String.formatted()

Call formatted() on the template string itself.

Code Comparison

✕ Java 8

String msg = String.format(
    "Hello %s, you are %d",
    name, age
);

✓ Java 15+

String msg =
    "Hello %s, you are %d"
    .formatted(name, age);

Share 𝕏

See a problem with this code? Let us know.

Why the modern way wins

📖

Reads naturally

Template.formatted(args) flows better than String.format(template, args).

🔗

Chainable

Can be chained with other string methods.

📏

Less verbose

Drops the redundant String.format() static call.

Old Approach

String.format()

Modern Approach

formatted()

Since JDK

Difficulty

Beginner

JDK Support

String.formatted()

Available

Widely available since JDK 15 (Sept 2020)

How it works

String.formatted() is an instance method equivalent to String.format() but called on the format string. It reads more naturally in a left-to-right flow.

String.lines() for line splitting

Java 8

String text = "one\ntwo\nthree";
String[] lines = text.split("\n");
for (String line : lines) {
    System.out.println(line);
}

Java 11+

String text = "one\ntwo\nthree";
text.lines().forEach(IO::println);

Hover to see modern ➜

JDK 11+ →

Strings Beginner

String.strip() vs trim()

Java 8

// trim() only removes ASCII whitespace
// (chars <= U+0020)
String clean = str.trim();

Java 11+

// strip() removes all Unicode whitespace
String clean = str.strip();
String left  = str.stripLeading();
String right = str.stripTrailing();

Hover to see modern ➜

JDK 11+ →

Strings Beginner

String.indent() and transform()

Java 8

String[] lines = text.split("\n");
StringBuilder sb = new StringBuilder();
for (String line : lines) {
    sb.append("    ").append(line)
      .append("\n");
}
String indented = sb.toString();

Java 12+

String indented = text.indent(4);

String result = text
    .transform(String::strip)
    .transform(s -> s.replace(" ", "-"));

Hover to see modern ➜

JDK 12+ →