ExtensionMethodPlain.java

package de.plushnikov.extensionmethod;

import lombok.experimental.ExtensionMethod;

@ExtensionMethod({java.util.Arrays.class, ExtensionMethodPlain.Extensions.class})
public class ExtensionMethodPlain {
  public String test() {
    int[] intArray = {5, 3, 8, 2};
    intArray.sort();
    float[] intArray2 = {5, 3, 8, 2};
    intArray2.sort();

    String iAmNull = null;
    return iAmNull.or("hELlO, WORlD!".toTitleCase());
  }

  static class Extensions {
    public static <T> 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();
    }
  }
}