Use ByteBuffer to store Strings

Ilias TsagklisNovember 11th, 2012Last Updated: March 19th, 2019

0 489 1 minute read

This is an example of how to store Strings using a ByteBuffer in Java. In order to use a ByteBuffer to store Strings in Java we have to :

Allocate a newByteBuffer and set its size to a number large enough in order to avoid buffer to overflow when putting bytes to it
Use theasCharBuffer() API method so as to be able to put characters directly into the byte buffer
Using theput(String) API method we can put a String directly to the byte buffer
ThetoString() API method returns the string representation of the ByteBuffer’s contents. Do not forget toflip() the ByteBuffer since thetoString() API method displays ByteBuffer’s contents from the current buffer’s position on-wards

as shown in the code snippet below.

package com.javacodegeeks.snippets.core;import java.nio.ByteBuffer;import java.nio.CharBuffer;public class UseByteBufferToStoreStrings {public static void main(String[] args) {// Allocate a new non-direct byte buffer with a 50 byte capacity    // set this to a big value to avoid BufferOverflowExceptionByteBuffer buf = ByteBuffer.allocate(50); // Creates a view of this byte buffer as a char bufferCharBuffer cbuf = buf.asCharBuffer();// Write a string to char buffercbuf.put("Java Code Geeks");// Flips this buffer.  The limit is set to the current position and then// the position is set to zero.  If the mark is defined then it is discardedcbuf.flip();String s = cbuf.toString();  // a stringSystem.out.println(s);}}

Output:

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