What is the floatBuffer hasArray() method in Java?

The java.nio.FloatBuffer is a class we can use to store a buffer of floats. The hasArray() method of this class checks if a buffer has an accessible float arrayarray for storing underlying values backing it. An accessible array is an array that is not read-only.

Declaration

The FloatBuffer.hasArray() method is declared as follows:

buff.hasArray()

buff: The FloatBuffer we will check to determine whether it has an accessible float array backing it.

Return value

The FloatBuffer.hasArray() method returns a boolean such that:

The return value is true if buff has an accessible float array backing it.
The return value is false if buff does not have an accessible float array backing it.

This means that FloatBuffer.hasArray() returns true only if buff has a float array backing it and that array is not read-only.

Code

Example 1

Consider the code snippet below, which demonstrates the FloatBuffer.hasArray() method when a backing array is present:

import java.nio.*;
import java.util.*;
public class main {
   public static void main(String[] args) {
      int n1 = 5;
      try {
         FloatBuffer buff1 = FloatBuffer.allocate(n1);
         buff1.put(1.5F);
         buff1.put(4.6F);
         System.out.println("buff1: " + Arrays.toString(buff1.array()));
         
         boolean foo = buff1.hasArray();
         System.out.println("\nbuff1 has an accessible array backing it: " + foo);
         
      } catch (IllegalArgumentException e) {
         System.out.println("Error!!! IllegalArgumentException");
      } catch (ReadOnlyBufferException e) {
         System.out.println("Error!!! ReadOnlyBufferException");
      }
   }
}

import java.nio.*;
import java.util.*;
public class main {
   public static void main(String[] args) {
      int n1 = 5;
      try {
         FloatBuffer buff1 = FloatBuffer.allocate(n1);
         buff1.put(1.5F);
         buff1.put(4.6F);
         System.out.println("buff1: " + Arrays.toString(buff1.array()));
         
         FloatBuffer buff2 = buff1.asReadOnlyBuffer();
         
         boolean foo1 = buff1.hasArray();
         System.out.println("\nbuff1 has an accessible array backing it: " + foo1);
         boolean foo2 = buff2.hasArray();
         System.out.println("buff2 has an accessible array backing it: " + foo2);
         
      } catch (IllegalArgumentException e) {
         System.out.println("Error!!! IllegalArgumentException");
      } catch (ReadOnlyBufferException e) {
         System.out.println("Error!!! ReadOnlyBufferException");
      }
   }
}

Explanation

A FloatBuffer buff1 is declared in line 7 with capacity n1 = 5.
Two elements are added to buff1 using the put() method in line 8-9.
A FloatBuffer buff2 is declared in line 12 which is the read-only copy of buff1.
The FloatBuffer.hasArray() method is used in line 14 to check if buff1 has an accessible float array backing it. The FloatBuffer.hasArray() method returns true.
The FloatBuffer.hasArray() method is used in line 16 to check if buff2 has an accessible float array backing it. The FloatBuffer.hasArray() method returns false. This is because buff2 is read-only.

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What is the floatBuffer hasArray() method in Java?

Declaration

Return value

Code

Example 1

Explanation

Example 2

Explanation