如何在不删除旧值的情况下写入属性文件

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

public class PropertyFileWriter {
    public static void main(String[] args) {
        // 属性文件路径
        String filePath = "config.properties";

        try {
            // 读取属性文件
            Properties properties = new Properties();
            FileInputStream fileInputStream = new FileInputStream(filePath);
            properties.load(fileInputStream);
            fileInputStream.close();

            // 修改属性值
            properties.setProperty("key", "new value");

            // 写入属性文件
            FileOutputStream fileOutputStream = new FileOutputStream(filePath);
            properties.store(fileOutputStream, null);
            fileOutputStream.close();

            System.out.println("属性文件写入成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}