// Get PIDs of own or started processes
out.println("Your pid is " + ProcessHandle.current().pid());
Process p = Runtime.getRuntime().exec("sleep 1h");
ProcessHandle h = ProcessHandle.of(p.pid()) // Optional
.orElseThrow(IllegalStateException::new);
// Do things on exiting process // CompletableFuture
h.onExit().thenRun( ()-> out.println("Sleeper exited") );
// Get info on process
out.printf("[%d] %s - %s\n", h.pid(),
h.info().user().orElse("unknown"),
h.info().commandLine().orElse("none"));
// Kill a process
h.destroy();
````
/* Comment sections would break ... */
List<Integer> listOfNumbers = List.of(1, 2, 3, 4, 5/*, null*/);
Set<Integer> setOfNumbers = Set.of(1, 2, 3, 4, 5/*, 1*/);
Map<String, String> mapOfString =
Map.of("key1", "value1", "key2", "value2");
Map<String, String> moreMapOfString =
Map.ofEntries(
Map.entry("key1", "value1"),
Map.entry("key2", "value2")/*,
Map.entry("key1", "value3")*/
);
````
// return class/method only for our classes.
private static List<String> walkAndFilterStackframe() {
return StackWalker.getInstance().walk(s ->
s.map( frame-> frame.getClassName()+"/"+frame.getMethodName())
.filter(name -> name.startsWith("de.exxcellent"))
.limit(10)
.collect(Collectors.toList()) );
}
````
// All bytes from an InputStream at once
byte[] result = new ByteArrayInputStream(buf)
.readAllBytes();
// Directly redirect an InputStream to an OutputStream
new ByteArrayInputStream(buf)
.transferTo(System.out);
````