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- Java.lang Package classes
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Java Class getTypeParameters() Method
Description
The Java Class getTypeParameters() method returns an array of TypeVariable objects that represent the type variables declared by the generic declaration represented by this GenericDeclaration objece.It returns an array of length 0 if the underlying generic declaration declares no type variables.
Declaration
Following is the declaration for java.lang.Class.getTypeParameters() method
public TypeVariable<Class<T>>[] getTypeParameters()
Parameters
NA
Return Value
This method returns an array of TypeVariable objects that represent the type variables declared by this generic declaration.
Exception
GenericSignatureFormatError − if the generic signature of this generic declaration does not conform to the format specified in the Java Virtual Machine Specification, 3rd edition.
Getting Super Class of a Class Example
The following example shows the usage of java.lang.Class.getTypeParameters() method. In this program, we've retrieved the class of List and then using getTypeParameters() method, the type variable array is prepared. Using first value, we've printed the name of the type variable.
package com.tutorialspoint; public class ClassDemo { public static void main(String[] args) throws Exception { // returns an array of TypeVariable object TypeVariable[] tValue = List.class.getTypeParameters(); System.out.println(tValue[0].getName()); } }
Output
Let us compile and run the above program, this will produce the following result −
E