Tiny File Manager

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import java.awt.Container;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class DrawSketch extends JPanel implements MouseMotionListener {

private static final int recW = 14;
    private static final int MAX = 100;
    private Rectangle[] rect = new Rectangle[MAX];
    private int numOfRecs = 0;
    private int currentSquareIndex = -1;

public DrawSketch() {

addMouseListener(new MouseAdapter() {

@Override

public void mousePressed(MouseEvent evt) {

int x = evt.getX();

int y = evt.getY();

currentSquareIndex = getRec(x, y);

if (currentSquareIndex < 0) // not inside a square

{

add(x, y);

}

@Override

public void mouseClicked(MouseEvent evt) {

int x = evt.getX();

int y = evt.getY();

if (evt.getClickCount() >= 2) {

remove(currentSquareIndex);

}

});

addMouseMotionListener(this);
    }

@Override
    public void paintComponent(Graphics g) {

super.paintComponent(g);

for (int i = 0; i < numOfRecs; i++) {

((Graphics2D) g).draw(rect[i]);

}
    }

public int getRec(int x, int y) {

for (int i = 0; i < numOfRecs; i++) {

if (rect[i].contains(x, y)) {

return i;

}

return -1;
    }

public void add(int x, int y) {

if (numOfRecs < MAX) {

rect[numOfRecs] = new Rectangle(x, y, recW, recW);

currentSquareIndex = numOfRecs;

numOfRecs++;

repaint();

}
    }

@Override
    public void remove(int n) {

if (n < 0 || n >= numOfRecs) {

return;

}

numOfRecs--;

rect[n] = rect[numOfRecs];

if (currentSquareIndex == n) {

currentSquareIndex = -1;

}

repaint();
    }

@Override
    public void mouseMoved(MouseEvent event) {

int x = event.getX();

int y = event.getY();

if (getRec(x, y) >= 0) {

setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));

} else {

setCursor(Cursor.getDefaultCursor());

}
    }

@Override
    public void mouseDragged(MouseEvent event) {

int x = event.getX();

int y = event.getY();

if (currentSquareIndex >= 0) {

Graphics graphics = getGraphics();

graphics.setXORMode(getBackground());

((Graphics2D) graphics).draw(rect[currentSquareIndex]);

rect[currentSquareIndex].x = x;

rect[currentSquareIndex].y = y;

((Graphics2D) graphics).draw(rect[currentSquareIndex]);

graphics.dispose();

}
    }

public static void main(String[] args) {

JFrame jFrame = new JFrame();

jFrame.setTitle("");

jFrame.setSize(300, 200);

jFrame.addWindowListener(new WindowAdapter() {

@Override

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

Container cPane = jFrame.getContentPane();

cPane.add(new DrawSketch());

jFrame.setVisible(true);
    }
}