What is the ShortBuffer rewind() method in Java?
java.nio.ShortBuffer is a class we can use to store a buffer of shorts. We can use this class’s rewind() method to rewind a buffer. Rewinding a buffer sets the buffer position to zero.
- Limit of the buffer remains unaffected.
- Any position previously marked is discarded.
Declaration
The ShortBuffer.rewind() method is declared as follows:
buff.rewind()
buff: TheShortBufferto rewind.
Return value
The ShortBuffer.rewind() method returns the ShortBuffer buff after rewinding.
Code
Consider the code snippet below, which demonstrates the use of the ShortBuffer.rewind() method.
import java.nio.*;import java.util.*;public class main {public static void main(String[] args) {int n1 = 4;int n2 = 4;try {ShortBuffer buff1 = ShortBuffer.allocate(n1);buff1.put((short)1);buff1.put((short)4);System.out.println("buff1: " + Arrays.toString(buff1.array()));System.out.println("position at(before rewind): " + buff1.position());System.out.println("rewind()");buff1.rewind();System.out.println("position at(after rewind): " + buff1.position());buff1.put((short)3);System.out.println("buff1: " + Arrays.toString(buff1.array()));} catch (IllegalArgumentException e) {System.out.println("Error!!! IllegalArgumentException");} catch (ReadOnlyBufferException e) {System.out.println("Error!!! ReadOnlyBufferException");}}}
Explanation
- A
ShortBufferbuff1is declared in line 8. - Two elements are added to
buff1using theput()method in lines 9-10. After adding the first element, the position ofbuff1is incremented from 0 to 1. After adding the second element, the position ofbuff1is incremented from 1 to 2. - The position of buff1 before rewind is 2. After calling the
rewind()method in line 16, the position ofbuff1is set to 0. This is why calling theput()method onbuff1adds the element at the 0th index ofbuff1.
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