IntBuffer hasArray() method in Java

Last Updated : 19 Sep, 2018
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The hasArray() method of java.nio.IntBuffer class is used to ensure whether or not the given buffer is backed by an accessible int array. It returns true if there is an accessible backing array to this buffer, else it returns false. If this method returns true, then the array() and arrayOffset() methods may safely be invoked, as they work on the backing array. Syntax: 
public final boolean hasArray()
Return Value: This method will return true if, and only if, this buffer is backed by an array and is not read-only. Else it returns false. Below are the examples to illustrate the hasArray() method: Examples 1: When the buffer is backed by an array Java 
// Java program to demonstrate
// hasArray() method

import java.nio.*;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // Declaring the capacity of the IntBuffer
        int capacity = 10;

        // Creating the IntBuffer
        try {

            // creating object of Intbuffer
            // and allocating size capacity
            IntBuffer ib = IntBuffer.allocate(capacity);

            // putting the value in Intbuffer
            ib.put(4);
            ib.put(2, 9);
            ib.rewind();

            // checking IntBuffer ib is backed by array or not
            boolean isArray = ib.hasArray();

            // checking if else condition
            if (isArray)
                System.out.println("IntBuffer ib is"
                                   + " backed by array");
            else
                System.out.println("IntBuffer ib is"
                                   + " not backed by any array");
        }

        catch (IllegalArgumentException e) {
            System.out.println("IllegalArgumentException catched");
        }

        catch (ReadOnlyBufferException e) {
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}
Output: 
IntBuffer ib is backed by array
Examples 2: When the buffer is not backed by an array Java 
// Java program to demonstrate
// hasArray() method

import java.nio.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the capacity of the IntBuffer
        int capacity = 10;

        // Creating the IntBuffer
        try {

            // creating object of Intbuffer
            // and allocating size capacity
            IntBuffer ib = IntBuffer.allocate(capacity);

            // putting the value in Intbuffer
            ib.put(8);
            ib.put(2, 9);
            ib.rewind();

            // Creating a read-only copy of IntBuffer
            // using asReadOnlyBuffer() method
            IntBuffer ib1 = ib.asReadOnlyBuffer();

            // checking IntBuffer ib is backed by array or not
            boolean isArray = ib1.hasArray();

            // checking if else condition
            if (isArray)
                System.out.println("IntBuffer ib is"
                                   + " backed by array");
            else
                System.out.println("IntBuffer ib is"
                                   + " not backed by any array");
        }

        catch (IllegalArgumentException e) {
            System.out.println("IllegalArgumentException catched");
        }

        catch (ReadOnlyBufferException e) {
            System.out.println("ReadOnlyBufferException catched");
        }
    }
}
Output: 
IntBuffer ib is not backed by any array

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