updated classes

User.java

@@ -1,10 +1,10 @@
 public class User {
-    private int id;
+    private  static int id;
     private String name;
     private String password;
 
-    public User(int id, String name, String password) {
-        this.id = id;
+    public User( String name, String password) {
+       id++;
         this.name = name;
         this.password = password;
     }
@@ -21,10 +21,6 @@ public class User {
         return password;
     }
 
-    public void setId(int id) {
-        this.id = id;
-    }
-
     public void setName(String name) {
         this.name = name;
     }