Java遍历Properties的四种方法

System.out.println("---------（方式一）------------");
for (String key : properties.stringPropertyNames()) {
    System.out.println(key + "=" + properties.getProperty(key));
}

System.out.println("---------（方式二）------------");
// 返回属性key的集合
Set<Object> keys = properties.keySet();
for (Object key : keys) {
    System.out.println(key.toString() + "=" + properties.get(key));
}

System.out.println("---------（方式三）------------");
// 返回的属性键值对实体
Set<Map.Entry<Object, Object>> entrySet = properties.entrySet();
for (Map.Entry<Object, Object> entry : entrySet) {
    System.out.println(entry.getKey() + "=" + entry.getValue());
}

System.out.println("---------（方式四）------------");
Enumeration<?> e = properties.propertyNames();
while (e.hasMoreElements()) {
    String key = (String) e.nextElement();
    String value = properties.getProperty(key);
    System.out.println(key + "=" + value);
}