WSL2: Find and Delete Zone.Identifier files

We will see the details about Optional interface in java which introduced from java8.
Dealing with nullpointer exception is big tricky part in java application development. To overcome nullpointer  hurdles we can use Optional interface which holds value or empty.

package java8examples; 

import java.util.Optional;
import java.util.function.Predicate;

public class OptionalExamples {

 
 public static void main(String args[]) {
  
  
  Optional<String> names= Optional.of("Ganguly");
  
  Predicate<String> nameStartsWith= n -> n.toLowerCase().startsWith("g");
  
  
  
  if(names.filter(nameStartsWith).isPresent()) {
   
   
   System.out.println(names.get());
  } else {
   
   
   System.out.print("No Name");
  }
  
  
  
 }
}

References: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Optional.html