DoubleBuffer clear() methods in Java with Examples
Last Updated :
29 Jul, 2019
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The clear() method of java.nio.CharBuffer Class is used to clear this buffer. While clearing this buffer following changes are done:
Java
Java
- the position is set to zero
- the limit is set to the capacity
- the mark is discarded.
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:
Examples 2:
position before reset: 4 position after reset: 0
// 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:
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/DoubleBuffer.html#clear--
position before clear: 3 position after clear: 0