无涯教程-Java - Properties 类函数

Properties是Hashtable的子类。它用于维护值列表，其中键是字符串，并且值也是字符串。

属性(Properties)定义以下变量。此变量保存与Properties对象关联的默认属性列表。

Properties defaults;

以下是properties类提供的构造函数的列表。

除了Hashtable定义的方法外，Properties还定义了以下方法-

Properties 示例

以下程序说明了此数据结构支持的几种方法-

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");

      //在哈希表中显示所有州和首都。
      states=capitals.keySet();   //获取键的集合视图
      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();

      //查找不在列表中的状态——指定默认值
      str=capitals.getProperty("Florida", "Not Found");
      System.out.println("The capital of Florida is " + str + ".");
   }
}

这将产生以下输出-

The capital of Missouri is Jefferson City.
The capital of Illinois is Springfield.
The capital of Indiana is Indianapolis.
The capital of California is Sacramento.
The capital of Washington is Olympia.

The capital of Florida is Not Found.

参考链接

https://www.learnfk.com/java/java-properties-class.html