We can specify two collectors (called downstream collectors) and a merger function that combines the results of the two collectors: Stream numbers = new Random().ints( 100).boxed() We can do it easier using the 'Teeing Collector' introduced in Java 12. This approach is quite complex and not very legible.

Long range = ( long) result - result Code language: Java ( java ) The method reference is interpreted as a function, and the String is passed to its apply() method: public R transform (Function f), When you look at the source code of ansform(), you will notice that there is no rocket science at work. Here are a few examples: String uppercase = 'abcde'.transform(String::toUpperCase) The new ansform() method applies an arbitrary function to a String and returns the function's return value. Code language: MIPS Assembly ( mipsasm ) ansform() (s.indent( 4)) Code language: Java ( java ) The following example shows how to indent a multiline string by four spaces: String s = 'I am a multiline String.' Java 12 has such a method built-in: String.indent().

If it should work over multiple lines, the method became correspondingly complex. To indent a string, we used to write a small helper method that put the desired number of spaces in front of the String. After we got a few new String methods in Java 11 and the Files.readString() and writeString() methods, the JDK developers extended both classes again for Java 12.

Java jdk 12