Properties类继承HashTable类，一般用来给程序配置属性文件。

package com.itcast.demo04.Prop;

import jdk.internal.util.xml.impl.ReaderUTF8;import sun.nio.cs.UTF_32;import sun.nio.cs.ext.GBK;

import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.util.Properties;import java.util.Set;

/** * @author newcityman * @date 2019/7/28 - 12:50 */public class Demo01Properties {    public static void main(String[] args) throws IOException {//        show01();//        show02();        show03();

    }

    private static void show03() throws IOException {        Properties prop = new Properties();        prop.load(new FileReader("day18_IOAndProperties\\prop.txt"));        Set<String> key = prop.stringPropertyNames();        for (String s : key) {            String value = prop.getProperty(s);            System.out.println(s+"==>"+value);        }    }

    private static void show02() throws IOException {        Properties prop = new Properties();        prop.setProperty("张曼玉","16");        prop.setProperty("张学友","20");        prop.setProperty("刘德华","18");

        FileWriter fw = new FileWriter("day18_IOAndProperties\\prop.txt");

        prop.store(fw, "data");    }

    private static void show01() {        Properties prop = new Properties();        prop.setProperty("zmy","12");        prop.setProperty("zyy","20");        prop.setProperty("lm","15");        prop.setProperty("zgh","16");        Set<String> strings = prop.stringPropertyNames();        for (String key : strings) {            String value = prop.getProperty(key);            System.out.println(key+"====>"+value);        }

    }}

原文地址：https://www.cnblogs.com/newcityboy/p/11258934.html