在windows电脑连接安卓设备的环境下：使用java写一段代码：1.发送adb命令“adb reboot”；2.循环发送"adb devices"命令并等待1秒，直到返回已连接adb设备，退出循环；3.循环获取并输出getRestoreStatus()方法的值，30秒后退出循环

以下是可以回答的代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ADBConnection {
    public static void main(String[] args) throws InterruptedException {
        try {
            // 发送adb命令"adb reboot"
            Runtime.getRuntime().exec("adb reboot");
            
            // 循环发送"adb devices"命令并等待1秒，直到返回已连接adb设备，退出循环
            boolean deviceConnected = false;
            while (!deviceConnected) {
                Process process = Runtime.getRuntime().exec("adb devices");
                BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
                String line;
                while ((line = reader.readLine()) != null) {
                    if (line.contains("device")) {
                        deviceConnected = true;
                        break;
                    }
                }
                reader.close();
                Thread.sleep(1000);
            }
            
            // 循环获取并输出getRestoreStatus()方法的值，30秒后退出循环
            long startTime = System.currentTimeMillis();
            while (System.currentTimeMillis() - startTime < 30000) {
                String restoreStatus = getRestoreStatus();
                System.out.println(restoreStatus);
                Thread.sleep(1000);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static String getRestoreStatus() throws IOException {
        Process process = Runtime.getRuntime().exec("adb shell dumpsys backup");
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line;
        while ((line = reader.readLine()) != null) {
            if (line.contains("Restore session currently")) {
                reader.close();
                return line;
            }
        }
        reader.close();
        return "";
    }
}

以上代码实现了上述要求，先发送"adb reboot"命令重启设备，之后循环发送"adb devices"命令并等待1秒，直到返回已连接adb设备，然后循环获取并输出getRestoreStatus()方法的值，30秒后退出循环，每隔1秒输出一次。注意，需要安装ADB并配置好环境变量才能正常运行此代码。