// functional/LambdaExpressions.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.

interface Description {
 String brief();
}

interface Body {
 String detailed(String head);
}

interface Multi {
 String twoArg(String head, Double d);
}

public class LambdaExpressions {

 static Body bod = h -> h + " No Parens!"; // [1]

 static Body bod2 = (h) -> h + " More details"; // [2]

 static Description desc = () -> "Short info"; // [3]

 static Multi mult = (h, n) -> h + n; // [4]

 static Description moreLines = () -> { // [5]
 System.out.println("moreLines()");
 return "from moreLines()";
 };

 public static void main(String[] args) {
 System.out.println(bod.detailed("Oh!"));
 System.out.println(bod2.detailed("Hi!"));
 System.out.println(desc.brief());
 System.out.println(mult.twoArg("Pi! ", 3.14159));
 System.out.println(moreLines.brief());
 }
}
/* Output:
Oh! No Parens!
Hi! More details
Short info
Pi! 3.14159
moreLines()
from moreLines()
*/