DoubleBuffer asReadOnlyBuffer() method in Java with Examples

The java.nio.DoubleBuffer has an asReadOnlyBuffer() function. With the contents of this buffer, a new, read-only double buffer is created using the DoubleBuffer Class. The buffer is a duplicate of the new buffer. Therefore, any modifications made to the contents of this buffer will be included in the new buffer.

Any changes made to the content of the new buffer will not be permitted as it is read-only. The position, limit, and mark values of the two buffers will not depend on one another. The capacity, limit, location, and mark values of the new buffer will be the same as those of the current buffer. The technique works identically to the duplicate method if this buffer is read-only.

Syntax:

Return Value: The new read-only double buffer with the identical contents as this buffer is returned by this method.

Example 1:

The code basically creates a DoubleBuffer with a five capacity, then loads it with five double values. In order to enable reading from the beginning, the buffer is then rewound to reset its position to zero. With the asReadOnlyBuffer() function, a read-only copy of the buffer is produced. The contents of this read-only buffer are identical, yet it is immutable. Both the original and read-only buffers' contents are printed. The code handles exceptions for ReadOnlyBufferException and IllegalArgumentException.

Implementation:

FileName: BufferReadOnlyExample1.java

Output:

 The Original DoubleBuffer is given by : [9.63, 8.36, 7.54, 6.53, 5.87] The ReadOnlyBuffer DoubleBuffer is given by : 9.63 8.36 7.54 6.53 5.87 

Example 2:

The Java ReadOnlyBuffer's functionality is illustrated by the code. The asReadOnlyBuffer() function is used to create a read-only duplicate of the buffer after it has been rewound to its original location. Next, the contents of this read-only buffer are displayed on the screen. Since the read-only buffer is immutable, the attempt to add a new value to it by the code raises a ReadOnlyBufferException. The catch block handles and catches this exception.

Implementation:

FileName: BufferReadOnlyExample2.java

Output:

 The Original DoubleBuffer is given by : [9.63, 8.36, 7.54, 6.53, 5.87] The ReadOnlyBuffer DoubleBuffer is given by : 9.63 8.36 7.54 6.53 5.87 ReadOnlyBufferException is caught: java.nio.ReadOnlyBufferException