如何从java源代码(从文件)中删除python中只有开始或结束括号的行？

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class CodeCleaner {
    public static void main(String[] args) {
        String inputFilePath = "input.java";  // 输入Java源代码文件路径
        String outputFilePath = "output.java";  // 输出处理后的Java源代码文件路径

        try {
            BufferedReader reader = new BufferedReader(new FileReader(inputFilePath));
            BufferedWriter writer = new BufferedWriter(new FileWriter(outputFilePath));

            String line;
            while ((line = reader.readLine()) != null) {
                // 使用正则表达式判断是否只有开始或结束括号的行
                if (!line.matches("\\s*\\{|\\}\\s*")) {
                    writer.write(line);
                    writer.newLine();
                }
            }

            reader.close();
            writer.close();

            System.out.println("处理完成！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}