Java 8 Lambda example

gistfile1.txt

In this simple example, we are taking a List<String> of names, sorting them, creating Person objects and printing the result. The first way uses single line lambda expressions:

names.stream().sorted((o1, o2) -> o1.compareTo(o2)).
  map(name -> new Person(name)).
  forEach(p -> System.out.println(p.getName()));

The second one wraps each expression in a bracket and makes the types explicit:

names.stream().sorted(( String o1, String o2 ) -> 
 {
   return o1.compareTo(o2);
 }
).map((String name) -> 
 {
   return new Person(name);
 }
).forEach((Person p) -> 
 {
   System.out.println(p.getName());
 }
);

The following results in a syntax error:

names.stream().map(name -> new Person(name); "foo")