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  1. import java.util.*;
  2. class Odai12151 {
  3.     static class Context {
  4.         static interface State {
  5.             String reply(String s);
  6.         }
  7.         private State state = (s) -> null;
  8.         private Map<String, State> map = new HashMap<>();
  9.         public Context() {
  10.             map.put("wake up", (s) -> "hi".equals(s) ? "hello" : null);
  11.             map.put("sleep", (s) -> "hi".equals(s) ? "zzz..." : null);
  12.         }
  13.         private void p(String s) {
  14.             if (s != null) System.out.println(s);
  15.         }
  16.         public void execute(String s) {
  17.             p(state.reply(s));
  18.             if (map.containsKey(s)) state = map.get(s);
  19.         }
  20.     }
  21.     public static void main(String[] args) {
  22.         Context c = new Context();
  23.         String[] messages = {"hi", "wake up", "hi", "sleep", "hi", "bye"};
  24.         for (String m : messages) {
  25.             System.out.println(">> " + m);
  26.             c.execute(m);
  27.         }
  28.     }
  29. }
  30.  
Success #stdin #stdout 0.21s 2184192KB
comments (?)
stdin 
Standard input is empty
stdout 
>> hi
>> wake up
>> hi
hello
>> sleep
>> hi
zzz...
>> bye
https://ideone.com/fpKVdM
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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