Java 25 (LTS) reference · String Methods

Java String toUpperCase() Method

Return a copy of the string in upper case. toLowerCase() does the opposite.

Java 25 (LTS) Since Java 1.0

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Syntax

string.toUpperCase()

Return value

A new String.

Examples

Change case

public class Main {
    public static void main(String[] args) {
        String s = "Hello Java";
        System.out.println(s.toUpperCase());
        System.out.println(s.toLowerCase());
        System.out.println(s);  // unchanged: strings are immutable
    }
}

Output

HELLO JAVA
hello java
Hello Java

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Normalise user input

public class Main {
    public static void main(String[] args) {
        String input = "YES";
        boolean agreed = input.toLowerCase().equals("yes");
        System.out.println(agreed);
    }
}