CharBuffer slice() method in Java

Last Updated : 16 Nov, 2022

slice() method of java.nio.charBuffer Class is used to create a new char buffer whose content is a shared subsequence of the given buffer's content. The content of the new buffer will start from this buffer's current position. The new buffer will show the changes made in the buffer's content, and vice-versa. The two buffers' position, limit, and mark values will be independent. The new buffer's position will be zero, its capacity and its limit will be the number of integers remaining in this buffer, and its mark will be undefined. If, and only if, this buffer is direct then the new buffer will be direct and it will be read-only if, and only if, this buffer is read-only.

 Syntax:

public abstract CharBuffer slice()

Return Value: This method returns the new char buffer. 

Below are the examples to illustrate the slice() method: 

Example 1: 

Java 
// 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");
        }
    }
}
Output:
Original CharBuffer: [a, b, , , , , , , , ]
position: 2
capacity: 10
shared subsequence CharBuffer: [a, b, , , , , , , , ]
position: 0
capacity: 8

Example 2: 

Java 
// 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");
        }
    }
}
Output:
Original CharBuffer: [a, b, c, d, , , , , , ]
position: 4
capacity: 10
shared subsequence CharBuffer: [a, b, c, d, k, l, , , , ]
position: 2
capacity: 6
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