Added mouse listener to register click on matchfield

src/main/java/de/tims/fleetstorm/gui/GUI.java

@@ -3,6 +3,8 @@ package de.tims.fleetstorm.gui;
 import java.awt.Color;
 import java.awt.Font;
 import java.awt.GridLayout;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
 import java.util.ArrayList;
 
 import javax.swing.JFrame;
@@ -170,6 +172,15 @@ public class GUI extends JPanel {
 				field.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
 				fields.add(field);
 				fieldWrapper.add(field);
+
+				field.addMouseListener(new MouseAdapter() {
+
+					public void mouseClicked(MouseEvent e) {
+						field.setBackground(Color.RED);
+						field.revalidate();
+						field.repaint();
+					}
+				});
 			}
 		}