src/main/java/Job/Job.java

@@ -1,26 +1,5 @@
 package Job;
 
-public class Job {
-    protected String name;
-    public Job(String name) {
-        this.name = name;
-    }
-
- public static Job Miner() {
-        return new Job("Miner");
-    }
-
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
-        Job job = (Job) o;
-        return name.equals(job.name);
-    }
-
-    @Override
-    public int hashCode() {
-        return name.hashCode();
-    }
+public interface Job {
+    void performJobAction();
 }

src/main/java/Job/Miner.java

@@ -0,0 +1,30 @@
+package Job;
+
+import java.util.Objects;
+
+public class Miner implements Job {
+    private final String jobName = "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);
+    }
+}

src/test/java/PlayerTest.java

@@ -1,4 +1,4 @@
-import Job.Job;
+import Job.Miner;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -26,10 +26,11 @@ class PlayerTest {
     @Test
     public void can_change_job() {
         var p = defaultPlayer();
-        var job = Job.Miner();
         assertNull(p.getJob());
+
+        var job = new Miner();
         p.learnJob(job);
-        assertEquals(Job.Miner(), p.getJob());
+        assertEquals(new Miner(), p.getJob());
     }