Paint

package Main;

public class Main {

    public static void main(String[] args) {
        new MainFrame();

    }

}
/////////////////////////////////////////
package Main;

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;

import draw.DrawPanel;
import Menu.MainMenu;
import Menu.MainToolbar;

public class MainFrame extends JFrame {

    private static final long serialVersionUID = 1L;
    private static final Dimension SIZE = new Dimension(800, 600);
    private DrawPanel panel = new DrawPanel();
    public MainFrame(){
        super("Java Paint");
        setLayout(new BorderLayout());
        add(panel, BorderLayout.CENTER);
        //
        MainMenu oknog = new MainMenu();
        setJMenuBar(oknog);
        MainToolbar oknot = new MainToolbar();
        add(oknot, BorderLayout.NORTH);

        setSize(SIZE);
        setResizable(true);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);

    }

}
//////////////////////////////////////////
package draw;

import java.awt.Color;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JPanel;

import draw.shapes.Shape;
import listeners.DrawPanelListener;

public class DrawPanel extends JPanel {

    private static final long serialVersionUID = 1L;
    private DrawPanelListener dpl;
    private List<Shape>shapes = new ArrayList<>();
    private Shape tmpShape;

    public DrawPanel()
    {
        setOpaque(true);
        setBackground(Color.WHITE);
        dpl = new DrawPanelListener(this);
        addMouseListener(dpl);

        addMouseMotionListener(dpl);



    }
    public  void paintComponents(Graphics g){
        super.paintComponent(g);
        if(tmpShape != null)
            tmpShape.render(g);
        for(Shape s : shapes )
        {
            if(s != null)
                s.render(g);

        }
    }
    public List<Shape> getShapes() {
        return shapes;
    }
    public void setShapes(List<Shape> shapes) {
        this.shapes = shapes;
    }
    public Shape getTmpShape() {
        return tmpShape;
    }
    public void setTmpShape(Shape tmpShape) {
        this.tmpShape = tmpShape;
    }

}
/////////////////////////////////////////////////
package Menu;

import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


public class MainMenu extends JMenuBar{

private JMenuItem newAction = new JMenuItem("Nowy");
private JMenuItem openAction = new JMenuItem("Otwórz");
private JMenuItem saveAction = new JMenuItem("Zapisz");
private JMenuItem saveAsAction = new JMenuItem("Zapisz jako");
private JMenuItem printAction = new JMenuItem("Drukuj");
private JMenuItem exit = new JMenuItem("Zamknij");


private JMenuItem undoAction = new JMenuItem("Cofnij");
private JMenuItem redoAction = new JMenuItem("Redo");
private JMenuItem copyAction = new JMenuItem("Kopiuj");
private JMenuItem cutAction = new JMenuItem("Wytnij");
private JMenuItem pasteAction = new JMenuItem("Wklej");

    private static final long serialVersionUID = 1L;
    public MainMenu(){
    JMenu plikmenu = new JMenu("Plik");
    JMenu edycjamenu = new JMenu("Edycja");

    this.add(plikmenu);
    this.add(edycjamenu);




    plikmenu.add(newAction);
    plikmenu.add(openAction);
    plikmenu.add(saveAction);
    plikmenu.add(saveAsAction);
    plikmenu.addSeparator();
    plikmenu.add(printAction);
    plikmenu.addSeparator();
    plikmenu.add(exit);


    edycjamenu.add(undoAction);
    edycjamenu.add(redoAction);
    edycjamenu.addSeparator();
    edycjamenu.add(copyAction);
    edycjamenu.add(cutAction);
    edycjamenu.add(pasteAction);


    initFileActions();
    initEditionAction();

}
private void initEditionAction() {
undoAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
redoAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
copyAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
cutAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
pasteAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});


}
private void initFileActions(){
newAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
openAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
saveAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
saveAsAction.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {

    // TODO Auto-generated method stub

}
});
printAction.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        // TODO Auto-generated method stub

    }
});
exit.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {

        System.exit(0);
    }
});

}
}
///////////////////////////////
package listeners;

import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.List;

import draw.DrawPanel;
import draw.shapes.Shape;
import draw.shapes.Square;

public class DrawPanelListener implements MouseListener , MouseMotionListener {
    private DrawPanel panel;
    private boolean draw = false;
    private Shape drawShape;
    public DrawPanelListener(DrawPanel dp){
        panel = dp;

    }


    @Override
    public void mouseClicked(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

        if(!draw)
            draw= true;

        drawShape = new Square(e.getX(),e.getY(), e.getX() + 1, e.getY() + 1, Color.black);
        panel.setTmpShape(drawShape);
        panel.repaint();
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        drawShape.setX2(e.getX());
        drawShape.setY2(e.getY());

        List<Shape>shapes = panel.getShapes();
        shapes.add(drawShape);
        panel.setTmpShape(null);
        panel.setShapes(shapes);
        drawShape  = null;
        panel.repaint();

    }


    @Override
    public void mouseDragged(MouseEvent e) {
        // TODO Auto-generated method stub
        drawShape.setX2(e.getX());
        drawShape.setY2(e.getY());
        panel.setTmpShape(drawShape);
        panel.repaint();
    }


    @Override
    public void mouseMoved(MouseEvent e) {
        // TODO Auto-generated method stub

    }

}
////////////////////////////////
package draw.shapes;

import java.awt.Color;
import java.awt.Graphics;

public abstract class Shape {
    private int x,y;
    private int y2,x2;
    private Color color;
    public Shape (int x, int y, int x2, int y2, Color c)
    {
        this.x =x;
        this.y=y;
        this.y2 = y2;
        this.x2 = x2;
        color = c;
    }
    public abstract void render(Graphics g);
    public int Wight() {
        if(x2>x)
            return x2-x;
        else
            return x-x2;
    }
    public int Height()
    {
        if(y2>y)
            return y2-y;
        else
            return y-y2;

    }
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    public int getY2() {
        return y2;
    }
    public void setY2(int y2) {
        this.y2 = y2;
    }
    public int getX2() {
        return x2;
    }
    public void setX2(int x2) {
        this.x2 = x2;
    }
    public Color getColor() {
        return color;
    }
    public void setColor(Color color) {
        this.color = color;
    }

}
package draw.shapes;

import java.awt.Color;
import java.awt.Graphics;

public class Square extends Shape {

    public Square(int x, int y, int x2, int y2, Color c) {
        super(x, y, x2, y2, c);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void render(Graphics g) {
        g.setColor(getColor());
        g.fillRect(getX(), getY(), Wight(), Height());
        // TODO Auto-generated method stub

    }

}
//////////////////////////////////////
package Menu;

import javax.swing.JToolBar;

public class MainToolbar extends JToolBar{

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    public MainToolbar() {
        // TODO Auto-generated constructor stub
    }

}