Properties集合
- java.util.Properties 集合 extends Hashtable implements Map<k,v>
- Properties是一个持久的属性集,可通过流保存到硬盘,或通过流从硬盘中加载到内存
- Properties是唯一一个和IO流相结合的集合
- Properties的key值和value值都是字符串
常用的方法
properties.setProperty("1","张三");
properties.setProperty("2","李四");
Set<String> strings = properties.stringPropertyNames();
for (String key : strings) {
String value = properties.getProperty(key);
System.out.println(key+"="+value);
}
Properties properties= new Properties();
FileWriter file = new FileWriter("e.txt");
properties.store(file,"save");
Properties prop = new Properties();
FileReader file = new FileReader("e.txt");
prop.load(file);