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How do you write and read from ByteBuffer in Java?

By Angel Hume

How do you write and read from ByteBuffer in Java?

Store the data into ByteBuffer using various put() method e.g. putInt(), putLong(). Flip the Buffer so that Channel can read data from the buffer and write it into a file. The flip() method changes the pointers and allows you to read data from the buffer. Call the write() method of FileChannel.

How do I read ByteBuffer?

ByteBuffer is one of the very useful classes in java. nio package which is used to read data from channels and write data into channels directly. Same ByteBuffer can be used to read and write data. If you want to read from ByteBuffer just call the flip() method and it will convert ByteBuffer into reading mode.

How do I read a NIO file?

Java NIO Read File Example

  1. FileChannel and ByteBuffer to read small files. Use this technique to read a small file where all the file content is fits into the buffer, and the file can be read in a single operation.
  2. FileChannel and ByteBuffer to read large files.
  3. Read a file using MappedByteBuffer.

Which is used to read data from ByteBuffer?

The get(int index) method of ByteBuffer is used to read the article at a specified index. Parameters: This method takes index (The index from which the Byte will be read) as a parameter. Return Value: This method returns the Byte value at the given index.

How do I make ByteBuffer?

A ByteBuffer is created via the the two static factory methods:

  1. allocate(int) this will allocate a HeapByteBuffer with the capacity specified by the int argument.
  2. allocateDirect(int) this will allocate a DirectByteBuffer with the capacity specified by the int argument.

How do I convert ByteBuffer?

There are three ways to convert a ByteBuffer to String:

  1. creating a new String from bytebuffer. array()
  2. creating a new String from bytebuffer. get(bytes)
  3. using charset. decode()

How can we open and read a text file in Java?

There are several ways to read a plain text file in Java e.g. you can use FileReader, BufferedReader, or Scanner to read a text file….Methods:

  1. Using BufferedReader class.
  2. Using Scanner class.
  3. Using File Reader class.
  4. Reading the whole file in a List.
  5. Read a text file as String.

What is ByteBuffer in Java?

A ByteBuffer is a buffer which provides for transferring bytes from a source to a destination. In addition to storage like a buffer array, it also provides abstractions such as current position, limit, capacity, etc. A FileChannel is used for transferring data to and from a file to a ByteBuffer.