** * It's briefer still when the method is statically imported, which is * how we shall wrap strings for permutation from here on in. */ /** * It's slightly more convenient to use the static methods on the * Permute class to create Permutable wrappers for common types * such as strings, arrays and lists. Note * the fluent interface the permute method returns the Permutable it * was passed, and the toString() method recovers the String it wrapped. toString() ĪssertEqual( r0, "smite") // the identity permutation changes nothing /** * As per its definition, the identity permutation does nothing. */ String r0 = new PermutableString( "smite"). ** * We can apply permutations to Strings with a small "Permutable" * wrapper that allows the String elements to be manipulated by our * Permutations. SIMPLE PERMUTATIONS /** * Let's start off by creating the simplest permutation: the identity * permutation, in this case over 5 elements.
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