Defining generic method inside Non-generic class in Java

Java 8Object Oriented ProgrammingProgramming

You can write a single generic method declaration that can be called with arguments of different types. Based on the types of the arguments passed to the generic method, the compiler handles each method call appropriately. Following are the rules to define Generic Methods −

  • All generic method declarations have a type parameter section delimited by angle brackets (< and >) that precedes the method's return type ( < E > in the next example).

  • Each type parameter section contains one or more type parameters separated by commas. A type parameter, also known as a type variable, is an identifier that specifies a generic type name.

  • The type parameters can be used to declare the return type and act as placeholders for the types of the arguments passed to the generic method, which are known as actual type arguments.

  • A generic method's body is declared like that of any other method. Note that type parameters can represent only reference types, not primitive types (like int, double and char).

Generic methods in non-generic class

Yes, you can define a generic method in a non-generic class in Java.

Example

 Live Demo

public class GenericMethod {
   <T>void sampleMethod(T[] array) {
      for(int i=0; i<array.length; i++) {
         System.out.println(array[i]);
      }
   }
   public static void main(String args[]) {
      GenericMethod obj = new GenericMethod();
      Integer intArray[] = {45, 26, 89, 96};
      obj.sampleMethod(intArray);
      String stringArray[] = {"Krishna", "Raju", "Seema", "Geeta"};
      obj.sampleMethod(stringArray);
   }
}

Output

45
26
89
96
Krishna
Raju
Seema
Geeta
raja
Published on 06-Sep-2019 16:29:31
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