Pattern matching example

patternmatching

package datastructures;
// Possible syntax extensions; won't compile for any version of Java.
public class PatternMatchExample {
public static String match(Object obj) {
switch (obj) {
case EMPTY:
// Is it an empty list?
return "()";
case NonEmptyList(1, 2): // A list with 1 and 2?
return "(1,(2,())";
case List<?> list(head,tail): // Any other List? Create head, tail variables
return "("+head+","+match(tail)+")";
default:
// Not a List!!
return "unrecognized object!";
}
}
}