MinLenFourShenanigans.java

package index;

public class MinLenFourShenanigans {
    public static boolean isInterned(Object value) {
        if (value == null) {
            // nothing to do
            return true;
        } else if (value instanceof String) {
            // Used to issue the below error.
            // MinLenFourShenanigans.java:7: warning: [cast.unsafe] "@MinLen(0) Object" may not be casted to the type "@MinLen(4) String"
            return (value == ((String) value).intern());
        }
        return false;
    }

    public static boolean isInterned2(Object value) {
        if (value instanceof String) {
            return (value == ((String) value).intern());
        }
        return false;
    }
}