OnetoOne
UserDetails.java

@Entity
@Getter
@Setter
@Table(name="USER_DETAIL")
public class UserDetails 
{	
	@Id @GeneratedValue(strategy = GenerationType.AUTO)	
	private int UserId;	
	private String UserName;
	  
	@OneToOne
	private Vehicles veh;
}

Vehicles.java

@Entity
@Getter
@Setter
public class Vehicles 
{
	@Id @GeneratedValue
	private int vehicleId;
	
private String vehicleName;
}

CreateTable.java

public static void main(String[] args) 
  {
		UserDetails objUserDetail1 =  new UserDetails();
		objUserDetail1.setUserName("Mugil Vannan");
		
		Vehicles objVeh = new Vehicles();
		objVeh.setVehicleName("Suzuki");
		objUserDetail1.setVeh(objVeh);
		
		UserDetails objUserDetail2 =  new UserDetails();
		objUserDetail2.setUserName("Mani");
		
		Vehicles objVeh2 = new Vehicles();
		objVeh2.setVehicleName("Maruthi");
		objUserDetail2.setVeh(objVeh2);
		
		SessionFactory sessionFact = createSessionFactory();
		Session session = sessionFact.openSession();
		
		session.beginTransaction();				
		session.save(objUserDetail1);
		session.save(objVeh);
		session.save(objUserDetail2);
		session.save(objVeh2);
		session.getTransaction().commit();
		session.close();
  }

OnetoMany
UserDetails.java

@Getter
@Setter
@Entity
@Table(name="USER_DETAIL")
public class UserDetails 
{	
	@Id @GeneratedValue(strategy = GenerationType.AUTO)	
	private int UserId;	
	
        private String UserName;
	  
	@OneToMany	
        @JoinTable(joinColumns=@JoinColumn(name="USER_ID"),
	           inverseJoinColumns=@JoinColumn(name="VEHICLE_ID"))
	private List<Vehicles> arrVeh = new ArrayList<Vehicles>();
}

Vehicles.java

@Getter
@Setter
@Entity
public class Vehicles 
{
	@Id @GeneratedValue
	private int vehicleId;
	
        private String vehicleName;
}

CreateTables.java

 public static void main(String[] args) 
  {
        UserDetails objUserDetail1 =  new UserDetails();
        objUserDetail1.setUserName("Mugil Vannan");

        Vehicles objVeh = new Vehicles();
        objVeh.setVehicleName("Suzuki");
        objUserDetail1.getArrVeh().add(objVeh);

        Vehicles objVeh2 = new Vehicles();
        objVeh2.setVehicleName("Maruthi");
        objUserDetail1.getArrVeh().add(objVeh2);

        SessionFactory sessionFact = createSessionFactory();
        Session session = sessionFact.openSession();

        session.beginTransaction();				
        session.save(objUserDetail1);
        session.save(objVeh);
        session.save(objVeh2);
        session.getTransaction().commit();
        session.close();	
  }

ManytoOne
UserDetails.java

@Getter
@Setter
@Entity
@Table(name="USER_DETAIL")
public class UserDetails {	
	@Id @GeneratedValue(strategy = GenerationType.AUTO)	
	private int UserId;	
	
        private String UserName;
}

Vehicles.java

@Getter
@Setter
@Entity
public class Vehicles {
	@Id @GeneratedValue
	private int vehicleId;
	
        private String vehicleName;
	
	@ManyToOne	
	private UserDetails objUserDetails;
}

CreateTables.java

public static void main(String[] args) 
  {	
	Vehicles objVeh1 = new Vehicles();
        objVeh1.setVehicleName("Suzuki");

	Vehicles objVeh2 = new Vehicles();
	objVeh2.setVehicleName("Maruthi");

	UserDetails objUserDetail1 =  new UserDetails();
	objUserDetail1.setUserName("Mugil Vannan");
	
	objVeh1.setObjUserDetails(objUserDetail1);
	objVeh2.setObjUserDetails(objUserDetail1);
			
	SessionFactory sessionFact = createSessionFactory();
	Session session = sessionFact.openSession();

	session.beginTransaction();				
	session.save(objUserDetail1);		
	session.save(objVeh1);
	session.save(objVeh2);
	session.getTransaction().commit();
	session.close();	
  }

ManytoMany
UserDetails.java

@Getter
@Setter
@Entity
@Table(name="USER_DETAIL")
public class UserDetails {	
	@Id @GeneratedValue(strategy = GenerationType.AUTO)	
	private int UserId;	
	
        private String UserName;
	
	@ManyToMany
	private List<Vehicles> arrVehicles = new ArrayList<Vehicles>();
}

Vehicles.java

@Getter
@Setter
@Entity
public class Vehicles {
	@Id @GeneratedValue
	private int vehicleId;
	
        private String vehicleName;
	
	@ManyToMany(mappedBy="arrVehicles") 
	private List<UserDetails> arrUserDetails = new ArrayList<UserDetails>();
}

CreateTables.java

public static void main(String[] args) 
  {	
	Vehicles objVeh1 = new Vehicles();
	objVeh1.setVehicleName("Suzuki");
	
	Vehicles objVeh2 = new Vehicles();
	objVeh2.setVehicleName("Maruthi");
	
	UserDetails objUserDetail1 =  new UserDetails();
	objUserDetail1.setUserName("Mugil Vannan");
	
	UserDetails objUserDetail2 =  new UserDetails();
	objUserDetail2.setUserName("Mani");
	
	objVeh1.getArrUserDetails().add(objUserDetail1);
	objVeh1.getArrUserDetails().add(objUserDetail2);
	
	objUserDetail1.getArrVehicles().add(objVeh1);
	objUserDetail1.getArrVehicles().add(objVeh2);
							
	SessionFactory sessionFact = createSessionFactory();
	Session session = sessionFact.openSession();
	
	session.beginTransaction();				
	session.save(objUserDetail1);
	session.save(objUserDetail2);		
	session.save(objVeh1);
	session.save(objVeh2);
	session.getTransaction().commit();
	session.close();	
  }