es, interfaces and enums.
 </p>

 <h3 id="usage">Usage</h3>

 <p>
 The below constant fields:
 </p>

 <pre>
 package com.example;

 public class Foo {
     public static final String FOO1 = "foo1";
     public static final String FOO2 = "foo2";
 }
 </pre>

 <pre>
 package com.example;

 public interface Bar {
     public static final String BAR1 = "bar1";
     public static final String BAR2 = "bar2";
 }
 </pre>

 <pre>
 package com.example;

 public enum Baz {
     BAZ1, BAZ2;
 }
 </pre>

 <p>
 Can be impo