Java如何使用首选项API？这些变量存储在哪里？

import com.tencent.cloud.common.profile.ClientProfile;
import com.tencent.cloud.common.profile.DefaultProfile;
import com.tencent.cloud.common.profile.HttpProfile;
import com.tencent.cloud.common.profile.TencentProfile;
import com.tencent.cloud.common.profile.YunGProfile;

public class Main {
    public static void main(String[] args) {
        // 创建 TencentProfile 对象
        TencentProfile tencentProfile = new TencentProfile("your_access_id", "your_secret_id", "your_token", "your_region");

        // 创建 HttpProfile 对象
        HttpProfile httpProfile = new HttpProfile();
        httpProfile.setEndpoint("your_endpoint_url");

        // 创建 ClientProfile 对象
        ClientProfile clientProfile = new ClientProfile();
        clientProfile.setHttpProfile(httpProfile);

        // 创建 YunGProfile 对象
        YunGProfile yunGProfile = new YunGProfile();

        // 使用首选项 API 设置环境变量
        tencentProfile.setEnvironmentVars();
        clientProfile.setEnvironmentVars();
        yunGProfile.setEnvironmentVars();
    }
}