While instantiating generic types in Java may appear straightforward, the underlying mechanisms can be surprisingly nuanced. This article elaborates on the technique to instantiate an object of a generic type, delving into the intricacies of Java's generic system.
Given a generic class declaration like:
public class Abc<T> {
public T getInstanceOfT() {
// Instantiate an instance of T and return it.
}
}To instantiate an object of type T, the type information needs to be provided explicitly at runtime. This is achieved using the Class object:
public class Abc<T> {
public T getInstanceOfT(Class<T> aClass) {
return aClass.newInstance();
}
}When calling this method, the actual type parameter must be specified:
Abc<String> abc = new Abc<>(); String instance = abc.getInstanceOfT(String.class);
Note that exception handling is required to manage potential instantiation failures.
This approach allows flexibility in runtime instantiation, as the generic type can vary dynamically based on the calling code.
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