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How to overwrite a specific chunk in a byte array using java?
Java provides a ByteBuffer class which allows you to wrap an array into a byte buffer using its wrap() method. Once you did that you can replace the contents of the buffer using the position(): To select the starting position and, put(): To replace the data methods:
Example
import java.nio.ByteBuffer; public class OverwriteChunkOfByteArray { public static void main(String args[]) { String str = "Hello how are you what are you doing"; byte[] byteArray = str.getBytes(); System.out.println("Contents of the byet array :: "); for(int i = 0; i<byteArray.length; i++) { System.out.println((char)byteArray[i]); } ByteBuffer buffer = ByteBuffer.wrap(byteArray); byte[] newArray = "where do you live ".getBytes(); buffer.position(18); buffer.put(newArray); System.out.println("Contents of the byte array after replacement::"); for(int i = 0; i<byteArray.length; i++) { System.out.println((char)byteArray[i]); } } }
Output
of the byte array :: H e l l o h o w a r e y o u w h a t a r e y o u d o i n g Contents of the byet array after replacement :: H e l l o h o w a r e y o u w h e r e d o y o u l i v e
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