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();
+			}
+		});
+	}
+}

lab/lab10/Question2/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;
+import java.awt.FlowLayout;
+import javax.swing.JButton;
+
+public class MyFrame extends JFrame {
+	// add two buttons with different text
+	private JButton button1 = new JButton("Button 1");
+	private JButton button2 = new JButton("Button 2");
+
+	public MyFrame() {
+		setSize(400, 300);
+		setTitle("MyFrame");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		setLocationRelativeTo(null);
+
+		// set the layout of the frame
+		setLayout(new FlowLayout(FlowLayout.LEFT, 20, 40));
+
+		// add the buttons to the frame
+		add(button1);
+		add(button2);
+
+		setVisible(true);
+	}
+}

lab/lab10/Question2/Start.java

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+/**
+ * Answer to question.
+ *
+ * -Q: Instead of adding to the frame two different buttons, add twice the same
+ * button object. Run the program. What happens?
+ *
+ * -A: Only one button is added to the frame.
+ *
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab10/Question3/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 java.awt.FlowLayout;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JRadioButton;
+import javax.swing.JTextField;
+import javax.swing.JButton;
+import javax.swing.JCheckBox;
+import javax.swing.JComboBox;
+
+public class MyFrame extends JFrame {
+
+	public MyFrame() {
+		setSize(400, 300);
+		setTitle("MyFrame");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		setLocationRelativeTo(null);
+
+		// set the layout of the frame
+		setLayout(new FlowLayout(FlowLayout.LEFT, 20, 40));
+
+		// add the buttons to the frame
+		add(new JButton("Button 1"));
+		add(new JButton("Button 2"));
+
+		JLabel l = new JLabel("Enter your name: ");
+		JTextField tx = new JTextField("Type Text Here");
+		JCheckBox cb = new JCheckBox("I agree");
+		JRadioButton rb = new JRadioButton("Yes");
+		JComboBox<String> cb1 = new JComboBox<String>(new String[] { "Red", "Green", "Blue" });
+		JComboBox<Integer> cb2 = new JComboBox<Integer>(new Integer[] { 2, 7, -3, 24 });
+		// add the components to the frame
+		add(l);
+		add(tx);
+		add(cb);
+		add(rb);
+		add(cb1);
+		add(cb2);
+
+		setVisible(true);
+	}
+}

lab/lab10/Question3/Start.java

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+/**
+ * Answer to question.
+ *
+ * - Q: Also use the mouse to resize the frame and check what happens with the components.
+ *
+ * - A: The frame is resized and the components are repositioned.
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab10/Question4/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 java.awt.BorderLayout;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JRadioButton;
+import javax.swing.JTextField;
+import javax.swing.JButton;
+import javax.swing.JCheckBox;
+import javax.swing.JComboBox;
+
+public class MyFrame extends JFrame {
+
+	public MyFrame() {
+		setSize(400, 300);
+		setTitle("MyFrame");
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		setLocationRelativeTo(null);
+
+		// set the layout of the frame
+		setLayout(new BorderLayout());
+
+		// add the buttons to the frame
+		add(new JButton("Button 1"));
+		add(new JButton("Button 2"));
+
+		JLabel l = new JLabel("Enter your name: ");
+		JTextField tx = new JTextField("Type Text Here");
+		JCheckBox cb = new JCheckBox("I agree");
+		JRadioButton rb = new JRadioButton("Yes");
+		JComboBox<String> cb1 = new JComboBox<String>(new String[] { "Red", "Green", "Blue" });
+		JComboBox<Integer> cb2 = new JComboBox<Integer>(new Integer[] { 2, 7, -3, 24 });
+		// add the components to the frame
+		add(l, BorderLayout.PAGE_START);
+		add(tx, BorderLayout.LINE_START);
+		add(cb, BorderLayout.CENTER);
+		add(rb, BorderLayout.LINE_END);
+		add(cb1, BorderLayout.PAGE_END);
+		add(cb2);
+
+		setVisible(true);
+	}
+}

