Java 12

String methods

Indentation

String message = "Hello World";

System.out.println(message);

System.out.println(message.indent(4));

Hello World
    Hello World

Transforming

System.out.println(message.transform(String::toUpperCase));
System.out.println("my name is %s and I am %d years old".formatted("Alex", 42));

String msg = "Hello \\nWorld";
System.out.println(msg);
System.out.println(msg.translateEscapes());

my name is Alex and I am 42 years old
HELLO WORLD
Hello \nWorld
Hello
World

Path

Comparision

Path path1 = Paths.get("src/main/resources/a.txt");
Path path2 = Paths.get("src/main/resources/b.txt");

System.out.println(Files.mismatch(path1, path1) == -1 ? "Equal": "Not Equal");
System.out.println(Files.mismatch(path1, path2) + " is the first different char");

Equal
6 is the first different char

Number Format

NumberFormat shortN = NumberFormat.getCompactNumberInstance(Locale.US, NumberFormat.Style.SHORT);
NumberFormat longN = NumberFormat.getCompactNumberInstance(Locale.US, NumberFormat.Style.LONG);

System.out.println("      628,969 short -> " + shortN.format(628_969));
System.out.println("      628,969 short -> " + longN.format(628_969));

628,969 short -> 629K
628,969 short -> 629 thousand

Streams

Teeing

List<Stock> result = List.of(s1, s2, s3, s4).stream().collect(
      Collectors.teeing(
        Collectors.maxBy(Comparator.comparing(Stock::value)),
        Collectors.minBy(Comparator.comparing(Stock::value)),
        (e1, e2) -> List.of(e1.get(), e2.get())
      ));

System.out.println(result);

[Stock[name=C, value=125], Stock[name=D, value=1]]