CODEWITHSUNDEEP
javaclassparameters
Miger
Miger

Reputation: 1247

How to pass MyClass.class as a Parameter in my Method?

I'm struggling to use an element as parameter in my code.

For my Hibernate API calls I need to specify which class the query result has to me mapped. Instead of making many small methods which are fairly simmilar I want to DRY it out.

I've got this code here:

private void selectAllFrom(MyClass myclass) {
    CriteriaQuery<MyClass> query = builder.createQuery(Myclass.class);
}

Instead I want to have the MyClass-Class as a generic parameter and use the method like this:

private void selectAllFrom(Class<T> any) {
    CriteriaQuery<Class<T>> query = builder.createQuery(Class<T>.class)
}

// usage: 
// selectAllFrom(MyClass.class)

How can this be done in Java?

Upvotes: 1

Views: 217

Answers (1)

Ayrton
Ayrton

Reputation: 2313

This should work. Note that you must use T when referencing a type, and any when referencing the Class<?> value required by createQuery and other methods.

private <T> void selectAllFrom(Class<T> any) {
    CriteriaQuery<T> query = builder.createQuery(any)
}

Upvotes: 4

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