lab/lab10/Question4/Start.java

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+/**
+ * Answer to question.
+ *
+ * - Q: What happens when you run the program?
+ *
+ * - A: The layout change to 2 columns. Direction is LTR. The program change the
+ * layout to my desired, the layout use the number of columns that I specified.
+ *
+ * - Q: Use the mouse to resize the frame. Does the layout change?
+ *
+ * - A: No, the layout doesn't change.
+ *
+ * - Q: Set the number of rows to zero in the grid layout manager and try again.
+ * What happens?
+ *
+ * - A: BOOM SHAKARAKA!
+ *
+ * - Q: What happens when you add more than one component to one of the five
+ * areas of the frame? What happens when one of the five areas does not contain
+ * any component?
+ *
+ * - A: The component will overlapping.
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab10/Question5/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 java.awt.BorderLayout;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JRadioButton;
+import javax.swing.JTextField;
+import javax.swing.JButton;
+import javax.swing.JCheckBox;
+import javax.swing.JComboBox;
+import javax.swing.JPanel;
+import java.awt.Color;
+import java.awt.FlowLayout;
+import java.awt.GridLayout;
+
+public class MyFrame extends JFrame {
+
+	public MyFrame() {
+		setTitle("MyFrame");
+		setSize(400, 300);
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		// center the frame
+		setLocationRelativeTo(null);
+
+		setLayout(new BorderLayout());
+
+		// first panel
+		JPanel p1 = new JPanel();
+		p1.setLayout(new BorderLayout(10, 10));
+		p1.setBackground(Color.BLUE);
+		// second panel
+		JPanel p2 = new JPanel();
+		p2.setLayout(new FlowLayout());
+		p2.setBackground(Color.GREEN);
+		// third panel
+		JPanel p3 = new JPanel();
+		p3.setLayout(new GridLayout(2, 2, 2, 2));
+		// add panel to frame
+		add(p1, BorderLayout.PAGE_START);
+		add(p2, BorderLayout.CENTER);
+		add(p3, BorderLayout.PAGE_END);
+
+		// tow button in the first panel
+		JButton b1 = new JButton("Button1");
+		p1.add(BorderLayout.LINE_START, b1);
+		JButton b2 = new JButton("Button2");
+		p1.add(BorderLayout.LINE_END, b2);
+
+		// two label in the second panel
+		JLabel l = new JLabel("Enter your name: ");
+		p2.add(l);
+		JTextField tx = new JTextField("Type Text Here");
+		p2.add(tx);
+
+		// checkboxs in the third panel
+		JCheckBox cb = new JCheckBox("I agree");
+		p3.add(cb);
+		JRadioButton rb = new JRadioButton("Yes");
+		p3.add(rb);
+		JComboBox<String> cb1 = new JComboBox<String>(new String[] { "Red", "Green", "Blue" });
+		p3.add(cb1);
+		JComboBox<Integer> cb2 = new JComboBox<Integer>(new Integer[] { 2, 7, -3, 24 });
+		p3.add(cb2);
+
+		setVisible(true);
+	}
+}

lab/lab10/Question5/Start.java

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+/**
+ * Answer to question.
+ *
+ * - Q: What happens when you run the program?
+ *
+ * - A: The layout change to 2 columns. Direction is LTR. The program change the
+ * layout to my desired, the layout use the number of columns that I specified.
+ *
+ * - Q: Use the mouse to resize the frame. Does the layout change?
+ *
+ * - A: No, the layout doesn't change.
+ *
+ * - Q: Set the number of rows to zero in the grid layout manager and try again.
+ * What happens?
+ *
+ * - A: BOOM SHAKARAKA!
+ *
+ * - Q: What happens when you add more than one component to one of the five
+ * areas of the frame? What happens when one of the five areas does not contain
+ * any component?
+ *
+ * - A: The component will overlapping.
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab10/Question6/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 java.awt.BorderLayout;
+import javax.swing.JFrame;
+
+public class MyFrame extends JFrame {
+
+	public MyFrame() {
+		setTitle("MyFrame");
+		setSize(400, 300);
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		// center the frame
+		setLocationRelativeTo(null);
+
+		setLayout(new BorderLayout());
+
+		// my draw panel
+		add(new MyPanel());
+
+		setVisible(true);
+	}
+}

lab/lab10/Question6/MyPanel.java

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+import java.awt.Color;
+import java.awt.Graphics;
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	@Override
+	protected void paintComponent(Graphics g) {
+		// clean the panel
+		super.paintComponent(g);
+		// draw
+		g.setColor(Color.RED);
+		g.drawString("hello", (int) Math.round(Math.random() * this.getWidth()),
+				(int) Math.round(Math.random() * this.getHeight()));
+	}
+}

lab/lab10/Question6/Start.java

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+/**
+ * Answer to question.
+ *
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}

lab/lab10/Question7/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 java.awt.BorderLayout;
+import javax.swing.JFrame;
+
+public class MyFrame extends JFrame {
+
+	public MyFrame() {
+		setTitle("MyFrame");
+		setSize(400, 300);
+		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		// center the frame
+		setLocationRelativeTo(null);
+
+		setLayout(new BorderLayout());
+
+		// my draw panel
+		add(new MyPanel());
+
+		setVisible(true);
+	}
+}

lab/lab10/Question7/MyPanel.java

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+import java.awt.Color;
+import java.awt.Graphics;
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	@Override
+	protected void paintComponent(Graphics g) {
+		// clean the panel
+		super.paintComponent(g);
+		// draw
+		g.setColor(Color.RED);
+
+		g.drawRect(30, 30, 60, 60);
+		g.drawRect(15, 40, 60, 60);
+		g.drawLine(30, 30, 15, 40);
+		g.drawLine(90, 30, 75, 40);
+		g.drawLine(90, 90, 75, 100);
+		g.drawLine(30, 90, 15, 100);
+		// use g to draw a Cylinder
+		g.setColor(Color.BLUE);
+		g.drawOval(120, 20, 60, 20);
+		g.drawLine(120, 30, 120, 90);
+		g.drawLine(180, 30, 180, 90);
+		g.drawOval(120, 80, 60, 20);
+
+	}
+}

lab/lab10/Question7/Start.java

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+/**
+ * Answer to question.
+ *
+ */
+public class Start {
+	public static void main(String[] args) {
+		// Dispather
+		javax.swing.SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				new MyFrame();
+			}
+		});
+	}
+}