FloatBuffer arrayOffset() method in Java With Examples
Last Updated :
06 Dec, 2018
The
arrayOffset() method of
java.nio.FloatBuffer class is used to return the offset within the buffer's backing array of the first element of the buffer. It means that if this buffer is backed by an array, then buffer position p corresponds to array index p + arrayOffset().
Inorder to check whether this buffer has a backing array,
hasArray() method can be used. It ensures that this buffer has an accessible backing array.
Syntax :
public final int arrayOffset()
Return Value: This method returns the
offset within this buffer's array of the first element of the buffer.
Exception: This method throws
ReadOnlyBufferException if this buffer is backed by an array but is read-only
Below program illustrates the
arrayOffset() method.
Examples 1:
Java
// Java program to demonstrate
// arrayOffset() 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);
// print the FloatBuffer
System.out.println("FloatBuffer: "
+ Arrays.toString(fb.array()));
// print the arrayOffset
System.out.println("arrayOffset: "
+ fb.arrayOffset());
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws" + e);
}
}
}
Output:
FloatBuffer: [8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
arrayOffset: 0
Examples 2: To demonstrate ReadOnlyBufferException
Java
// Java program to demonstrate
// arrayOffset() 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();
// Creating a read-only copy of FloatBuffer
// using asReadOnlyBuffer() method
FloatBuffer fb1 = fb.asReadOnlyBuffer();
// print the FloatBuffer
System.out.print("Read only buffer : ");
while (fb1.hasRemaining())
System.out.print(fb1.get() + ", ");
// next line
System.out.println("");
// print the arrayOffset
System.out.println("\nTry to print the array offset"
+ " of read only buffer");
System.out.println("arrayOffset: " + fb1.arrayOffset());
}
catch (IllegalArgumentException e) {
System.out.println("Exception throws: " + e);
}
catch (ReadOnlyBufferException e) {
System.out.println("Exception throws: " + e);
}
}
}
Output:
Read only buffer : 8.56, 0.0, 9.61, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
Try to print the array offset of read only buffer
Exception throws: java.nio.ReadOnlyBufferException
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