From f02a8b7cb4f2d9747fb6c5f5e5c1c9d6d9dfb188 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 11 Aug 2026 14:40:52 +0800
Subject: [PATCH] =?UTF-8?q?s-day09-Properties=20=E7=9A=84=E7=89=B9?=
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---
 .../src/com/inmind/properties06/Demo17.java   | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 s-day09/src/com/inmind/properties06/Demo17.java

diff --git a/s-day09/src/com/inmind/properties06/Demo17.java b/s-day09/src/com/inmind/properties06/Demo17.java
new file mode 100644
index 0000000..7f65e38
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+++ b/s-day09/src/com/inmind/properties06/Demo17.java
@@ -0,0 +1,38 @@
+package com.inmind.properties06;
+
+import java.util.Properties;
+import java.util.Set;
+
+/*
+Properties 的特点与基本使用(重点)
+
+    构造方法
+    public Properties() :创建一个空的属性列表。
+
+    常用的存储方法
+    public Object setProperty(String key, String value) ： 保存一对属性。
+    public String getProperty(String key) ：使用此属性列表中指定的键搜索属性值。
+    public Set<String> stringPropertyNames() ：所有键的名称的集合。  类似keySet()
+
+    注意:
+        1.Properties类似一个HashMap
+        2.它的真正作用是,能够将指定的配置文件的信息读取到properties对象中
+ */
+public class Demo17 {
+    public static void main(String[] args) {
+        //1.创建属性集对象
+        Properties properties = new Properties();
+        //2.保存属性集
+        properties.setProperty("username","admin");
+        properties.setProperty("password", "1234");
+        System.out.println(properties);//toString()
+        //3.获取属性值
+        String username = properties.getProperty("username");
+        String password = properties.getProperty("password");
+        System.out.println(username);
+        System.out.println(password);
+        //4.获取属性集的所有键
+        Set<String> keys = properties.stringPropertyNames();
+        System.out.println(keys);
+    }
+}