import lombok.experimental.ExtensionMethod; @ExtensionMethod({java.util.Arrays.class, ExtensionMethodPlain.Extensions.class}) class ExtensionMethodPlain { static class Extensions { Extensions() { super(); } public static T or(T obj, T ifNull) { return ((obj != null) ? obj : ifNull); } public static String toTitleCase(String in) { if (in.isEmpty()) return in; return (("" + Character.toTitleCase(in.charAt(0))) + in.substring(1).toLowerCase()); } } ExtensionMethodPlain() { super(); } public String test() { int[] intArray = {5, 3, 8, 2}; java.util.Arrays.sort(intArray); String iAmNull = null; return ExtensionMethodPlain.Extensions.or(iAmNull, ExtensionMethodPlain.Extensions.toTitleCase("hELlO, WORlD!")); } }