String str1 = "hello world"; String str2 = "HELLO WORLD"; boolean isEqual = StringUtils.equalsIgnoreCase(str1, str2); System.out.println(isEqual); // trueThis method is particularly useful when comparing user input with predefined values, as it allows for more flexible matching without having to worry about capitalization. The Apache Commons Lang library can be downloaded from the Apache website or included as a dependency in your Maven or Gradle project.