Consider the following interface type:

public interface Filter
{
    boolean accept(Object x);
}

Classes that implement Filter supply criteria used to accept the object x. For example, a StringFilter class might accept strings that are three characters or less in length. If sf is a StringFilter object, then sf.accept("abc") returns true, while sf.accept("abcd") returns false.

Write the StringFilter class. Recall that the String class has a method of no arguments called length that returns the length of the implicit argument.