Properties类属性集合

Properties类属性集合

特点：

1.存储属性名和属性值

2.属性名和属性值都是字符串类型

3.没有泛型

4.和流有关

package com.tiedandan.IO流.Properties集合;

import java.io.*;
import java.util.Properties;
import java.util.Set;

public class application {
    public static void main(String[] args) throws IOException {
        //创建集合
        Properties properties = new Properties();
        //添加数据
        properties.setProperty("username","张三");
        properties.setProperty("age","20");
        //输出
        System.out.println(properties.toString());
        //遍历
        Set<String> pronames =properties.stringPropertyNames();
        for (String proname : pronames) {
            System.out.println(proname+"--"+properties.getProperty(proname));
        }
        //和流有关的方法
        //---------list方法------
//
        //2.store方法保存
//
        //3.load方法加载
        Properties properties2 = new Properties();
        FileInputStream fis = new FileInputStream("d:\\store.properties");
        properties2.load(fis);
        fis.close();
        System.out.println(properties2.toString());


    }
}