双击jar包运行,出现使用压缩软件打开的情况

LStrawberry:

[code=java]

public class DateOutputStream02 {

public static void main(String[] args )throws IOException {

DateOutputStream dos=new DateOutputStream(new FileOutputStream("date02"));

dos.writeByte(100);

dos.writeShort(200);

dos.writeInt(300);

dos.writeLong(400L);

dos.writeFloat(456F);

dos.writeDouble(99.99);

DateInputStream dis=new DateInoutStream(new FileInputStream("date02"));

System.out.println(dis.readByte());

System.out.println(dis.readInt());

System.out.println(dis.readBoolean());

System.out.println(dis.readShort());

System.out.println(dis.readLong());

System.out.println(dis.readDouble());

dis.close();

dos.close();

}

}

[/code]为啥我照着敲了 好多报错 例如 dos.writeByte 中writeByte下又曲线 再例如：System.out.println(dis.readByte()); 中readByte有下划线