49 lines
1.1 KiB
Java
49 lines
1.1 KiB
Java
// functional/LambdaExpressions.java
|
|
// (c)2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://mindviewinc.com/Books/OnJava/ 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()
|
|
*/
|