Export of my JShell session from Exploring what's new in Java 10 and 11 (and 12) talk at DevNexus 2019.

devnexus.jsh

List<Integer> list = new ArrayList<Integer>()
list.add(1)
list.add(2)
list.add(3)
list = Collections.unmodifiableList(list)
List<Integer> list2 = new ArrayList<Integer>(list)
List<Integer> list2 = Collections.unmodifiableList(new ArrayList<Integer>(list))
List<Integer> list = List.of(1,2,3)
list.add(4)
List<Integer> list2 = List.copyOf(list)
Set.copyOf(list)
list.stream().collect(toUnmodifiableList())
list.toArray(Integer[]::new)
String s = "  hello\n  "
s.repeat(10)
s.repeat(10)
.lines()
.forEach(System.out::println)
s.stripLeading()
s.stripTrailing()
s.strip()
s.isBlank()
s.repeat(10)
.lines()
.forEach(System.out::println)
s.repeat(10)
.indent(4)
.lines()
.forEach(System.out::println)
s.repeat(10)
.indent(-4)
.lines()
.forEach(System.out::println)
s.transform(s -> 123)
Reader.nullReader()
Writer.nullWriter()
InputStream.nullInputStream()
OutputStream.nullOutputStream()
Path path = Path.of("/tmp/hello")
Files.writeString(path, "hello devnexus")
Files.readString(path)
Files.isSameFile(path, path)
Files.mismatch(path, path)
HttpHandler handler = he -> {
String body = "hello devnexus";
he.sendResponseHeaders(200, body.length());
try (OutputStream os = he.getResponseBody()) {
os.write(body.getBytes());
}
}
/l handler
HttpServer hs = HttpServer.create(new InetSocketAddress(8000), 0)
hs.createContext("/hello", handler)
hs.start()
HttpClient hc = HttpClient.newHttpClient()
hc.version()
HttpRequest request = HttpRequest.newBuilder().uri(URI.create("http://localhost:8000/hello")).GET().build()
HttpResponse<String> response = hc.send(request, BodyHandlers.ofString())
response.statusCode()
response.body()
CompletableFuture<HttpResponse<String>> response = hc.sendAsync(request, BodyHandlers.ofString())
response.get().body()
var x = "hello"
/v x
var list = new ArrayList<String>()
/v list
int x
var x
var x = null
var x = (Integer) null
int x=0, y=0
var x=0, y=0
int inc(int x) { return x+1; }
int inc(var x) { return x+1; }
var inc(int x) { return x+1; }
for (var i=0; i<100; i++) {}
for (var i :list) {}
short x = 1
var x = 1
/v x
var x = 0x12345678
/v x
var x = 0x123456789
var x = 0x123456789l
class MyClass { var x = 1; }
var var = 1
void var() {}
class var {}
class Var {}
enum MyEnum { var }
var[] x = {1,2}
var x = {1,2}
var x = new int[]{1,2}
try { var x = 1; } catch (Exception ex) {}
try { } catch (var ex) {}
Supplier s = () -> ""
var s = () -> ""
Consumer c = (var x) -> System.out.println(x)
BiConsumer c = (var x, var y) -> System.out.println(x)
BiConsumer c = (var x, y) -> System.out.println(x)
BiConsumer c = (var x, Integer y) -> System.out.println(x)
BiConsumer c = (var x, var y) -> System.out.println(x)
/v c
Consumer c = System.out::println
var c = System.out::println
var list = new ArrayList<>()
/v list
var list = new ArrayList<>(Set.of(1))
/v list
var list = new ArrayList()
/v list
List<Integer> list1 = List.of(1)
/v list
/v list1
var x = list1.get(0)
/v x
List<?> list2 = list1
/v list2
var x = list2.get(0)
list2.add(x)
/v x
var x = new Object() { int a = 1; int b = 2; }
x.a
/v x
Object x = new Object() { int a = 1; int b = 2; }
x.a
<T extends Number & Comparable> T makeIntersection() { return null; }
var x = makeIntersection()
/v x
/env
int x = 0
switch (x) { case 0 -> 0; default -> 1; }
var y = switch (x) { case 0 -> 0; default -> 1; }
/v y
var y = switch (x) { case 0 -> 0; default -> "hello"; }
/v y
switch (x) { default -> System.out.println("hello"); }
var y = switch (x) { default -> System.out.println("hello"); }
var y = switch (x) { default -> { System.out.println("hello"); break "hello"; }}