* ( Data 流)有以下代码 public class Check{ public static void main(String args[]) throws Exception{ FileOutputStream fout = new FileOutputStream(“test.dat”); DataOutputStream dout = new DataOutputStream(fout); dout.writeInt(1); dout.writeDouble(0.01); dout.close(); } } 问:这个程序总共往文件中写入了多少字节?