Java集合——Properties

• Properties
• • 特点
  • 构造
  • 方法
  • 示例

属性集合，线程安全

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

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

public class PropertiesDemo1 {
    public static void main(String[] args) throws IOException {
        Properties properties = new Properties();
        properties.put("name","zhangsan");
        properties.put("age","16");
        properties.put("sex","男");
        System.out.println(properties.toString());
        Set strings = properties.stringPropertyNames();
        strings.forEach(x->{
            System.out.println(x);
        });
        //流相关
        PrintWriter printWriter = new PrintWriter("C:\Users\Syf200208161018\Desktop\neww.txt");
        properties.list(printWriter);
        printWriter.close();

        FileOutputStream fileOutputStream = new FileOutputStream("C:\Users\Syf200208161018\Desktop\neww.properties");
        properties.store(fileOutputStream,null);
        fileOutputStream.close();

        FileReader fileReader = new FileReader("C:\Users\Syf200208161018\Desktop\neww.txt");
        Properties pr = new Properties();
        pr.load(fileReader);
        fileReader.close();
        System.out.println(pr.toString());
    }
}