Have you used static methods in Java to implement utility functions?

Yes, in Java, static methods are often used to implement utility functions, especially if these functions do not depend on the state of an object.

For example, the java.lang.Math class contains many static methods for mathematical operations.

In Android development, you can create your own utility classes with a set of static methods for:

• string processing,
• working with dates,
• data conversion,
• condition checks, etc.

Example:

public class StringUtils {
    public static boolean isNullOrEmpty(String s) {
        return s == null || s.isEmpty();
    }
}

// Usage:
boolean empty = StringUtils.isNullOrEmpty(myString);