How to use JDK 13’s String::formatted method

JDK 13 introduces multiline strings to the Java programming language. This feature comes with util methods to go along with it. One of them is String::formatted .

Let’s test it out.

Before JDK 13, it was only possible to format a String with an invocation not done on the String itself :

new Formatter().format("%s, %s !", "Hello", "World")

String.format("%s, %s !", "Hello", "World")

It is now possible to use the template String directly as the source of the invocation

"%s, %s !".format("Hello", "World") will print Hello World ! as expected.

Tested in jshell with OpenJDK 13, it still gives a warning because of its @deprecated javadoc annotation

|  Warning:
|  formatted(java.lang.Object...) in java.lang.String has been deprecated and marked for removal
|  "%s, %s !".formatted("Hello", "World")
|  ^------------------^
$12 ==> "Hello, World !"

But this is not a problem and will disappear once the JDK is officially released.