El método rewind() de java.nio.CharBuffer Class se utiliza para rebobinar este búfer. La posición se pone a cero y la marca se descarta. Invoque este método antes de una secuencia de operaciones de obtención o escritura de canal, suponiendo que el límite ya se haya establecido correctamente. Invocar este método no cambia ni descarta el valor de la marca.
Sintaxis:
public ByteBuffer rewind()
Valor devuelto: este método devuelve este búfer.
A continuación se muestran los ejemplos para ilustrar el método rewind():
Ejemplos 1:
// Java program to demonstrate
// rewind() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// defining and allocating CharBuffer
// using allocate() method
CharBuffer charBuffer = CharBuffer.allocate(4);
// put char value in charBuffer
// using put() method
charBuffer.put('a');
charBuffer.put((char)105);
// print the char buffer
System.out.println("Buffer before operation: "
+ Arrays.toString(
charBuffer.array())
+ "\nPosition: "
+ charBuffer.position()
+ "\nLimit: "
+ charBuffer.limit());
// rewind the Buffer
// using rewind() method
charBuffer.rewind();
// print the charbuffer
System.out.println("\nBuffer after operation: "
+ Arrays.toString(
charBuffer.array())
+ "\nPosition: "
+ charBuffer.position()
+ "\nLimit: "
+ charBuffer.limit());
}
}
Buffer before operation: [a, i,, ] Position: 2 Limit: 4 Buffer after operation: [a, i,, ] Position: 0 Limit: 4
Ejemplos 2:
// Java program to demonstrate
// rewind() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// defining and allocating CharBuffer
// using allocate() method
CharBuffer charBuffer
= CharBuffer.allocate(5);
// put byte value in charBuffer
// using put() method
charBuffer.put('a');
charBuffer.put('b');
charBuffer.put('c');
// mark will be going to discarded by rewind()
charBuffer.mark();
// print the buffer
System.out.println("Buffer before operation: "
+ Arrays.toString(
charBuffer.array())
+ "\nPosition: "
+ charBuffer.position()
+ "\nLimit: "
+ charBuffer.limit());
// Rewind the Buffer
// using rewind() method
charBuffer.rewind();
// print the buffer
System.out.println("\nBuffer after operation: "
+ Arrays.toString(
charBuffer.array())
+ "\nPosition: "
+ charBuffer.position()
+ "\nLimit: "
+ charBuffer.limit());
}
}
Buffer before operation: [a, b, c,, ] Position: 3 Limit: 5 Buffer after operation: [a, b, c,, ] Position: 0 Limit: 5
Referencia: https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#rewind–
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Artículo escrito por RohitPrasad3 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA