将arrayList<Class>另存为文件室内的字符串

import com.google.gson.Gson;

// 将arrayList<Class>转换为JSON字符串
Gson gson = new Gson();
String jsonString = gson.toJson(arrayList);

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

// 将字符串保存到文件
try (BufferedWriter writer = new BufferedWriter(new FileWriter("output.txt"))) {
    writer.write(jsonString);
} catch (IOException e) {
    e.printStackTrace();
}