Init commit.

src/lec17/ex1/Main.java

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+package lec17.ex1;
+
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.SwingConstants;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+
+public class Main {
+
+	public static void main(String[] args) {
+		JFrame main_frame = new JFrame();
+		main_frame.setTitle("Hello, World");
+		main_frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		JPanel main_panel = new JPanel();
+		main_frame.setContentPane(main_panel);
+
+		main_panel.setLayout(new BorderLayout());
+
+		JLabel hello_world_label = new JLabel("Hello, World!");
+		hello_world_label.setHorizontalAlignment(SwingConstants.CENTER);
+		hello_world_label.setForeground(Color.BLUE);
+		hello_world_label.setOpaque(true);
+		hello_world_label.setBackground(Color.YELLOW);
+
+		main_panel.add(hello_world_label, BorderLayout.CENTER);
+
+		main_frame.pack();
+		main_frame.setVisible(true);
+
+	}
+}

src/lec17/ex2/Main.java

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+package lec17.ex2;
+
+import javax.swing.*;
+
+public class Main {
+
+	public static void main(String[] args) {
+		int choice = JOptionPane.showConfirmDialog(null, "Is it safe?");
+		System.out.println("You chose: " + choice);
+
+		String input = JOptionPane.showInputDialog("What say you?");
+
+		JOptionPane.showMessageDialog(null, "You said: " + input);
+		System.out.println("Done");
+	}
+}

src/lec17/ex3/ButtonResponder.java

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+package lec17.ex3;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.*;
+
+public class ButtonResponder implements ActionListener {
+
+	private JLabel target;
+
+	public ButtonResponder(JLabel target_label) {
+		target = target_label;
+	}
+
+	public void actionPerformed(ActionEvent e) {
+		String command = e.getActionCommand();
+		if (command.equals("hello")) {
+			target.setText("Hello!");
+		} else if (command.equals("bye")) {
+			target.setText("Bye!");
+		} else if (command.equals("yes")) {
+			target.setText("Yes!");
+		}
+
+	}
+}

src/lec17/ex3/Main.java

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+package lec17.ex3;
+
+import java.awt.BorderLayout;
+import java.awt.GridLayout;
+import java.awt.Color;
+
+import javax.swing.JFrame;
+import javax.swing.JButton;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.SwingConstants;
+
+public class Main {
+	public static void main(String[] args) {
+		JFrame main_frame = new JFrame();
+		main_frame.setTitle("Button Example");
+		main_frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		main_frame.setSize(300, 100);
+
+		JPanel main_panel = new JPanel();
+		main_frame.setContentPane(main_panel);
+
+		main_panel.setLayout(new BorderLayout());
+
+		JLabel my_label = new JLabel("");
+		my_label.setHorizontalAlignment(SwingConstants.CENTER);
+		my_label.setForeground(Color.BLUE);
+		my_label.setOpaque(true);
+		my_label.setBackground(Color.YELLOW);
+
+		main_panel.add(my_label, BorderLayout.CENTER);
+
+		JPanel button_panel = new JPanel();
+		button_panel.setLayout(new GridLayout(1,3));
+
+		ButtonResponder responder = new ButtonResponder(my_label);
+
+		JButton b1 = new JButton("Say Hello");
+		b1.setActionCommand("hello");
+		b1.addActionListener(responder);
+		button_panel.add(b1);
+
+		JButton b2 = new JButton("Say Bye");
+		b2.setActionCommand("bye");
+		b2.addActionListener(responder);
+		button_panel.add(b2);
+
+		JButton b3 = new JButton("Say Yes");
+		b3.setActionCommand("yes");
+		b3.addActionListener(responder);
+		button_panel.add(b3);
+
+		main_panel.add(button_panel, BorderLayout.SOUTH);
+		main_frame.pack();
+		main_frame.setVisible(true);
+	}
+}

