DoubleBuffer compact() method in Java



The buffer can be compacted using the compact() method in the class java.nio.DoubleBuffer. This method does not require a parameter and it returns the new compacted DoubleBuffer with the same content as the original buffer. If the buffer is read-only, then the ReadOnlyBufferException is thrown.

A program that demonstrates this is given as follows −

Example

 Live Demo

import java.nio.*;
import java.util.*;
public class Demo {
   public static void main(String[] args) {
      int n = 5;
      try {
         DoubleBuffer buffer = DoubleBuffer.allocate(n);
         buffer.put(1.2D);
         buffer.put(3.9D);
         buffer.put(7.5D);
         System.out.println("The Original DoubleBuffer is: " + Arrays.toString(buffer.array()));
         System.out.println("The position is: " + buffer.position());
         System.out.println("The limit is: " + buffer.limit());
         DoubleBuffer bufferCompact = buffer.compact();
         System.out.println("
The Compacted DoubleBuffer is: " + Arrays.toString(bufferCompact.array()));          System.out.println("The position is: " + bufferCompact.position());          System.out.println("The limit is: " + bufferCompact.limit());       } catch (IllegalArgumentException e) {          System.out.println("Error!!! IllegalArgumentException");       } catch (ReadOnlyBufferException e) {          System.out.println("Error!!! ReadOnlyBufferException");       }    } }

The output of the above program is as follows −

Output

The Original DoubleBuffer is: [1.2, 3.9, 7.5, 0.0, 0.0]
The position is: 3
The limit is: 5

The Compacted DoubleBuffer is: [0.0, 0.0, 7.5, 0.0, 0.0]
The position is: 2
The limit is: 5
Samual Sam
Samual Sam

Learning faster. Every day.


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