add 2-2-JavaGUI examples

java/2-2-JavaGUI/BasicForm1.java

+
+import javax.swing.*;
+
+// Create a simple form
+public class BasicForm1 {
+    public static void main(String[] args) {
+        // create a window
+        JFrame frame = new JFrame("Window Demo");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        // create a panel and add components
+        JPanel panel = new JPanel();
+        JButton button = new JButton("Ok");
+        panel.add(button);
+
+        // add panel to the window
+        frame.add(panel);
+
+        // set window behaviour and display it
+        frame.setResizable(false);
+        frame.setSize(200, 200);
+        // frame.pack();
+        frame.setVisible(true);
+    }
+}
+

java/2-2-JavaGUI/BasicForm2.java

+
+import javax.swing.*;
+import javax.swing.event.MouseInputListener;
+import java.awt.event.MouseEvent;
+
+// Create a simple form
+// Adds a listener
+public class BasicForm2 {
+
+    public static void main(String[] args) {
+        // create a window
+        JFrame frame = new JFrame("Window Demo");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        // create a panel and add components
+        JPanel panel = new JPanel();
+        JButton button = new JButton("Ok");
+        button.addMouseListener(new MyMouseListener());
+        panel.add(button);
+
+        // add panel to the window
+        frame.add(panel);
+
+        // set window behaviour and display it
+        frame.setResizable(false);
+        frame.setSize(200, 200);
+        // frame.pack();
+        frame.setVisible(true);
+    }
+
+    // create a custom listener for my ok button
+    static class MyMouseListener implements MouseInputListener  {
+        @Override
+        public void mouseClicked(MouseEvent e) {
+            System.exit(1);
+        }
+
+        @Override
+        public void mousePressed(MouseEvent e) { }
+
+        @Override
+        public void mouseReleased(MouseEvent e) { }
+
+        @Override
+        public void mouseEntered(MouseEvent e) { }
+
+        @Override
+        public void mouseExited(MouseEvent e) { }
+
+        @Override
+        public void mouseDragged(MouseEvent e) { }
+
+        @Override
+        public void mouseMoved(MouseEvent e) { }
+    }
+}
\ No newline at end of file

java/2-2-JavaGUI/BasicForm3.java

+
+import javax.swing.*;
+import javax.swing.event.MouseInputListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionListener;
+
+// Create a simple form
+// Converts listener to adapter
+public class BasicForm3 {
+
+    public static void main(String[] args) {
+        // create a window
+        JFrame frame = new JFrame("Window Demo");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        // create a panel and add components
+        JPanel panel = new JPanel();
+        JButton button = new JButton("Ok");
+        button.addMouseListener(new MyMouseAdapter());
+        panel.add(button);
+
+        // add panel to the window
+        frame.add(panel);
+
+        // set window behaviour and display it
+        frame.setResizable(false);
+        frame.setSize(200, 200);
+        // frame.pack();
+        frame.setVisible(true);
+    }
+
+    // create a custom adapter from MouseAdapter base class
+    static class MyMouseAdapter extends MouseAdapter {
+        public void mouseClicked(MouseEvent e) {
+            System.exit(1);
+        }
+    }
+}
+

java/2-2-JavaGUI/BasicForm4.java

+
+import javax.swing.*;
+import javax.swing.event.MouseInputListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseMotionListener;
+
+// Create a simple form
+// Converts adapter to anonymous inner class
+public class BasicForm4 {
+
+    public static void main(String[] args) {
+        // create a window
+        JFrame frame = new JFrame("Window Demo");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        // create a panel and add components
+        JPanel panel = new JPanel();
+        JButton button = new JButton("Ok");
+        button.addMouseListener(new MouseAdapter() { 
+                public void mouseClicked(MouseEvent e) {        // use anonymous inner class instead of MyMouseAdapter class
+                    System.exit(1);
+        }});
+        panel.add(button);
+
+        // add panel to the window
+        frame.add(panel);
+
+        // set window behaviour and display it
+        frame.setResizable(false);
+        frame.setSize(200, 200);
+        // frame.pack();
+        frame.setVisible(true);
+    }
+
+// We do not need to implement a custom adapter
+/*    // create a custom adapter from MouseAdapter base class
+    static class MyMouseAdapter extends MouseAdapter {
+        public void mouseClicked(MouseEvent e) {
+            System.exit(1);
+        }
+    }*/
+}
+

