Implementation of 2D mode

app/src/main/java/chess/view/render2D/Window.java

@@ -0,0 +1,66 @@
+package chess.view.render2D;
+
+import chess.model.Model2D;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.Observable;
+import java.util.Observer;
+
+public class Window extends JFrame implements Observer {
+    private final Model2D model;
+    private final JLabel[][] tab = new JLabel[8][8];
+
+    public Window(Model2D model) {
+        System.out.println("New window has been created.");
+        this.model = model;
+    }
+
+    public static void main(String[] args){
+        new Window(new Model2D()).build();
+    }
+
+    /**
+     * Create a playing grid with alternating black & white grids
+     */
+    private void build(){
+        JPanel jp = new JPanel(new GridLayout(8,8));
+        setContentPane(jp);
+        setTitle("Let's play chess!");
+        for (int y = 0; y < 8; y++){
+            for (int x = 0; x < 8; x++){
+                JLabel jl = new JLabel();
+                jl.setOpaque(true);
+                if (((y+x)%2)!=0) {
+                    jl.setBackground(Color.BLACK);
+                }
+                final int yy = y;
+                final int xx = x;
+
+                jl.addMouseListener(new MouseAdapter() {
+                    public void mouseClicked(MouseEvent e) {
+                        System.out.println("(" + xx + ";" + yy + ")");
+                        model.set(xx, yy);
+                        update();
+                    }
+                });
+                this.tab[x][y]=jl;
+                jp.add(jl);
+            }
+        }
+        setSize(800,800);
+        setVisible(true);
+    }
+
+   public void update() {
+        tab[model.x][model.y].setBackground(Color.RED);
+    }
+
+    @Override
+    public void update(Observable o, Object arg) {
+        System.out.println("ok");
+        update();
+    }
+}