implement Goblin and Skeleton and Vampire

Java-Knight/src/main/java/org/project/entity/enemies/Goblin.java

@@ -1,4 +1,33 @@
 package org.project.entity.enemies;
 
-public class Goblin {
+import org.project.entity.players.Player;
+
+public class Goblin extends Enemy {
+
+    private final static EnemyStats stats = new EnemyStats(60, 12, 20);
+    private final double critChance;
+    private final double critMultiplier;
+
+    public Goblin() {
+        super(stats);
+        critChance = 0.25;
+        critMultiplier = 1.8;
+    }
+
+    @Override
+    public void attack(Player target) {
+
+        if(Math.random()<critChance && !isStunned()) {
+            target.takeDamage((int) (stats.damage * critMultiplier));
+            System.out.println("The goblin landed a critical hit!");
+        }
+        else
+            super.attack(target);
+
+    }
+
+    @Override
+    public String getType() {
+        return "Goblin";
+    }
 }

Java-Knight/src/main/java/org/project/entity/enemies/Skeleton.java

@@ -1,6 +1,30 @@
 package org.project.entity.enemies;
 
-// TODO: UPDATE IMPLEMENTATION
-public class Skeleton {
-    // TODO: DESIGN ENEMY AND IMPLEMENT THE CONSTRUCTOR
+
+public class Skeleton extends Enemy{
+
+    private final static EnemyStats stats = new EnemyStats(110, 16, 35);
+    private boolean reviveEnabled;
+
+    public Skeleton() {
+        super(stats);
+        reviveEnabled = true;
+    }
+
+
+    public void revive() {
+        if(!isAlive() && reviveEnabled) {
+            heal(getMaxHP() / 2);
+            reviveEnabled = false;
+            System.out.println("the skeleton comes back to life!");
+        }
+    }
+
+    @Override
+    public String getType() {
+        return "Skeleton";
+    }
+
+    public boolean getReviveEnabled() { return reviveEnabled;}
+
 }

Java-Knight/src/main/java/org/project/entity/enemies/Vampire.java

@@ -1,4 +1,25 @@
 package org.project.entity.enemies;
 
-public class Vampire {
+import org.project.entity.players.Player;
+
+public class Vampire extends Enemy{
+
+    private final static EnemyStats stats = new EnemyStats(95, 18, 45);
+    private final int damageDivisor;
+
+    public Vampire() {
+        super(stats);
+        damageDivisor = 5;
+    }
+
+    @Override
+    public void attack(Player target) {
+        super.attack(target);
+        heal(stats.damage/damageDivisor); //a percentage of the damage is added to HP
+    }
+
+    @Override
+    public String getType() {
+        return "Vampire";
+    }
 }