如何在 Java 中實例化泛型類型：運行時類型特異性指南

Instantiating Generic Types in Java: Unveiling a Seemingly Trivial Conundrum

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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