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:
Java
Java
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 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:
Examples 2: When the buffer is not backed by an array
IntBuffer ib is backed by array
// 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
