一，为啥要学特殊文件

 

二， 常用方法:读取

三，案例

import java.io.FileReader;
import java.util.Properties;
import java.util.Set;public class Main {public static void main(String[] args) throws Exception {//1,创建一个键值对对象Properties properties =new Properties();System.out.println(properties);//2,加载数据到对象中去properties.load(new FileReader("untitled\\src\\prusidfn\\usfdc.properties"));System.out.println(properties);//3,操作一:根据键取值System.out.println(properties.getProperty("张三"));//4，操作二:遍历Set<String>keys = properties.stringPropertyNames();for (String key : keys) {String value = properties.getProperty(key);System.out.println("---->"+value);}}
}

 四，常用方法:写出

五，案例

import java.io.FileReader;
import java.util.Properties;
import java.util.Set;public class Main {public static void main(String[] args) throws Exception {//1,创建一个键值对对象Properties properties =new Properties();System.out.println(properties);//2,加载数据到对象中去properties.load(new FileReader("untitled\\src\\prusidfn\\usfdc.properties"));System.out.println(properties);//3,操作一:根据键取值System.out.println(properties.getProperty("张三"));//4，操作二:遍历Set<String>keys = properties.stringPropertyNames();for (String key : keys) {String value = properties.getProperty(key);System.out.println("---->"+value);}}
}