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  1. import java.util.*;
  2.  
  3. class Ideone {
  4. 	public static void main (String[] args) throws Exception {
  5. 		Json v = Json.dict()
  6. 			.put("name", "John Lennon")
  7. 			.put("email", "foobar@gmail.com")
  8. 			.put("phone", "+81-90-0000-0000")
  9. 			.put("occupation", Json.array("Programmer", "System Engineer"))
  10. 			.put("language", Json.array("Japanese", "English", "Spanish", "Chinease"))
  11. 			.put("hobby", Json.array("Photography", "Traveling", "Fishing", "Onsen"))
  12. 		;
  13.  
  14. 		System.out.println("--property-------------------");
  15. 		System.out.println( "v[language][2] = " + v.get("language").get(2) );
  16.  
  17. 		System.out.println("--for------------------------");
  18. 		for(Map.Entry<Json,Json> et : v.eachDict()){
  19. 			System.out.println(et.getKey() + "=" + et.getValue());
  20. 		}
  21.  
  22. 		System.out.println("--toString-------------------");
  23. 		System.out.println(v);
  24. 	}
  25. }
  26.  
  27.  
  28.  
  29.  
  30. class Json {
  31. 	static JsonDict  dict(){return new JsonDict();}
  32. 	static JsonArray array(Object... args){return new JsonArray(args);}
  33. 	static Json toJson(Object v){ return v instanceof Json ? (Json)v : new JsonValue(v); }
  34.  
  35. 	Iterable<Map.Entry<Json,Json>> eachDict(){throw new UnsupportedOperationException();}
  36. 	Iterable<Json> each(){throw new UnsupportedOperationException();}
  37. 	Json key(){throw new UnsupportedOperationException();}
  38. 	Json val(){throw new UnsupportedOperationException();}
  39. 	boolean containsKey(Object k){throw new UnsupportedOperationException();}
  40. 	Json get(Object k){throw new UnsupportedOperationException();}
  41. 	Json get(int index){throw new UnsupportedOperationException();}
  42. 	Object raw(){throw new UnsupportedOperationException();}
  43. }
  44. class JsonValue extends Json {
  45. 	private Object v;
  46. 	JsonValue(Object v){this.v=v;}
  47. 	@Override Object raw(){return v;}
  48. 	@Override public String toString(){
  49. 		if(v == null){return "null";}
  50. 		if(v instanceof Number){return String.valueOf(v);}
  51. 		String vs = String.valueOf(v);
  52. 		return "\""+vs.replace("\\","\\\\").replace("\"","\\\"")+"\"";
  53. 	}
  54. 	@Override public int hashCode(){return v==null ? 0 : v.hashCode();}
  55. 	@Override public boolean equals(Object o){
  56. 		if(o == null || o.getClass() != JsonValue.class){return false;}
  57. 		Object v2 = ((JsonValue)o).raw();
  58. 		return v==null ? v==v2 : v.equals(v2);
  59. 	}
  60. }
  61. class JsonDict extends Json {
  62. 	private Map<Json,Json> m = new HashMap<Json,Json>();
  63. 	JsonDict put(Object k, Object v){
  64. 		m.put(toJson(k),toJson(v));
  65. 		return this;
  66. 	}
  67. 	@Override boolean containsKey(Object k){ return m.containsKey(toJson(k)); }
  68. 	@Override Json get(Object k){
  69. 		Json r = m.get(toJson(k));
  70. 		if(r == null){throw new IllegalArgumentException("undefined ["+k+"]");}
  71. 		return r;
  72. 	}
  73. 	@Override Iterable<Map.Entry<Json,Json>> eachDict(){return m.entrySet();}
  74. 	@Override public String toString(){
  75. 		StringBuilder sb = new StringBuilder();
  76. 		sb.append("{");
  77. 		int i=0;
  78. 		for(Map.Entry<Json,Json> et : m.entrySet()){
  79. 			sb.append(i++ != 0 ? ", " : "").append(et.getKey()+":"+et.getValue());
  80. 		}
  81. 		sb.append("}");
  82. 		return sb.toString();
  83. 	}
  84. }
  85. class JsonArray extends Json {
  86. 	private List<Json> l = new ArrayList<Json>();
  87. 	JsonArray(Object[] v){
  88. 		for(Object et : v){ l.add(toJson(et)); }
  89. 	}
  90. 	@Override Json get(int index){ return l.get(index); }
  91. 	@Override Iterable<Json> each(){return l;}
  92. 	@Override public String toString(){return l.toString();}
  93. }
  94.  
Success #stdin #stdout 0.04s 320576KB
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--property-------------------
v[language][2] = "Spanish"
--for------------------------
"occupation"=["Programmer", "System Engineer"]
"phone"="+81-90-0000-0000"
"name"="John Lennon"
"language"=["Japanese", "English", "Spanish", "Chinease"]
"email"="foobar@gmail.com"
"hobby"=["Photography", "Traveling", "Fishing", "Onsen"]
--toString-------------------
{"occupation":["Programmer", "System Engineer"], "phone":"+81-90-0000-0000", "name":"John Lennon", "language":["Japanese", "English", "Spanish", "Chinease"], "email":"foobar@gmail.com", "hobby":["Photography", "Traveling", "Fishing", "Onsen"]}
https://ideone.com/Z683HJ
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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