Java reference

String.toLowerCase()

Returns a copy of the string with all letters in lower case.

Available since: Java 1.0

Syntax

public String toLowerCase()

StringA new string in lower case.

Converting to lower case:

void main() {
    IO.println("Hello, WORLD".toLowerCase());
}

Output:

hello, world

Normalizing input before a comparison:

void main() {
    String command = "  Quit ".strip().toLowerCase();
    IO.println(command.equals("quit"));
}

Output:

true

Like toUpperCase(), the method depends on the system language; for technical strings use toLowerCase(Locale.ROOT).

String methods — The main String methods in Java: searching, substring, changing case, strip, replace, split, join, repeat and string checks.