Java 25 (LTS) reference · String Methods

Java String contains() Method

Return true if the string contains a sequence of characters. Case-sensitive.

Java 25 (LTS) Since Java 5

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Syntax

string.contains(sequence)

Parameters

Parameter	Description
`sequence` CharSequence	The text to look for.

Return value

true or false.

Examples

Case-sensitive search

public class Main {
    public static void main(String[] args) {
        String log = "ERROR: disk full";
        System.out.println(log.contains("ERROR"));
        System.out.println(log.contains("error"));
    }
}

Output

true
false

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Case-insensitive search

public class Main {
    public static void main(String[] args) {
        String text = "Learn Java Streams";
        System.out.println(text.toLowerCase().contains("java"));
    }
}