DoubleBuffer clear() methods in Java with Examples
The clear() method of java.nio.CharBuffer Class is used to clear this buffer. While clearing this buffer following changes are done:
- the position is set to zero
- the limit is set to the capacity
- the mark is discarded.
Syntax:
public final DoubleBuffer clear()
Return Value: This method returns this DoubleBuffer instance after clearing all the data from it.
Below are the examples to illustrate the clear() method:
Examples 1:
// Java program to demonstrate// clear() method import java.nio.*;import java.util.*; public class GFG { public static void main(String[] args) { try { double[] darr = { 2.5, 3.5, 4.5, 6.7 }; // creating object of DoubleBuffer // and allocating size capacity DoubleBuffer db = DoubleBuffer.wrap(darr); // try to set the position at index 2 db.position(2); // Set this buffer mark position // using mark() method db.mark(); // try to set the position at index 4 db.position(4); // display position System.out.println("position before reset: " + db.position()); // try to call clear() to restore // to the position at index 0 // by discarding the mark db.clear(); // display position System.out.println("position after reset: " + db.position()); } catch (InvalidMarkException e) { System.out.println("new position is less than " + "the position we " + "marked before "); System.out.println("Exception throws: " + e); } }} |
Output:
position before reset: 4 position after reset: 0
Examples 2:
// Java program to demonstrate// clear() method import java.nio.*;import java.util.*; public class GFG { public static void main(String[] args) { double[] carr = { 2.4, 105.4, 13.9, 23.45d }; // creating object of DoubleBuffer // and allocating size capacity DoubleBuffer db = DoubleBuffer.wrap(carr); // try to set the position at index 3 db.position(3); // display position System.out.println("position before clear: " + db.position()); // try to call clear() to restore // to the position at index 0 // by discarding the mark db.clear(); // display position System.out.println("position after clear: " + db.position()); }} |
Output:
position before clear: 3 position after clear: 0
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/DoubleBuffer.html#clear–
