What is the floatBuffer rewind() method in Java?
java.nio.FloatBuffer is a class we can use to store a buffer of floats.
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 FloatBuffer.rewind() method is declared as follows:
buff.rewind()
buff: TheFloatBufferto rewind.
Return value
The FloatBuffer.rewind() method returns the FloatBuffer buff after rewinding.
Code
Consider the code snippet below, which demonstrates the use of the FloatBuffer.rewind() method.
import java.nio.*;import java.util.*;public class main {public static void main(String[] args) {int n1 = 4;int n2 = 4;try {FloatBuffer buff1 = FloatBuffer.allocate(n1);buff1.put(1.5F);buff1.put(4.6F);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(1.9F);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
FloatBufferbuff1is 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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