Use of Properties related to java I/O Technology

Package ioTest. io3;/* Properties is a subclass of hashtable. * That is to say, it has the characteristics of map sets, in addition, the key-value pairs stored in it are strings * a collection container that combines io technology **. This object features a configuration file that can be used in the form of key-value pairs */import java. util. properties; public class PropertiesDemo {public static void main (String [] args) {// TODO Auto-generated method stubsetAndGet ();} public static void setAndGet () {Properties pro = new Properties (); pro. setProperty ("liu", "28"); pro. setProperty ("hu", "27"); System. out. println ("hu:" + pro. getProperty ("hu"); // how to traverse // for (Properties p: pro) // {//}/** the preceding statement fails: can only iterate over an array or * an instance of java. lang. iterable ** // The returned result is a set

 
  
The for (String s: pro. stringPropertyNames () {System. out. println (s + ":" + pro. getProperty (s ));}}}