Java Basics-Day 22nd

Day22:

IO Stream Overall:

Standard input/output stream

Convert stream

InputStreamReader: Byte stream "Data Trend"

OutputStreamWriter: Character Flow byte stream

Print Flow:

PrintStream

PrintWriter

You can manipulate the file directly:

constructor method, whether to accept both file and string type arguments

FileReader FileWriter FileInputStream Fileoutoutstream printstream

PrintWriter:

Construction method

"Access Denied" exception may appear in Read folder

Print () method ~

Serialization: Input An object in the same way as a stream

ObjectInputStream--Object readobject ()

Deserialization: Restoring a Stream object to an object

ObjectOutputStream--void WriteObject (Object obj)

Serialization ID value fixed

A: The object of the class wants to be serialized stream operation, please serialize the interface;

B: Class implements the serializable interface, resolves the Yellow line warning, and the fixed ID value.

Coding issues:

Encoding table: the characters and their corresponding values are saved in a single table

Properties:

Represents a collection of properties that can be loaded from a stream or stored in a stream with a key value of string

No generics, only a collection that can be used in conjunction with IO streams

String getProperties (String key):

String GetProperties (String key,string defaultvalue):

Object setproperties (String key,string value):

Set<string> Stringpropertieyname ():

System Properties

public static Properties GetProperties (): System Property Set

Combination of collection and IO streams:

List () Method: Stores the data key value pairs in the collection in a file

Load () method: reads the data from the file into the collection "The data is the mode of the key-value pair-delimiter"

Store () method

Java Basics-Day 22nd