El método isReadOnly() de la clase java.nio.Buffer se usa para saber si este búfer es de solo lectura o no.
Sintaxis:
public abstract boolean isReadOnly()
Devoluciones: este método devolverá verdadero si, y solo si, este búfer es de solo lectura.
A continuación se muestran los ejemplos para ilustrar el método isReadOnly() :
Ejemplos 1:
// Java program to demonstrate
// isReadOnly() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 10;
// creating object of bytebuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in bytebuffer
bb.put((byte)10);
bb.put((byte)20);
bb.rewind();
// Typecast bytebuffer to Buffer
Buffer buffer = (Buffer)bb;
// checking buffer is backed by array or not
boolean isReadOnly = buffer.isReadOnly();
// checking if else condition
if (isReadOnly)
System.out.println("buffer is"
+ " ReadOnly buffer");
else
System.out.println("buffer is not"
+ " ReadOnly buffer");
}
}
Producción:
buffer is not ReadOnly buffer
Ejemplos 2:
// Java program to demonstrate
// isReadOnly() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 10;
// creating object of bytebuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in bytebuffer
bb.put((byte)10);
bb.put((byte)20);
bb.rewind();
// Creating a read-only copy of ByteBuffer
// using asReadOnlyBuffer() method
ByteBuffer bb1 = bb.asReadOnlyBuffer();
// Typecast read-only ByteBuffer to read-only buffer
Buffer buffer = (Buffer)bb1;
// checking buffer is backed by array or not
boolean isReadOnly = buffer.isReadOnly();
// checking if else condition
if (isReadOnly)
System.out.println("buffer is"
+ " ReadOnly buffer");
else
System.out.println("buffer is not"
+ " ReadOnly buffer");
}
}
Producción:
buffer is ReadOnly buffer
Referencia: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#isReadOnly–
Publicación traducida automáticamente
Artículo escrito por RohitPrasad3 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA