Class getTypeParameters() method in Java with Examples

The getTypeParameters() method of java.lang.Class class is used to get the type parameters of this entity. This entity can be a class, an array, an interface, etc. The method returns an array of TypeVariable objects representing the type variables.

Syntax:

public TypeVariable<Class<T>> getTypeParameters()

Parameter: This method does not accept any paramter.

Return Value: This method returns an array of TypeVariable objects representing the type variables.

Below programs demonstrate the getTypeParameters() method.



Example 1:

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// Java program to demonstrate getTypeParameters() method
  
import java.util.*;
  
public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {
  
        // returns the Class object for this class
        Class myClass = Class.forName("Test");
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString());
  
        // Get the type parameters of myClass
        // using getTypeParameters() method
        System.out.println(
            "TypeParameters of myClass: "
            + Arrays.toString(
                  myClass.getTypeParameters()));
    }
}

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Output:

Class represented by myClass: class Test
TypeParameters of myClass: []

Example 2:

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// Java program to demonstrate getTypeParameters() method
  
import java.util.*;
  
public class Test {
  
    public static void main(String[] args)
        throws ClassNotFoundException
    {
        // returns the Class object for this class
        Class myClass = Class.forName("java.lang.Integer");
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString());
  
        // Get the type parameters of myClass
        // using getTypeParameters() method
        System.out.println(
            "TypeParameters of myClass: "
            + Arrays.toString(
                  myClass.getTypeParameters()));
    }
}

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Output:

Class represented by myClass: class java.lang.Integer
TypeParameters of myClass: []

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getTypeParameters–

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