java/2-2-JavaGUI/SimpleDraw.java

+import javax.swing.*;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.BasicStroke;
+import java.awt.RenderingHints;
+
+
+
+// JComponent is a base class for custom components 
+public class SimpleDraw extends JComponent {
+
+    public static void main(String[] args) {
+        JFrame f = new JFrame("SimpleDraw"); // jframe is the app window
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(400, 400); // window size
+
+        SimpleDraw canvas = new SimpleDraw();
+        f.setContentPane(canvas); // add canvas to jframe
+        f.setVisible(true); // show the window
+    }
+
+    // Constructor for SimpleDraw
+    public SimpleDraw() {
+    }
+
+    // custom graphics drawing 
+    // this is a method that we overrode from the JComponent class
+    public void paintComponent(Graphics g) {
+        Graphics2D g2 = (Graphics2D) g;               // 2D drawing
+        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+        					RenderingHints.VALUE_ANTIALIAS_ON);
+        g2.setStroke(new BasicStroke(32));           // 32 pixels wide
+        g2.setColor(Color.BLUE);                     // make it blue
+        g2.drawLine(0, 0, getWidth(), getHeight());  // draw line 
+        g2.setColor(Color.RED);
+        g2.drawLine(getWidth(), 0, 0, getHeight());  
+    }
+}
+

java/2-2-JavaGUI/SimpleDraw2.java

+import javax.swing.*;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.BasicStroke;
+import java.awt.RenderingHints;
+import java.awt.event.*;
+
+
+// JComponent is a base class for custom components 
+public class SimpleDraw2 extends JComponent {
+
+    public static void main(String[] args) {
+        JFrame f = new JFrame("SimpleDraw"); // jframe is the app window
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(400, 400); // window size
+
+        SimpleDraw2 canvas = new SimpleDraw2();
+        f.setContentPane(canvas); // add canvas to jframe
+        f.setVisible(true); // show the window
+    }
+
+    // Object properties
+    private int mouseX;
+    private int mouseY;
+
+    // Constructor for SimpleDraw
+    public SimpleDraw2() {
+	   this.addMouseMotionListener( new MyMotionListener() );
+    }
+
+    // custom graphics drawing 
+    public void paintComponent(Graphics g) {
+        Graphics2D g2 = (Graphics2D) g; // cast to get 2D drawing methods
+        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,  // antialiasing look nicer
+        					RenderingHints.VALUE_ANTIALIAS_ON);
+        g2.setStroke(new BasicStroke(32)); // 32 pixel thick stroke
+        g2.setColor(Color.BLUE); // make it blue
+        g2.drawLine(0, 0, getWidth(), getHeight());  // draw line 
+        g2.setColor(Color.RED);
+        g2.drawLine(getWidth(), 0, 0, getHeight());  
+
+    	String label = "Mouse at (" + mouseX + ", " + mouseY + ")";
+        g2.setColor(Color.BLACK);
+        g2.drawString(label, 130, 40);
+    }
+
+    // Inner class for handling mouse motion events
+    private class MyMotionListener implements MouseMotionListener {
+        public void mouseMoved(MouseEvent e) {
+            mouseX = e.getX();
+            mouseY = e.getY();
+            repaint();
+        }
+
+        public void mouseDragged(MouseEvent e) {
+	    // Do nothing.
+	    // But we still need this method implemented because it's part of the interface
+        }
+    }
+}

