added concept for monsters

src/de/miaurizius/jgame2d/entity/monster/GreenSlimeMON.java

@@ -0,0 +1,51 @@
+package de.miaurizius.jgame2d.entity.monster;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+import de.miaurizius.jgame2d.core.enums.Direction;
+import de.miaurizius.jgame2d.entity.Entity;
+
+import java.util.Random;
+
+public class GreenSlimeMON extends Entity {
+
+    public GreenSlimeMON(GamePanel panel) {
+        super(panel);
+        name = "green-slime";
+        speed = 1;
+        maxLife = 4;
+        life = maxLife;
+
+        solidArea.x = 3;
+        solidArea.y = 18;
+        solidArea.width = 42;
+        solidArea.height = 30;
+        solidAreaDefaultX = solidArea.x;
+        solidAreaDefaultY = solidArea.y;
+
+        getImage();
+    }
+
+    public void getImage() {
+        up1 = initEntitySprites("monster/greenslime_down_1");
+        up2 = initEntitySprites("monster/greenslime_down_2");
+        down1 = initEntitySprites("monster/greenslime_down_1");
+        down2 = initEntitySprites("monster/greenslime_down_2");
+        left1 = initEntitySprites("monster/greenslime_down_1");
+        left2 = initEntitySprites("monster/greenslime_down_2");
+        right1 = initEntitySprites("monster/greenslime_down_1");
+        right2 = initEntitySprites("monster/greenslime_down_2");
+    }
+
+    public void setAction() {
+        actionLock++;
+        if(actionLock != 120) return; //lock action for x frames
+        Random rand = new Random();
+        int i = rand.nextInt(100)+1; //Generate number between 1 and 100
+        if(i <= 25) direction = Direction.UP;
+        if(i > 25 && i <= 50) direction = Direction.DOWN;
+        if(i > 50 && i <= 75) direction = Direction.LEFT;
+        if(i > 75) direction = Direction.RIGHT;
+        actionLock = 0;
+    }
+
+}