Use packages/folders for grouped classes

src/CanFixAccident.java

@@ -1,3 +0,0 @@
-public interface CanFixAccident {
-    //void attendToAccident(Accident accident);
-}

src/ee364/hajj/Gender.java

@@ -1,3 +1,5 @@
+package ee364.hajj;
+
 public enum Gender {
     MALE,
     FEMALE

src/ee364/hajj/Priority.java

@@ -1,3 +1,5 @@
+package ee364.hajj;
+
 public enum Priority {
     HIGH,
     MID,

src/ee364/hajj/group/Campaign.java

@@ -1,3 +1,7 @@
+package ee364.hajj.group;
+
+import ee364.hajj.Priority;
+
 public class Campaign implements PermitedForHaj {
 
     private int UID;

src/ee364/hajj/group/PermitedForHaj.java

@@ -1,3 +1,5 @@
+package ee364.hajj.group;
+
 public interface PermitedForHaj {
     //public boolean has_UID();
     public int hasUID();

src/ee364/hajj/group/Pilgrim.java

@@ -1,3 +1,8 @@
+package ee364.hajj.group;
+
+import ee364.hajj.Gender;
+import ee364.hajj.Priority;
+
 public class Pilgrim {
 
     //keep track of all pilgrim object count.

src/ee364/hajj/transport/Accident.java

@@ -1,3 +1,5 @@
+package ee364.hajj.transport;
+
 import java.util.Date;
 
 public class Accident {
@@ -15,7 +17,7 @@ public class Accident {
         Date startOfSimDate = new Date(15000000);
         //TODO: make a static final class with needed values
         if (date.before(startOfSimDate)){
-            throw new IllegalArgumentException("Date of Accident before t zero");
+            throw new IllegalArgumentException("Date of ee364.hajj.transport.Accident before t zero");
         }
         else this.date = date;
     }

src/ee364/hajj/transport/Breakable.java

@@ -1,3 +1,5 @@
+package ee364.hajj.transport;
+
 import java.util.Date;
 
 public interface Breakable {

src/ee364/hajj/transport/CanFixAccident.java

@@ -0,0 +1,5 @@
+package ee364.hajj.transport;
+
+public interface CanFixAccident {
+    //void attendToAccident(ee364.hajj.transport.Accident accident);
+}

src/ee364/hajj/transport/Sedan.java

@@ -1,3 +1,5 @@
+package ee364.hajj.transport;
+
 import java.util.Date;
 
 public class Sedan extends Vehicle implements Breakable {

src/ee364/hajj/transport/TrafficPoliceCar.java

@@ -1,3 +1,5 @@
+package ee364.hajj.transport;
+
 public class TrafficPoliceCar extends Vehicle implements CanFixAccident {
 
     public final double ADDED_EFFICIENCY = 0.05; // 5%

src/ee364/hajj/transport/Vehicle.java

@@ -1,3 +1,5 @@
+package ee364.hajj.transport;
+
 public abstract class Vehicle {
 
     private double vehicleSize;