FloatBuffer asReadOnlyBuffer() method in Java

A read-only float buffer can be created using the contents of a buffer with the method asReadOnlyBuffer() in the class java.nio.FloatBuffer. The new buffer cannot have any modifications as it is a read-only buffer. However, the capacity, positions, limits etc. of the new buffer are the same as the previous buffer.

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 {
         FloatBuffer buffer = FloatBuffer.allocate(5);
         buffer.put(4.5F);
         buffer.put(1.2F);
         buffer.put(3.9F);
         buffer.put(7.5F);
         buffer.put(5.8F);
         buffer.rewind();
         System.out.println("The Original FloatBuffer is: " + Arrays.toString(buffer.array()));
         FloatBuffer roBuffer = buffer.asReadOnlyBuffer();
         System.out.println("The ReadOnlyBuffer FloatBuffer is: ");
         while (roBuffer.hasRemaining())
         System.out.print(roBuffer.get() + " ");
      } 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 FloatBuffer is: [4.5, 1.2, 3.9, 7.5, 5.8]
The ReadOnlyBuffer FloatBuffer is:
4.5 1.2 3.9 7.5 5.8