lab10

lab/lab10/Question1/MyFrame.java

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+/*
+ * Author: CHEN Yongyuan (Walter) from OOP(1007)
+ * Date: 2022-05-01
+ * Description: This is the Main Frame class.
+ */
+
+import javax.swing.JFrame;
+
+public class MyFrame extends JFrame {
+	public MyFrame() {
+		setSize(400, 300);
+		setTitle("MyFrame");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		setLocationRelativeTo(null);
+		setVisible(true);
+	}
+}

lab/lab10/Question1/Start.java

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+/**
+ * Answer to question.
+ *
+ * - Q: In the constructor of the MyFrame class, comment out the call to the
+ * setTitle method. Run the program. What happens? Then undo the commenting out.
+ *
+ * - A: The title will become empty.
+ *
+ * - Q: Comment out the call to the setSize method. Run the program. What
+ * happens? Then undo the commenting out
+ *
+ * - A: Yes the program is still running. Because the "close windows" event is
+ * not linked to the program ended event. So the program won't known the windows
+ * is closed and will continue running.
+ * 
+ * - Q: Comment out the call to the setVisible method. Run the program. What
+ * happens?
+ *
+ * - A: Frame will not show and program will end.
+ *
+ * - Q: In a line before the call to the setVisible method, add a call to the
+ * setLocationRelativeTo method of the frame and give it an argument of null.
+ * Run the program. What happens?
+ *
+ * - A: The frame will show in the center of the screen. But did not work as
+ * expected while using mutiple screen and x11-wayland or wayland platform.
+ *
+ * - Q: In the run method of the anonymous class inside the Start class, add a
+ * second MyFrame object. Run the program. What happens? (Use the mouse to move
+ * the frame to check what happens!) What happens when you close one of the
+ * two frames? Then undo the change in the run method.
+ *
+ * - A: Two frame will show in the screen. If one of the frame is closed, the
+ * both frame will be closed. Because they are connnect to the same event.
+ *
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}