Buffer hasArray() methods in Java with Examples
The hasArray() method of java.nio.Buffer class is used to tell whether or not this buffer is backed by an accessible array. If this method returns true then the array and arrayOffset() methods may safely be invoked. Syntax:
public abstract boolean hasArray()
Returns: 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
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
int capacity = 10 ;
try {
ByteBuffer bb = ByteBuffer.allocate(capacity);
bb.put(( byte ) 10 );
bb.put(( byte ) 20 );
bb.rewind();
Buffer buffer = (Buffer)bb;
boolean isArray = buffer.hasArray();
if (isArray)
System.out.println("buffer is"
+ " backed by array");
else
System.out.println("buffer is"
+ " not backed by any array");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
|
Output:
buffer is backed by array
Examples 2: When the buffer is not backed by an array
Java
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
int capacity = 10 ;
try {
ByteBuffer bb = ByteBuffer.allocate(capacity);
bb.put(( byte ) 8 .56F);
bb.put(( byte ) 10 );
bb.rewind();
ByteBuffer bb1 = bb.asReadOnlyBuffer();
Buffer buffer = (Buffer)bb1;
boolean isArray = buffer.hasArray();
if (isArray)
System.out.println("buffer is"
+ " backed by array");
else
System.out.println("buffer is"
+ " not backed by any array");
}
catch (IllegalArgumentException e) {
System.out.println("IllegalArgumentException catched");
}
catch (ReadOnlyBufferException e) {
System.out.println("ReadOnlyBufferException catched");
}
}
}
|
Output:
buffer is not backed by any array
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#hasArray–
Last Updated :
19 Jan, 2023
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