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–