java generics how objects are creating in generics

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public <<requestType>>Details createRequest()
{
<<requestType>>Details request = new <<requestType>>Impl();
// populate request attributes
return request;
}

what does it mean in java

Posted 24-Oct-13 20:36pm

Member 10359119

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Prasad Khandekar · Answer 1 · 2013-10-24T20:45:00

Solution 1

Hello,

The code you have presented has no meaning. To learn more about Generics please have a look at this [^] documentation.

You can write a single generic method declaration that can be called with arguments of different types. Based on the types of the arguments passed to the generic method, the compiler handles each method call appropriately. Following are the rules to define Generic Methods:

All generic method declarations have a type parameter section delimited by angle brackets (< and >) that precedes the method's return type ( < E > in the next example).
Each type parameter section contains one or more type parameters separated by commas. A type parameter, also known as a type variable, is an identifier that specifies a generic type name.
The type parameters can be used to declare the return type and act as placeholders for the types of the arguments passed to the generic method, which are known as actual type arguments.
A generic method's body is declared like that of any other method. Note that type parameters can represent only reference types, not primitive types (like int, double and char).

Example:

Java

 // generic method printArray                         
public static < E > void printArray( E[] inputArray )
{
    // Display array elements              
    for ( E element : inputArray ){        
        System.out.printf( "%s ", element );
    }
    System.out.println();
}

Regards,

Posted 24-Oct-13 20:45pm

Prasad Khandekar

Comments

Member 10359119 25-Oct-13 2:47am

public PatientVerificationRequestDetails createPatientVerificationRequestOpvDetails() {
PatientVerificationRequestDetails request = new PatientVerificationRequestDetailsImpl();
Calendar todaysDate =
new GregorianCalendar(TimeZone.getTimeZone("default"));
Calendar earliestDate = new GregorianCalendar(TimeZone.getTimeZone("default"));
earliestDate.set(2009,7,1);
request.setEarliestDateOfService(earliestDate);
request.setOPVTypeCde("OPV");
// add patient details to voucher 1
MedicarePersonDetails patient = new MedicarePersonDetailsImpl();
patient.setGender("M");
Calendar dob = new GregorianCalendar(TimeZone.getTimeZone("default"));
dob.set(1958,01,31);
patient.setDateOfBirth(dob);
IdentityDetails identity = new IdentityDetailsImpl();
identity.setFirstName("Bailey");
identity.setLastName("O'Work");
patient.setIdentity(identity);
IdentityDetails alias = new IdentityDetailsImpl();
alias.setFirstName("Alias1");
alias.setLastName("Alias2");
patient.setAlias(alias);
MembershipDetails member = new MembershipDetailsImpl();
member.setMemberRefNum("1");
member.setMemberNum("0123456789");
patient.setMedicare(member);
MembershipDetails membership = new MembershipDetailsImpl();
membership.setMemberRefNum("5");
membership.setMemberNum("123456789012345");
membership.setOrganisation("CCA");
patient.setHealthFund(membership);
request.setPatient(patient);
ProviderDetails provider = new ProviderDetailsImpl();
provider.setProviderNum("4444444J");
request.setProvider(provider);
return request;
}

what is new PatientVerificationRequestDetailsImpl();
new MembershipDetailsImpl();
any suggestion

Prasad Khandekar 25-Oct-13 2:59am

PatientVerificationRequestDetails, MembershipDetails are the interfaces and PatientVerificationRequestDetailsImpl, MembershipDetailsImpl are the implementations of those interfaces (Concrete Classes).

Regards,

Member 10359119 25-Oct-13 3:22am

can you give me one example of MembershipDetailsImpl implementations of that interfaces
really appreciable

Prasad Khandekar 25-Oct-13 3:47am

Just create a new class as shown below

public class MyMembershipDetails implements MembershipDetails {
....
}

If you are using Eclipse for the development. Then In the Package Explorer right click on any package where you want to put the implementation and choose New->Class. In the resulting window Type in your desired class name in the Name textbox. Click On Add button next to Interfaces combo and type MembershipDetails in the Choose Interfaces textbox. The matched interface should appear in the Matiching Items. just docuble click to select it. Now in the New Java Class dialog tick the checkbox named Inherited abstract method and hit ok to generate the class. You will get a class with all the methods to be implemented.

Member 10359119 25-Oct-13 4:36am

Thanks sir

Prasad Khandekar 25-Oct-13 9:32am

Please mark the answer as accepted to close the question.

Member 10359119 25-Oct-13 3:12am

so how can i create using above example

public <PatientVerificationRequestDetails>Details createRequest()
{
<PatientVerificationRequestDetails>Details request = new <PatientVerificationRequestDetails>Impl();
// populate request attributes
return request;
}

my doubt is what is new <PatientVerificationRequestDetails>Impl();