Question

What to use ByteBuffer hasArray() method to check if ByteBuffer has an accessible byte array in Java

Answer 1

import java.nio.ByteBuffer;

public class MyClass {
    public static void main(String args[]) {
        ByteBuffer buffer1 = ByteBuffer.allocate(6);
    
        byte values[] = {4, 7, 9, 0, 1, 7};
    
        for (int i = 0; i < 5; i++) {
            buffer1.put(values[i]);
        }
    
        if (buffer1.hasArray()) {
          System.out.println("Buffer1 has an accessible byte array");
        }
        else {
          System.out.println("Buffer1 does not have an accessible byte array");
        }
        
        ByteBuffer buffer2 = buffer1.asReadOnlyBuffer();
    
        if (buffer2.hasArray()) {
            System.out.println("Buffer2 has an accessible byte array");
        }
        else {
          System.out.println("Buffer2 does not have an accessible byte array");
        }
    }
}





/*
run:

Buffer1 has an accessible byte array
Buffer2 does not have an accessible byte array

*/

 

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