Qianfengday20-java Basic Learning: Data flow, random read file stream randomaccessfile

Course review:

Flow:
Conversion Flow: Conversion of characters and bytes
Object flow: serialization, deserialization

Print Flow: Print data of various data types

Today's content:
Data stream: Supports writing out the basic data type, byte stream, processing stream
1, DataOutputStream: Data output byte stream
Common methods:
WriteXXX: Write data for a basic data type
writeUTF: Writing out a string
2, DataInputStream: data input byte stream
Common methods:
READXXX: Reading data of the base data type
readUTF: Reading a string

Random read File class: A way to write and read basic data types
Randomaccessfile
Mode:
1, R: Read Only
2. RW: Read and Write
3, RWS: Read and write, and timely refresh the file content and meta-data
4, RWD: Read and write, and timely refresh the contents of the file

Common methods:
Read: reads, bytes
READXXX: Reading basic data types
readUTF: Reading a string
Length: File size
SetLength: Setting File size
Seek: Sets the location of the file pointer (index)
Getfilepointer: Get file pointer
Write: Write, byte
WriteXXX: Write the basic data type
writeUTF: Writing out a string
Close: Off

File class:
Renameto
Delete
List
Listfiles
FilenameFilter

Flow: A conduit for data communication
Flow of data: file, memory, network
Classification of streams:
1. Direction
2. Units
3. function

Common streams:
Node Flow:
1, File Stream (FILEXXX): Manipulate the flow of files, data stored in the file
2. Memory Stream (BYTEARRAYXXX): Flow of operating memory, data stored in memory
Processing Flow:
3. Buffer Stream (BUFFEREDXXX): Improve reading and writing efficiency
4. Conversion stream (character stream): conversion between byte stream and character stream, can specify encoding format------only characters, divided into input, output
5, Object Flow (OBJECTXXX): Serialization and deserialization, support a variety of data types-----Only byte stream, divided into input, output
6. Print Stream (PRINTXXX): Print various data types-------only output, divided into characters and bytes
7, Data stream (DATAXXX): Read and write out the basic data type, string-------only bytes, divided into input, output

8, Random Read file class: Randomaccessfile
Modes: R, RW, RWS, RWD
For reading and writing methods, basic data and strings

Collections: Dynamically Storing multiple objects
1, collection<e>
1, list<e>
1.
2.
2, set<e>
1.
2.
3.
2, map<k,v>
1.
2.
3.

Qianfengday20-java Basic Learning: Data flow, random read file stream randomaccessfile