CharBuffer array() method in Java

The array() method of java.nio.CharBuffer Class is used to return the char array that backs this buffer. Any modifications done to this buffer’s content will cause the returned array’s content also to be modified, and vice versa. hasArray() method is invoked before invoking this method in order to ensure that this buffer has an accessible backing array.

Syntax:

public final char[] array()

Return Value: This method returns the array that backs this buffer.



Throws: This method throws the ReadOnlyBufferException(If this buffer is backed by an array but is read-only)

Below program illustrates the array() method:

Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate
// array() 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 cb = CharBuffer.allocate(capacity);
  
            // putting the value in CharBuffer
            cb.put('a');
            cb.put(2, 'b');
            cb.rewind();
  
            // getting array from cb
            // CharBuffer using array() method
            char[] cbb = cb.array();
  
            // printing the CharBuffer cb
            System.out.println("CharBuffer: "
                               + Arrays.toString(cbb));
        }
  
        catch (IllegalArgumentException e) {
  
            System.out.println("IllegalArgumentException catched");
        }
  
        catch (ReadOnlyBufferException e) {
  
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}

chevron_right






                        filter_none









Output:


CharBuffer: [a, , b, , , , , , , ]





Example 2:











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// Java program to demonstrate 


// array() method 


  


import java.nio.*; 


import java.util.*; 


  


public class GFG { 


    public static void main(String[] args) 


    { 


  


        // Declaring the capacity of the cb 


        int capacity1 = 10; 


  


        // Declaring the capacity of the cb1 


        int capacity2 = 5; 


  


        // Creating the CharBuffer 


        try { 


            // 


            // cb 


            // 


            // creating object of CharBuffer cb 


            // and allocating size capacity 


            CharBuffer cb = CharBuffer.allocate(capacity1); 


  


            // putting the value in cb 


            cb.put('a'); 


            cb.put(2, 'b'); 


            cb.put(3, 'c'); 


            cb.rewind(); 


  


            // print the CharBuffer 


            System.out.println("CharBuffer cb: "


                               + Arrays.toString(cb.array())); 


  


            // 


            // cb1 


            // 


            // creating object of CharBuffer cb1 


            // and allocating size capacity 


            CharBuffer cb1 = CharBuffer.allocate(capacity2); 


  


            // putting the value in cb1 


            cb1.put(1, 'd'); 


            cb1.put(2, 'e'); 


            cb1.rewind(); 


  


            // print the CharBuffer 


            System.out.println("\nCharBuffer cb1: "


                               + Arrays.toString(cb1.array())); 


  


            // Creating a read-only copy of CharBuffer 


            // using asReadOnlyBuffer() method 


            CharBuffer readOnlycb = cb.asReadOnlyBuffer(); 


  


            // print the CharBuffer 


            System.out.print("\nReadOnlyBuffer CharBuffer: "); 


  


            while (readOnlycb.hasRemaining()) 


                System.out.print(readOnlycb.get() + ", "); 


  


            // try to change readOnlycb 


            System.out.println("\n\nTrying to get the array"


                               + " from ReadOnlycb for editing"); 


  


            char[] cbarr = readOnlycb.array(); 


        } 


        catch (IllegalArgumentException e) { 


            System.out.println("IllegalArgumentException catched"); 


        } 


        catch (ReadOnlyBufferException e) { 


            System.out.println("Exception thrown: " + e); 


        } 


    } 


} 



















                        chevron_right







                        filter_none









Output:


CharBuffer cb: [a,, b, c,,,,,, ]

CharBuffer cb1: [, d, e,, ]

ReadOnlyBuffer CharBuffer: a,, b, c,,,,,,, 

Trying to get the array from ReadOnlycb for editing
Exception thrown: java.nio.ReadOnlyBufferException






          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
Image
gopaldave
The function of education is to teach one to think intensively and to think critically
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.