import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;
import ohos.hiviewdfx.HiLogConst;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.PushbackInputStream;

public class PushbackInputStreamExample {
    private static final HiLogLabel LABEL = new HiLogLabel(HiLogConst.DEBUG, 0x00201, "PushbackInputStreamExample");

    public static void main(String[] args) {
        // 创建一个包含数据的字节数组
        byte[] data = "Hello, HarmonyOS!".getBytes();

        try {
            // 创建ByteArrayInputStream对象，用于从字节数组读取数据
            ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(data);

            // 创建PushbackInputStream对象，将其包装为字节输入流
            PushbackInputStream pushbackInputStream = new PushbackInputStream(byteArrayInputStream);

            // 读取字节数据
            int byteRead = pushbackInputStream.read();
            HiLog.info(LABEL, "Read byte: {}", (char) byteRead);

            // 推回读取的字节
            pushbackInputStream.unread(byteRead);

            // 再次读取字节数据
            byteRead = pushbackInputStream.read();
            HiLog.info(LABEL, "Read byte again: {}", (char) byteRead);

            // 关闭流
            pushbackInputStream.close();

        } catch (IOException e) {
            HiLog.error(LABEL, "发生错误：{}", e.getMessage());
        }
    }
}