关于Properties 集 添加数据 遍历数据

 1 public static void fun1(){
 2         Properties v = new Properties();
 3         v.setProperty("a","1");
 4         v.setProperty("a1","11");
 5         v.setProperty("a2","111");
 6         System.out.println(v);
 7         // 获取键值
 8         String s = v.getProperty("a");
 9         // 根据 键 获取 值
10         System.out.println(s);
11         //将集合中的键  存储到Set集合
12         Set<String> set = v.stringPropertyNames();
13         for(String k:set){
14             //System.out.println(k);
15             String value = v.getProperty(k);
16             System.out.println(k+":"+value);
17         }
18     }