finite automata example (#1364)

algorithms/src/main/java/com/baeldung/automata/State.java

@@ -0,0 +1,29 @@
+package com.baeldung.automata;
+
+/**
+ * State. Part of a finite state machine.
+ */
+public interface State {
+
+	/**
+	 * Add a Transition to this state.
+	 * @param tr Given transition.
+	 * @return Modified State.
+	 */
+	State with(final Transition tr);
+
+    /**
+     * Follow one of the transitions, to get 
+     * to the next state.
+     * @param c Character.
+     * @return State.
+     * @throws IllegalStateException if the char is not accepted.
+     */
+    State transit(final CharSequence c);
+    
+    /**
+     * Can the automaton stop on this state?
+     * @return true or false
+     */
+    boolean isFinal();
+}