init

imageprocessing/src/main/java/imagej/DrawRect.java

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+package imagej;
+
+import ij.IJ;
+import ij.ImagePlus;
+import ij.process.ImageProcessor;
+
+import java.awt.*;
+
+public class DrawRect {
+    public static void main(String[] args) {
+        ImagePlus imp = IJ.openImage(DrawRect.class.getClassLoader().getResource("lena.jpg").getPath());
+        drawRect(imp);
+        imp.show();
+    }
+
+    private static void drawRect(ImagePlus imp) {
+        ImageProcessor ip = imp.getProcessor();
+        ip.setColor(Color.BLUE);
+        ip.setLineWidth(4);
+        ip.drawRect(10, 10, imp.getWidth() - 20, imp.getHeight() - 20);
+    }
+}

imageprocessing/src/main/java/swing/DrawRect.java

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+package swing;
+
+import javax.imageio.ImageIO;
+import javax.swing.*;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+public class DrawRect {
+    public static void main(String[] args) throws IOException {
+        BufferedImage image  = loadImage();
+        drawRectangle(image);
+        displayImage(image);
+    }
+
+    private static BufferedImage loadImage() throws IOException {
+        String imagePath = DrawRect.class.getClassLoader().getResource("lena.jpg").getPath();
+        return ImageIO.read(new File(imagePath));
+    }
+
+    private static void drawRectangle(BufferedImage image) {
+        Graphics2D g = (Graphics2D) image.getGraphics();
+        g.setStroke(new BasicStroke(3));
+        g.setColor(Color.BLUE);
+        g.drawRect(10, 10, image.getWidth() - 20, image.getHeight() - 20);
+    }
+
+    private static void displayImage(BufferedImage image) {
+        JLabel picLabel = new JLabel(new ImageIcon(image));
+
+        JPanel jPanel = new JPanel();
+        jPanel.add(picLabel);
+
+        JFrame f = new JFrame();
+        f.setSize(new Dimension(image.getWidth(), image.getHeight()));
+        f.add(jPanel);
+        f.setVisible(true);
+    }
+}