import java.util.Enumeration;

 import java.util.Iterator;

 import java.util.Properties;

 import java.util.Set;

 public class PropertiesDemo {

     public static void main(String[] args) {

         Properties properties = new Properties();

         properties.put("zhangsan", "23");

         properties.put("lisi", "25");

         properties.put("wangwu", "21");

         properties.put("zhaoliu", "27");

         Set<String> names = properties.stringPropertyNames();

         //使用高级for遍历

         for(String name : names) {

             String value = properties.getProperty(name);

             System.out.println(name + " = " + value);

         }

         //使用迭代器遍历

         Iterator<String> iterable = names.iterator();

         while(iterable.hasNext()){

             String key = iterable.next();

             String value = properties.getProperty(key);

             System.out.println(key +" = " + value);

         }

         //使用枚举遍历

         Enumeration<String> enumeration = (Enumeration<String>)properties.propertyNames();

         while(enumeration.hasMoreElements()) {

             String key = enumeration.nextElement();

             String value = properties.getProperty(key);

             System.out.println(key + " = " + value);

         }

     }

 }