movement - Making Minecraft in 2D. Blocks move when player moves

I want to make a 2D Minecraft game and I have drawn the grass blocks and you can dig but when the palyer moves the dirt moves too. It draws on every block wich the player touches a dirt block because I said that it has to draw it on r.getX() and r.getY() and it changes every time the player moves. Could someone please help me?

This is my code.

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.ArrayList;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JPanel;

public class Gameplay extends JPanel implements ActionListener, KeyListener, MouseListener{

public BufferedImage player;
public BufferedImage grass;
public BufferedImage dirt;
private BufferedImage dbImage;
private Graphics dbg;
private int x = 0;
private int y = 0;
private double velX = 8.0f;
private double velY = 8.0f;
public Rectangle rectangle;

public Rectangle rectangle2;
public Rectangle MouseRect;
public boolean BlockD = false;
public ArrayList blockList = new ArrayList();
private int[] xb = {0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650};
private int[] yb = {0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650};
//
public Gameplay(){
    addMouseListener(this);
    addKeyListener(this);

    setFocusable(true);
    try {
        player = ImageIO.read(getClass().getResource("Player.png"));
        grass = ImageIO.read(getClass().getResource("Grass.png"));
        dirt = ImageIO.read(getClass().getResource("Dirt.png"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}


public void paint(Graphics g){
    dbImage = (BufferedImage) createImage(getWidth(), getHeight());
    dbg = dbImage.getGraphics();
    paintComponent(dbg);
    g.drawImage(dbImage, 0, 0, this);
    repaint();
}

public void paintComponent(Graphics g){

    drawBlock(g);
    rectangle2 = new Rectangle(x, y, 35, 35);
    g.drawString("Jake", x, y);
    for(Rectangle r : blockList) {
        g.drawImage(dirt, (int) r.getX(), (int) r.getY(), this);
    }
    // Draw player after dirt blocks
    g.drawImage(player, x, y, this);
}


public void drawBlock(Graphics g){
    for(int first = 0; first < 10; first++){
        for(int second = 0; second < 10; second++){
            g.drawImage(grass, xb[first], yb[second], this);
        }
    }
}

@Override
public void actionPerformed(ActionEvent e) {

    // TODO Auto-generated method stub

}

@Override
public void keyPressed(KeyEvent e) {
    if(e.getKeyCode() == KeyEvent.VK_UP){
        y += -velY;
    }
    else if(e.getKeyCode() == KeyEvent.VK_DOWN){

        y += velY;
    }
    else if(e.getKeyCode() == KeyEvent.VK_LEFT){
        x += -velX;
    }
    else if(e.getKeyCode() == KeyEvent.VK_RIGHT){
        x += velX;
    }
    else if(e.getKeyCode() == KeyEvent.VK_SPACE){
        int blockX = Math.round(x / 50) * 50;

        int blockY = Math.round(y / 50) * 50;
        blockList.add(new Rectangle(x, y)); 
    }   
}

@Override
public void keyReleased(KeyEvent e) {
    // TODO Auto-generated method stub

}


@Override
public void keyTyped(KeyEvent e) {
    // TODO Auto-generated method stub

}

@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(e.getButton() == MouseEvent.BUTTON1){


    }
}

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

}
}

Thanks.

Answer

This is exactly what you'd expect to happen. This is the code that draws your dirt blocks:

for(Rectangle r : blockList) {
    if(rectangle2.intersects(r)) {
        if(BlockD){
            g.drawImage(dirt, (int) r.getX(), (int) r.getY(), this);
        }
    }
}

This code says, for every rectangle (grass block) on the map, draw a dirt block if the player is standing on that rectangle. So of course your dirt blocks move when the player moves - that's what you're telling it to do.

I'm guessing what you want to do is create a dirt block on the current block when you press space. This should be a quite simple fix:

public Gameplay() {
    addMouseListener(this);
    addKeyListener(this);
    setFocusable(true);
    try {
        player = ImageIO.read(getClass().getResource("Player.png"));
        grass = ImageIO.read(getClass().getResource("Grass.png"));

        dirt = ImageIO.read(getClass().getResource("Dirt.png"));
    } catch (IOException e) {
        e.printStackTrace();
    }

    // Remove this code!
    /* for(int first = 0; first < 10; first++){
        for(int second = 0; second < 10; second++){
            rectangle = new Rectangle(xb[first], yb[second], 50, 50);
            blockList.add(rectangle);

        }
    } */
}

public void keyPressed(KeyEvent e) {
    if (...) {
        // Movement code for player
    }
    else if(e.getKeyCode() == KeyEvent.VK_SPACE){
        // Place dirt block at current coordinates

        // Round the coordinates to closest block
        int blockX = Math.round(x / 50) * 50;
        int blockY = Math.round(y / 50) * 50;
        blockList.add(new Ractangle(blockX, blockY, 50, 50));
    }   
}

public void paintComponent(Graphics g){
    drawBlock(g);
    g.drawString("Jake", x, y);


    // Draw all dirt blocks
    for(Rectangle r : blockList) {
        g.drawImage(dirt, (int) r.getX(), (int) r.getY(), this);
    }
    // Draw player after dirt blocks
    g.drawImage(player, x, y, this);
}

Note that I have changed what blockList is used for. Before it was the rectangles for all grass blocks but now it is the rectangles for the dirt blocks.