How to Check if a List Contains an Uppercase String in Java8

Learn how to check if a List Contains an Uppercase String in Java8 using Stream API and anyMatch() with a simple example.

Code Explanation (Step-by-Step)

  • Create a list of strings using Arrays.asList() .
  • Convert the list into a stream using stream().
  • Use the anyMatch() method to evaluate each element.
  • Convert each string to uppercase using toUpperCase().
  • Compare the original string with its uppercase version using equals().
  • If at least one string matches, anyMatch() returns true.
  • Print the Boolean type of output status.
				
					import java.util.Arrays;
import java.util.List;

public class MatchTest {

    public static void main(String[] args) {

        List<String> listString = Arrays.asList(
                "hibernate",
                "JAVA",
                "spring",
                "servlet",
                "jsp",
                "123"
        );

        boolean status = listString.stream()
                .anyMatch(e -> e.matches("[A-Z]+"));

        System.out.println("Uppercase word is there :- " + status);
    }
}

Output :
Uppercase word is there :- true

Java 8 Program to Find Uppercase Words Using Stream API

				
					import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class FindUppercaseWords {

    public static void main(String[] args) {

        List<String> listString = Arrays.asList(
                "hibernate",
                "JAVA",
                "spring",
                "SERVLET",
                "jsp",
                "123"
        );

        List<String> upperCaseWords = listString.stream()
                .filter(str -> str.equals(str.toUpperCase()) &&
                               str.matches("[A-Za-z]+"))
                .collect(Collectors.toList());

        System.out.println(upperCaseWords);
    }
}

Output :
[JAVA, SERVLET]

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