function Hashtable(){this.clear=hashtable_clear;this.containsKey=hashtable_containsKey;this.containsValue=hashtable_containsValue;this.get=hashtable_get;this.isEmpty=hashtable_isEmpty;this.keys=hashtable_keys;this.put=hashtable_put;this.remove=hashtable_remove;this.size=hashtable_size;this.toString=hashtable_toString;this.values=hashtable_values;this.hashtable={};}
function hashtable_clear(){this.hashtable={};}
function hashtable_containsKey(key){var exists=false;for(var i in this.hashtable){if(i==key&&this.hashtable[i]!=null){exists=true;break;}}
return exists;}
function hashtable_containsValue(value){var contains=false;if(value!=null){for(var i in this.hashtable){if(this.hashtable[i]==value){contains=true;break;}}}
return contains;}
function hashtable_get(key){return this.hashtable[key];}
function hashtable_isEmpty(){return(parseInt(this.size())==0)?true:false;}
function hashtable_keys(){var keys=new Array();for(var i in this.hashtable){if(this.hashtable[i]!=null)
keys.push(i);}
return keys;}
function hashtable_put(key,value){if(key==null||value==null){throw"NullPointerException {"+key+"},{"+value+"}";}else{this.hashtable[key]=value;}}
function hashtable_remove(key){var rtn=this.hashtable[key];this.hashtable[key]=null;return rtn;}
function hashtable_size(){var size=0;for(var i in this.hashtable){if(this.hashtable[i]!=null)
size++;}
return size;}
function hashtable_toString(){var result="";for(var i in this.hashtable)
{if(this.hashtable[i]!=null)
result+="{"+i+"},{"+this.hashtable[i]+"}\n";}
return result;}
function hashtable_values(){var values=new Array();for(var i in this.hashtable){if(this.hashtable[i]!=null)
values.push(this.hashtable[i]);}
return values;}