src/main/java/Action/Action.java

@@ -1,5 +1,5 @@
 package Action;
 
-public abstract class Action {
-    public static Dig Dig = new Dig();
+public interface Action {
+    void exectue(Actor player);
 }

src/main/java/Action/Actor.java

@@ -0,0 +1,8 @@
+package Action;
+
+import Job.Job;
+
+public interface Actor {
+    Job getJob();
+    void performAction(Action action);
+}

src/main/java/Action/Dig.java

@@ -1,5 +1,8 @@
 package Action;
 
-public class Dig extends Action {
-    
+public class Dig implements Action {
+    @Override
+    public void exectue(Actor actor) {
+        actor.performAction(this);
+    }
 }

src/main/java/Character/HasInventory.java

@@ -0,0 +1,7 @@
+package Character;
+
+import java.util.List;
+
+public interface HasInventory {
+    List<String> getInventory();
+}

src/main/java/Job/HasJob.java

@@ -0,0 +1,5 @@
+package Job;
+
+public interface HasJob {
+    Job getJob();
+}

src/main/java/Job/Job.java

@@ -1,21 +1,40 @@
 package Job;
 
-public abstract class Job {
-    private int level;
-    abstract void performJobAction();
+import Action.Actor;
 
-    Job() {
+import java.util.Objects;
+
+public abstract class Job {
+    protected int level;
+    protected String name;
+
+    Job(String name) {
+        this.name = name;
         this.level = 1;
     }
-    Job(int level) {
-        this.level = level;
-    }
 
     public double getLevel() {
         return level;
-    };
+    }
 
     public void levelUp() {
         level++;
     }
+
+    @Override
+    public String toString() {
+        return String.format("Job: %s. Level: %d", name, level);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        return o != null && getClass() == o.getClass();
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
+
 }

src/main/java/Job/Miner.java

@@ -1,30 +1,18 @@
 package Job;
 
-import java.util.Objects;
+import Action.Actor;
+import Character.HasInventory;
 
 public class Miner extends Job {
-    private final String jobName = "Miner";
+      public Miner() {
+          super("Miner");
+      }
 
-    public Miner() {}
 
     @Override
-    public void performJobAction() {
-        System.out.println("Dig...");
-    }
-
-    @Override
-    public String toString() {
-        return "Miner";
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        return o != null && getClass() == o.getClass();
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(jobName);
+    void performJobAction(Actor actor) {
+       if(actor instanceof HasInventory a) {
+            a.getInventory().add("Rock");
+       }
     }
 }

src/main/java/Player.java

@@ -1,11 +1,14 @@
+import Action.Action;
+import Action.Actor;
 import Action.Dig;
 import Job.Job;
+import Job.HasJob;
+import Character.HasInventory;
 
-import java.util.Collection;
 import java.util.LinkedList;
 import java.util.List;
 
-public class Player extends Character implements Movable {
+public class Player extends Character implements Movable, Actor, HasInventory, HasJob {
     protected Job job;
     protected List<String> items = new LinkedList<>();
     public Player(String name, Job job) {
@@ -30,11 +33,13 @@ public class Player extends Character implements Movable {
         return job;
     }
 
-    public void performAction(Dig dig) {
-        items.add("Stone");
-    }
-
     public List<String> getInventory() {
         return items;
     }
+
+    @Override
+    public void performAction(Action action) {
+        action.exectue(this);
+    }
+
 }

src/test/java/MinerTest.java

@@ -1,23 +1,23 @@
-import Action.Action;
 import Job.Miner;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import Action.Dig;
+
 public class MinerTest {
     @Test
     void miner_can_dig() {
         var p = new Player("Steve");
         var job = new Miner();
         p.learnJob(job);
-        p.performAction(Action.Dig);
+        p.performAction(new Dig());
         assertTrue(p.getInventory().contains("Stone"));
     }
 
     @Test
     void miner_can_level_up() {
-        var p = new Player("Steve");
         var job = new Miner();
         assertEquals(1, job.getLevel());
         job.levelUp();