I understand in IO stream

In/outputstream processing byte reader/out processing characters

In/out Putstream can read: Byte numbers, string strings, files, network? In/out Putstream is an abstract class

eg

FileOutputStream ops=new FileOutputStream ();

.......

Ops.close.

eg

DataOutputStream out=new DataOutputStream (New FileOutputStream ("E:\\demo\\abc2.txt)");
Out.write ();
OUT.WITEUTF ("China");
Out.flush ();
Out.close ();

Java serialization technology can parse a Java object into a byte array and write it to the output stream, which enables Java objects to be saved to the hard disk file or output to the network

I understand in IO stream