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ByteBuffer allocateDirect() method in Java
A direct byte buffer can be allocated using the method allocateDirect() in the class java.nio.ByteBuffer. This method requires a single parameter i.e. the capacity in bytes and it returns the direct byte buffer. If the capacity provided is negative, then the IllegalArgumentException is thrown.
A program that demonstrates this is given as follows −
Example
import java.nio.*;
import java.util.*;
public class Demo {
public static void main(String[] args) {
int n = 5;
try {
ByteBuffer buffer = ByteBuffer.allocateDirect(n);
byte[] byteValues = { 7, 1, 6, 3, 8 };
buffer = ByteBuffer.wrap(byteValues);
System.out.println("The direct ByteBuffer is: " + Arrays.toString(buffer.array()));
System.out.println("
The state of the ByteBuffer is: ");
System.out.println(buffer.toString());
} catch (IllegalArgumentException e) {
System.out.println("Error!!! IllegalArgumentException");
} catch (ReadOnlyBufferException e) {
System.out.println("Error!!! ReadOnlyBufferException");
}
}
}Output
The direct ByteBuffer is: [7, 1, 6, 3, 8] The state of the ByteBuffer is: java.nio.HeapByteBuffer[pos=0 lim=5 cap=5]
Updated on: 30-Jul-2019
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