FloatBuffer asReadOnlyBuffer() method in Java with Examples
Last Updated :
06 Dec, 2018
The
asReadOnlyBuffer() method of
java.nio.FloatBuffer Class is used to create a
new, read-only float buffer with this buffer's content. The new buffer is a replica of this buffer. Hence changes made to this buffer's content will be visible in the new buffer.
Since the new buffer is read-only, therefore any modification to its content won't be allowed. The two buffers' position, limit, and mark values will be independent. The new buffer's capacity, limit, position, and mark values will be identical to those of this buffer. If this buffer is itself read-only then this method behaves in exactly the same way as the duplicate method.
Syntax :
public abstract FloatBuffer asReadOnlyBuffer()
Return Value: This method returns the
new, read-only float buffer with the same content as that of this buffer.
Below are the examples to illustrate the asReadOnlyBuffer() method:
Examples 1:
Java
// Java program to demonstrate
// asReadOnlyBuffer() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the FloatBuffer
int capacity = 10;
// Creating the FloatBuffer
try {
// creating object of floatbuffer
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity);
// putting the value in floatbuffer
fb.put(8.56F);
fb.put(2, 9.61F);
fb.rewind();
// print the FloatBuffer
System.out.println("Original FloatBuffer: "
+ Arrays.toString(fb.array()));
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer floatBuffer = fb.asReadOnlyBuffer();
// print the FloatBuffer
System.out.print("\nReadOnlyBuffer FloatBuffer: ");
while (floatBuffer.hasRemaining())
System.out.print(floatBuffer.get() + ", ");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
Output:
Original FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
ReadOnlyBuffer FloatBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Examples 2:
Java
// Java program to demonstrate
// asReadOnlyBuffer() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args) throws Exception
{
// Declaring the capacity of the fb
int capacity1 = 10;
// Declaring the capacity of the fb1
int capacity2 = 5;
// Creating the FloatBuffer
try {
//
// fb
//
// creating object of floatbuffer fb
// and allocating size capacity
FloatBuffer fb = FloatBuffer.allocate(capacity1);
// putting the value in fb
fb.put(8.56F);
fb.put(2, 9.61F);
fb.rewind();
// print the FloatBuffer
System.out.println("FloatBuffer fb: "
+ Arrays.toString(fb.array()));
//
// fb1
//
// creating object of floatbuffer fb1
// and allocating size capacity
FloatBuffer fb1 = FloatBuffer.allocate(capacity2);
// putting the value in fb1
fb1.put(1, 4.56F);
fb1.put(2, 6.45F);
fb1.rewind();
// print the FloatBuffer
System.out.println("\nFloatBuffer fb1: "
+ Arrays.toString(fb1.array()));
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer readOnlyFb = fb.asReadOnlyBuffer();
// print the FloatBuffer
System.out.print("\nReadOnlyBuffer FloatBuffer: ");
while (readOnlyFb.hasRemaining())
System.out.print(readOnlyFb.get() + ", ");
// try to change readOnlyFb
System.out.println("\n\nTrying to get the array"
+ " from ReadOnlyFb for editing");
float[] fbarr = readOnlyFb.array();
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception thrown: " + e);
}
}
}
Output:
FloatBuffer fb: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
FloatBuffer fb1: [0.0, 4.56, 6.45, 0.0, 0.0]
ReadOnlyBuffer FloatBuffer: 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Trying to get the array from ReadOnlyFb for editing
Exception thrown: java.nio.ReadOnlyBufferException
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