A FooBar style WTF? using Java8 lambdas

FooFooLambdaWtf.java

import java.util.stream.*;

public class FooFooLambdaWtf {
  public static void main(String[] args) {
    // prints FooBar
    String fooBar = IntStream.range(1, 10).mapToObj(FooFooLambdaWtf::foorBar).collect(Collectors.joining());
    System.out.println(fooBar);

    // prints FooFooFooFooFooFooFooFooFoo
    String fooFooFoo = IntStream.range(1, 10).mapToObj(i -> (i == 3) ? "Foo" : (i == 5) ? "Bar" : "").collect(Collectors.joining());
    System.out.println(fooFooFoo);

    // prints FooBar
    Stream<String> fooBarStream = IntStream.range(1, 10).mapToObj(i -> (i == 3) ? "Foo" : (i == 5) ? "Bar" : "");
    System.out.println(fooBarStream.collect(Collectors.joining()));
  }

  static String foorBar(int i) {
    return (i == 3) ? "Foo" : (i == 5) ? "Bar" : "";
  }
}

Another strange thing :

// prints FooBar
String fooBar = IntStream.range(1, 10).mapToObj((i) -> { String res = (i == 3) ? "Foo" : (i == 5) ? "Bar" : ""; return res; }).collect(Collectors.joining());
System.out.println(fooFooFoo);

// prints FooFooFooFooFooFooFooFooFoo
String fooFooFoo = IntStream.range(1, 10).mapToObj((i) -> { return (i == 3) ? "Foo" : (i == 5) ? "Bar" : ""; }).collect(Collectors.joining());
System.out.println(fooFooFoo);