What is the difference between ByteBuffer and byte array?

The byte[] is just a primitive array, just containing the raw data. So, it does not have convenient methods for building or manipulating the content. A ByteBuffer is more like a builder. It creates a byte[] .

Is ByteBuffer thread safe?

Note that ByteBuffers are not safe for use by multiple concurrent threads. When a read or write operation is initiated then care must be taken to ensure that the buffer is not accessed until the operation completes.

What is ByteBuffer limit?

ByteBuffer limit() methods in Java with Examples The limit() method of java. nio. ByteBuffer Class is used to set this buffer’s limit. If the position is larger than the new limit then it is set to the new limit. If the mark is defined and larger than the new limit then it is discarded.

What is a ByteBuffer?

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.

What does ByteBuffer wrap do?

wrap. Wraps a byte array into a buffer. The new buffer will be backed by the given byte array; that is, modifications to the buffer will cause the array to be modified and vice versa. The new buffer’s capacity and limit will be array.

Is tree map thread-safe?

TreeMap and TreeSet are not thread-safe collections, so care must be taken to ensure when used in multi-threaded programs. Both TreeMap and TreeSet are safe when read, even concurrently, by multiple threads.

Is tree set thread-safe?

Although TreeSet isn’t thread-safe, it can be synchronized externally using the Collections.

How do I know my ByteBuffer size?

After you’ve written to the ByteBuffer, the number of bytes you’ve written can be found with the position() method. If you then flip() the buffer, the number of bytes in the buffer can be found with the limit() or remaining() methods.

What is ByteBuffer flip?

flip is used to flip the ByteBuffer from “reading from I/O” ( put ting) to “writing to I/O” ( get ting): after a sequence of put s is used to fill the ByteBuffer , flip will set the limit of the buffer to the current position and reset the position to zero.

Why HashMap is faster than TreeMap?

HashMap, being a hashtable-based implementation, internally uses an array-based data structure to organize its elements according to the hash function. HashMap provides expected constant-time performance O(1) for most operations like add(), remove() and contains(). Therefore, it’s significantly faster than a TreeMap.

Why is TreeMap faster?

It provides a performance of O(1) , while TreeMap provides a performance of O(log(n)) to add, search, and remove items. Hence, HashMap is usually faster. A TreeMap uses memory way more effective so it is a good Map implementation for you if you are not sure of elements quantity that have to be stored in memory.