Método CharBuffer slice() en Java

El método slice() de java.nio.charBuffer Class se usa para crear un nuevo búfer char cuyo contenido es una subsecuencia compartida del contenido del búfer dado. El contenido del nuevo búfer comenzará desde la posición actual de este búfer. El nuevo búfer mostrará los cambios realizados en el contenido del búfer y viceversa. Los valores de posición, límite y marca de los dos búferes serán independientes. La posición del nuevo búfer será cero, su capacidad y su límite serán el número de enteros restantes en este búfer, y su marca será indefinida. Si, y solo si, este búfer es directo, entonces el nuevo búfer será directo y será de solo lectura si, y solo si, este búfer es de solo lectura.

 Sintaxis:

public abstract CharBuffer slice()

Valor devuelto: este método devuelve el nuevo búfer de caracteres. 

A continuación se muestran los ejemplos para ilustrar el método slice(): 

Ejemplo 1: 

// Java program to demonstrate
// slice() method
import java.nio.*;
import java.util.*;
 
public class GFG {
 
    public static void main(String[] args)
    {
 
        // Declaring the capacity of the CharBuffer
        int capacity = 10;
 
        // Creating the CharBuffer
        try {
 
            // creating object of Charbuffer
            // and allocating size capacity
            CharBuffer cb1 = CharBuffer.allocate(capacity);
 
            // putting the value in intbuffer
            cb1.put('a');
            cb1.put('b');
 
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb1.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb1.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb1.capacity());
 
            // Creating a shared subsequence buffer of given CharBuffer
            // using slice() method
            CharBuffer cb2 = cb1.slice();
 
            // print the shared subsequence buffer
            System.out.println("shared subsequence CharBuffer: "
                               + Arrays.toString(cb2.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb2.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb2.capacity());
        }
 
        catch (IllegalArgumentException e) {
 
            System.out.println("IllegalArgumentException catched");
        }
 
        catch (ReadOnlyBufferException e) {
 
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

Original CharBuffer: [a, b, , , , , , , , ]
position: 2
capacity: 10
shared subsequance CharBuffer: [a, b, , , , , , , , ]
position: 0
capacity: 8

Ejemplo 2: 

// Java program to demonstrate
// slice() method
 
import java.nio.*;
import java.util.*;
 
public class GFG {
 
    public static void main(String[] args)
    {
 
        // Declaring the capacity of the CharBuffer
        int capacity = 10;
 
        // Creating the CharBuffer
        try {
 
            // creating object of charbuffer
            // and allocating size capacity
            CharBuffer cb1 = CharBuffer.allocate(capacity);
 
            // putting the value in floatbuffer
            cb1.put('a');
            cb1.put('b');
            cb1.put('c');
            cb1.put('d');
 
            // print the CharBuffer
            System.out.println("Original CharBuffer: "
                               + Arrays.toString(cb1.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb1.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb1.capacity());
 
            // Creating a shared subsequence buffer of given CharBuffer
            // using slice() method
            CharBuffer cb2 = cb1.slice();
            cb2.put('k');
            cb2.put('l');
 
            // print the shared subsequence buffer
            System.out.println("shared subsequence CharBuffer: "
                               + Arrays.toString(cb2.array()));
 
            // print the CharBuffer position
            System.out.println("position: " + cb2.position());
 
            // print the CharBuffer capacity
            System.out.println("capacity: " + cb2.capacity());
        }
 
        catch (IllegalArgumentException e) {
 
            System.out.println("IllegalArgumentException catched");
        }
 
        catch (ReadOnlyBufferException e) {
 
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

Original CharBuffer: [a, b, c, d, , , , , , ]
position: 4
capacity: 10
shared subsequance CharBuffer: [a, b, c, d, k, l, , , , ]
position: 2
capacity: 6