added monster damage

src/de/miaurizius/jgame2d/entity/Entity.java

@@ -4,6 +4,7 @@ import de.miaurizius.jgame2d.core.Boot;
 import de.miaurizius.jgame2d.core.enums.Direction;
 import de.miaurizius.jgame2d.core.GamePanel;
 import de.miaurizius.jgame2d.core.Utility;
+import de.miaurizius.jgame2d.core.enums.EntityType;
 
 import javax.imageio.ImageIO;
 import java.awt.*;
@@ -25,11 +26,14 @@ public class Entity {
     public int solidAreaDefaultX,  solidAreaDefaultY;
     public boolean collisionOn = false;
     public int actionLock = 0;
+    public boolean invincible = false;
+    public int invincibleCount = 0;
     String[] dialogue = new String[20];
     int dialogueIndex = 0;
     public BufferedImage image, image2, image3;
     public String name;
     public boolean collision = false;
+    public EntityType type;
 
     // CHARACTER STATUS
     public int maxLife;
@@ -61,7 +65,13 @@ public class Entity {
         panel.collisionH.checkObject(this, false);
         panel.collisionH.checkEntity(this, panel.npc);
         panel.collisionH.checkEntity(this, panel.monster);
-        panel.collisionH.checkPlayer(this);
+        boolean contactPlayer = panel.collisionH.checkPlayer(this);
+
+        if(this.type == EntityType.MONSTER && contactPlayer) {
+            if(panel.player.invincible) return;
+            panel.player.life -= 1;
+            panel.player.invincible = true;
+        }
 
         if(!collisionOn) {
             switch (direction) {
@@ -81,7 +91,7 @@ public class Entity {
         }
     }
 
-    public void draw(Graphics graphics2d) {
+    public void draw(Graphics2D graphics2d) {
         int screenX = worldX - panel.player.worldX + panel.player.screenX;
         int screenY = worldY - panel.player.worldY + panel.player.screenY;