OnJava8-Examples/functional/LambdaExpressions.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// functional/LambdaExpressions.java

// 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()