stream sets

Package Org.example.io;Import Java.io.ByteArrayInputStream;Import java.io.IOException;/*** Bytearrayinputstream: Pass in the array when creating the object, do not need to pass the file, there is no new method, close () Close invalid* The stream itself is an in-memory resource, and the content in the stream is also a resource in memory, so the memory is freed without manual shutdown, so there is no need to

Print Flow:There are two classes: The Printstream,printwriter class, the two class method is consistent, the difference is that the constructorPrintStream: Construction Method: Receive file type, receive string file name, receive byte output stream (OutputStream)Pringwriter: Construction Method: Receive file type, receive string file name, receive byte output stream (OutputStream), receive character output

Use of data flow (stream) 1) Stream's acquisition ① through the collection collection get 1 list2 stream ② is obtained by array 1 String[] Array = {"Are", "You", "OK"};2 stream3 4 Handling of primitive type arrays5 Int[] array = {1,2,3,4,5};6 stream ③ by value (as far as possible using the above 2 ways to get, this way there are defects) 1

1. Convert a picture to a binary stream: done by FileInputStream Public Static byte[] Change_to_stream (String path) {byte[] Imagebytes =NULL;　　　　//Use Try-with-resourse directly here, you can not manually close the resources Try(FileInputStream FileInputStream =NewFileInputStream (NewFile (path));) {Imagebytes=New byte[Fileinputstream.available ()]; Fileinputstream.read (imagebytes); } Catch(IOException e) {e.printstacktrace (); }

The Java Buffer stream itself does not have IO functionality, but adds buffering to other streams to improve efficiency, such as loading a wrapper over another stream. When the file or other target frequently read or write or operate inefficient, poor performance. This allows for more efficient reading and writing of information using buffered streams. Because the buffered

Use of generic sets, use of generic Sets The restructuring of the data room charging system is nothing more than adding, deleting, modifying, and querying four database operations. In addition, we use a three-tier architecture for reconstruction, and layer D is used to deal with databases. To perform these four operations, we need to return values. addition, deletion, and modification are not mentioned here

UIButton sets the shadow effect and uibutton sets the shadow effect. UIButton sometimes needs to use code to adjust the style, including adding a shadow.As shown in the login buttonIn this case, you need to consider setting the button layer. Button layer sets the following attributes CornerRadius; ShadowOffset ShadowOpacity; ShadowColor; The Code is as

Common character sets and solutions for Oracle character setsOne. View the character set:1. Query the service-side character set:Select Userenv (' language ') from dualOrSELECT * FROM Nls_database_parameters2. Query the client:SELECT * FROM Nls_instance_parametersProblems such as garbled characters in the client character set and the service-side character set will occur3. Session Character Set: select * from Nls_session_parameters Two. Modify the ch

The IO stream in Java is divided into byte stream and character stream, and each stream also divides the input stream and the output stream.Let's start with the input and output streams: the input and output are for program memory, so the input is to write data to the memory

means. Similar to the voltage in the circuit of high, low, transistor conduction and cutoff. 2) Binary number operation is simple, greatly simplifies the calculation of the structure of the operational components. The addition and multiplication of binary numbers are as follows: 0+0=0 0+1=1+0=1 1+1=10 0x0=0 0x1=1x0=0 1x1=1 Because the binary number in the use of the median number is too long, not easy to remember, so the hexadecimal number is proposed. 3. Byte

2017-11-05 20:15:28 Sequenceinputstream SequenceinputStream:SequenceInputStreamRepresents a logical concatenation of other input streams. It starts with an ordered collection of input streams and reads from the first input stream until the end of the file is reached, then reads from the second input stream, and so on, until the end of the file containing the last input

Random access Flow, using mark (Mark) to mark the location of the stream, contains two methods of tell and seek; Tell, which is the return stream Mark's location, contains G and P two versions. g denotes get, refers to the input stream; P means put, the output stream; Seek is a jump to the position indicated by the

BYTE streamIn the I/O class library, Java.io.InputStream and java.io.OutputStream represent byte input streams and byte output streams, which are abstract classes that cannot be instantiated, and the smallest unit in the data flow is bytes, so it is called a byte stream.The method of reading data in InputStream is as follows:1, int read ()Function: Reads a byte of data, and returns the read data, and if 1 is returned, it reads to the end of the input stream