src/lec17/ex4/v1/ColorChooser.java

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+package lec17.ex4.v1;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.GridLayout;
+
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSlider;
+import javax.swing.SwingConstants;
+
+public class ColorChooser extends JPanel {
+
+	private Color color;
+	private JSlider red_slider;
+	private JSlider green_slider;
+	private JSlider blue_slider;
+	private JLabel color_label;
+
+	public ColorChooser(Color init_color) {
+		color = init_color;
+
+		setLayout(new BorderLayout());
+
+		JPanel slider_panel = new JPanel();
+		slider_panel.setLayout(new GridLayout(3,1));
+
+		red_slider = new JSlider(0, 255, init_color.getRed());
+		green_slider = new JSlider(0, 255, init_color.getGreen());
+		blue_slider = new JSlider(0, 255, init_color.getBlue());
+
+		Dimension slider_dim = new Dimension(200,20);
+		red_slider.setPreferredSize(slider_dim);
+		green_slider.setPreferredSize(slider_dim);
+		blue_slider.setPreferredSize(slider_dim);
+
+		slider_panel.add(red_slider);
+		slider_panel.add(green_slider);
+		slider_panel.add(blue_slider);
+
+		add(slider_panel, BorderLayout.SOUTH);
+
+		color_label = new JLabel(init_color.toString());
+		color_label.setBackground(this.color);
+		color_label.setOpaque(true);
+		color_label.setPreferredSize(new Dimension(200, 40));
+		color_label.setHorizontalAlignment(SwingConstants.CENTER);
+
+		add(color_label, BorderLayout.CENTER);
+	}
+
+	public ColorChooser() {
+		this(Color.GREEN);
+	}
+
+	public Color getColor() {
+		return color;
+	}
+}

src/lec17/ex4/v1/Main.java

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+package lec17.ex4.v1;
+
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.SwingConstants;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+
+public class Main {
+
+	public static void main(String[] args) {
+		JFrame main_frame = new JFrame();
+		main_frame.setTitle("Color Picker");
+		main_frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		JPanel main_panel = new JPanel();
+		main_frame.setContentPane(main_panel);
+
+		main_panel.setLayout(new BorderLayout());
+
+		ColorChooser color_chooser = new ColorChooser();		
+		main_panel.add(color_chooser, BorderLayout.CENTER);
+
+		main_frame.pack();
+		main_frame.setVisible(true);
+	}
+}

src/lec17/ex4/v2/ColorChooser.java

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+package lec17.ex4.v2;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.GridLayout;
+
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSlider;
+import javax.swing.SwingConstants;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+
+public class ColorChooser extends JPanel implements ChangeListener {
+
+	Color color;
+	JSlider red_slider;
+	JSlider green_slider;
+	JSlider blue_slider;
+	JLabel color_label;
+
+	public ColorChooser(Color init_color) {
+		color = init_color;
+
+		setLayout(new BorderLayout());
+
+		JPanel slider_panel = new JPanel();
+		slider_panel.setLayout(new GridLayout(3,1));
+
+		red_slider = new JSlider(0, 255, init_color.getRed());
+		green_slider = new JSlider(0, 255, init_color.getGreen());
+		blue_slider = new JSlider(0, 255, init_color.getBlue());
+
+		red_slider.setPreferredSize(new Dimension(200, 20));
+		green_slider.setPreferredSize(new Dimension(200, 20));
+		blue_slider.setPreferredSize(new Dimension(200, 20));
+
+		slider_panel.add(red_slider);
+		slider_panel.add(green_slider);
+		slider_panel.add(blue_slider);
+
+		add(slider_panel, BorderLayout.SOUTH);
+
+		color_label = new JLabel(init_color.toString());
+		color_label.setBackground(this.color);
+		color_label.setOpaque(true);
+		color_label.setPreferredSize(new Dimension(200, 40));
+		color_label.setHorizontalAlignment(SwingConstants.CENTER);
+
+		add(color_label, BorderLayout.CENTER);
+
+		red_slider.addChangeListener(this);
+		green_slider.addChangeListener(this);
+		blue_slider.addChangeListener(this);
+	}
+
+	public ColorChooser() {
+		this(Color.GREEN);
+	}
+
+	public Color getColor() {
+		return color;
+	}
+
+	@Override
+	public void stateChanged(ChangeEvent e) {
+		color = new Color(red_slider.getValue(),
+				          green_slider.getValue(),
+				          blue_slider.getValue());
+		color_label.setText(color.toString());
+		color_label.setBackground(color);
+	}
+}

src/lec17/ex4/v2/Main.java

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+package lec17.ex4.v2;
+
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.SwingConstants;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+
+public class Main {
+
+	public static void main(String[] args) {
+		JFrame main_frame = new JFrame();
+		main_frame.setTitle("Color Picker");
+		main_frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		JPanel main_panel = new JPanel();
+		main_frame.setContentPane(main_panel);
+
+		main_panel.setLayout(new BorderLayout());
+
+		ColorChooser color_chooser = new ColorChooser();		
+		main_panel.add(color_chooser, BorderLayout.CENTER);
+
+		main_frame.pack();
+		main_frame.setVisible(true);
+	}
+}