) use BorderLayout by default.Īs a rule, the only time you have to think about layout managers is when Objects use a FlowLayout by default, whereas content The Java platform supplies five commonly used layout managers:īy default, every container has a layout manager. Managers to control the size and the position of the buttons. GUIs look so different? Because they use different layout The code for the programs is almost identical. The following figure shows the GUIs of five programs, each of Lesson: User Interfaces that Swing: A Quick Start Guide
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