Java Properties 类

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");

    // Show all states and capitals in hashtable.
    states = capitals.keySet(); // get set-view of keys
    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();

    // look for state not in list -- specify default
    str = capitals.getProperty("Florida", "Not Found");
    System.out.println("The capital of Florida is " + str + ".");
}

}