và điều này được lưu trữ trong biến đếm. Việc thiếu một từ khóa tĩnh ở phía trước của một tên phương pháp làm cho nó một phương pháp dụ. Phương pháp sơ thẩm hoạt động trong một đối tượng cụ thể, chứ không phải là một lớp học của các đối tượng. Vào ngày 1, "Bắt đầu với Java, bạn tạo ra một thể hiện | 270 SimpcTPDF Me rgeh ancfSplit Unregistered Version - http Q A Q Is there a way to change the font of text that appears on a button and other components A The JComponent class includes a setFont Font method that can be used to set the font for text displayed on that component. You will work with Font objects color and more graphics on Day 13 Using Color Fonts and Graphics. Q How can I find out what components are available in Swing and how to use them A This is the first of two days spent introducing user interface components so you will learn more about them tomorrow. If you have web access you can find out what classes are in the Swing package by visiting Sun s online documentation for Java at the web address http javase 6 docs api. Q The last version of Java used the Metal look and feel. How can I continue using this instead of Ocean A You ll learn how to do this in a Java class on Day 10. There s also a system property you can specify that will cause the interpreter to use the Metal look and feel by default instead of Ocean. This property should have the value steel to switch back to Metal as in the following command java steel Authenticator Running this command causes the Authenticator application to be displayed in the Metal look and feel. Quiz Review today s material by taking this three-question quiz. Questions 1. Which of the following user interface components is not a container a. JScrollPane b. JTextArea c. JWindow Simpo PDF Merge and Split Unregistered Version - http 2. Which container does not require the use of a content pane when adding components to it a. JPanel b. JWindow c. JFrame 3. If you use setSize on an application s main frame or window where will it appear on your desktop a. At the center of the desktop b. At the same spot the last application appeared c. At the upper-left corner of the desktop Answers 1. b. A JTextArea requires a container to support .
