Data Structures (Properties) in Java

Example: Properties
The following program illustrates several of the methods supported by this data structure:

import java.util.*;
public class PropDemo {
public static void main(String args[]) {
Properties capitals = new Properties();
Set states;
String str;
capitals.put("Illinois", "Springfield");
capitals.put("Missouri", "Jefferson City");
capitals.put("Washington", "Olympia");
capitals.put("California", "Sacramento");
capitals.put("Indiana", "Indianapolis");
states = capitals.keySet();
Iterator itr = states.iterator();
while(itr.hasNext()) {
str = (String) itr.next();
System.out.println("The capital of " +
str + " is " + capitals.getProperty(str) + ".");
}
System.out.println();
str = capitals.getProperty("Florida", "Not Found");
System.out.println("The capital of Florida is "
+ str + ".");
}
}