java/2-2-JavaGUI/SimpleDraw3.java

+import javax.swing.*;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.BasicStroke;
+import java.awt.RenderingHints;
+import java.awt.event.*;
+
+
+// JComponent is a base class for custom components 
+public class SimpleDraw3 extends JComponent {
+
+    public static void main(String[] args) {
+        JFrame f = new JFrame("SimpleDraw"); // jframe is the app window
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(400, 400); // window size
+
+        SimpleDraw3 canvas = new SimpleDraw3();
+        f.setContentPane(canvas); // add canvas to jframe
+        f.setVisible(true); // show the window
+    }
+
+    // Object properties
+    private int mouseX;
+    private int mouseY;
+
+    // Constructor for SimpleDraw
+    public SimpleDraw3() {
+	   this.addMouseMotionListener( new MyMotionListener() );
+    }
+
+    // custom graphics drawing 
+    public void paintComponent(Graphics g) {
+        Graphics2D g2 = (Graphics2D) g; // cast to get 2D drawing methods
+        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,  // antialiasing look nicer
+        					RenderingHints.VALUE_ANTIALIAS_ON);
+        g2.setStroke(new BasicStroke(32)); // 32 pixel thick stroke
+        g2.setColor(Color.BLUE); // make it blue
+        g2.drawLine(0, 0, getWidth(), getHeight());  // draw line 
+        g2.setColor(Color.RED);
+        g2.drawLine(getWidth(), 0, 0, getHeight());  
+
+	    String label = "Mouse at (" + mouseX + ", " + mouseY + ")";
+        g2.setColor(Color.BLACK);
+    	g2.drawString(label, 130, 40);
+    }
+
+    // Inner class for handling mouse motion events
+    private class MyMotionListener extends MouseMotionAdapter {
+        public void mouseMoved(MouseEvent e) {
+            mouseX = e.getX();
+            mouseY = e.getY();
+            repaint();
+        }
+
+        // Notice the difference? 
+        // We implemented the MotionListener using an adapter instead of an interface
+        // This allows is to ignore methods we don't want!
+
+        /*
+        public void mouseDragged(MouseEvent e) {
+	    // Do nothing.
+	    // But we still need this method implemented because it's part of the interface
+        }
+        */
+    }
+}

java/2-2-JavaGUI/SimpleDraw4.java

+import javax.swing.*;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.BasicStroke;
+import java.awt.RenderingHints;
+import java.awt.event.*;
+import java.util.Vector;
+
+// JComponent is a base class for custom components 
+public class SimpleDraw4 extends JComponent {
+
+    public static void main(String[] args) {
+        JFrame f = new JFrame("SimpleDraw"); // jframe is the app window
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(400, 400); // window size
+        
+        SimpleDraw4 canvas = new SimpleDraw4();
+        f.setContentPane(canvas); // add canvas to jframe
+        f.setVisible(true); // show the window
+    }
+
+    // Object properties
+    private int mouseX;
+    private int mouseY;
+
+    // Constructor for SimpleDraw
+    public SimpleDraw4() {
+
+        // this is an example of an anonymous inner class
+    	this.addMouseMotionListener( new MouseAdapter() {
+          public void mouseMoved(MouseEvent e) {
+            mouseX = e.getX();
+            mouseY = e.getY();
+            repaint();
+          }
+	});
+    }
+
+    // custom graphics drawing 
+    public void paintComponent(Graphics g) {
+        Graphics2D g2 = (Graphics2D) g; // cast to get 2D drawing methods
+        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,  // antialiasing look nicer
+        					RenderingHints.VALUE_ANTIALIAS_ON);
+        g2.setStroke(new BasicStroke(32)); // 32 pixel thick stroke
+        g2.setColor(Color.BLUE); // make it blue
+        g2.drawLine(0, 0, getWidth(), getHeight());  // draw line 
+        g2.setColor(Color.RED);
+        g2.drawLine(getWidth(), 0, 0, getHeight());  
+
+	    String label = "Mouse at (" + mouseX + ", " + mouseY + ")";
+        g2.setColor(Color.BLACK);
+	    g2.drawString(label, 130, 40);
+    }
+}

java/2-2-JavaGUI/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = "BasicForm1"
+
+all:
+	@echo "Compiling..."
+	javac *.java
+
+run: all
+	@echo "Running..."
+	java $(NAME)
+
+clean:
+	rm -rf $(NAME).class