functional-programming-with-java-method-references-c9103cdf5f8-01.java

List<Customer> customers = ...;

// Lambdas

customers.stream()
         .filter(customer -> customer.isActive())
         .map(customer -> customer.getName())
         .map(name -> name.toUpperCase())
         .peek(name -> System.out.println(name))
         .toArray(count -> new String[count]);

// Method References

customers.stream()
         .filter(Customer::isActive)
         .map(Customer::getName)
         .map(String::toUpperCase) 
         .peek(System.out::println)
         .toArray(String[]::new);