DoubleBuffer mark() methods in Java with Examples
Last Updated :
29 Jul, 2019
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The mark() method of java.nio.DoubleBuffer Class is used to mark the current position of this DoubleBuffer as the mark of this buffer.
Syntax:
Java
Java
public DoubleBuffer mark()Return Value: This method returns this DoubleBuffer after setting the buffer's mark at the current position. Below are the examples to illustrate the mark() method: Examples 1:
// Java program to demonstrate
// mark() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
double[] darr = { 10.5, 20.5, 30.5, 40.5 };
// 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 reset() to restore
// to the position we marked
db.reset();
// display position
System.out.println("position after reset: "
+ db.position());
}
catch (InvalidMarkException e) {
System.out.println("New position "
+ "is less than "
+ "the position "
+ "marked before ");
System.out.println("Exception throws: "
+ e);
}
}
}
// Java program to demonstrate// mark() methodimport java.nio.*;import java.util.*;public class GFG { public static void main(String[] args) { try { double[] darr = { 10.5, 20.5, 30.5, 40.5 }; // 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 reset() to restore // to the position we marked db.reset(); // display position System.out.println("position after reset: " + db.position()); } catch (InvalidMarkException e) { System.out.println("New position " + "is less than " + "the position " + "marked before "); System.out.println("Exception throws: " + e); } }}
Output:
Examples 2: To demonstrate InvalidMarkException
position before reset: 4 position after reset: 2
// Java program to demonstrate
// mark() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
double[] darr = { 10.5, 20.5, 30.5, 40.5 };
// 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 1
db.position(1);
// display position
System.out.println("position before reset: "
+ db.position());
// try to call reset() to restore
// to the position we marked
db.reset();
// display position
System.out.println("position after reset: "
+ db.position());
}
catch (InvalidMarkException e) {
System.out.println("\nNew position "
+ "is less than "
+ "the position "
+ "marked before ");
System.out.println("Exception throws: "
+ e);
}
}
}
// Java program to demonstrate// mark() methodimport java.nio.*;import java.util.*;public class GFG { public static void main(String[] args) { try { double[] darr = { 10.5, 20.5, 30.5, 40.5 }; // 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 1 db.position(1); // display position System.out.println("position before reset: " + db.position()); // try to call reset() to restore // to the position we marked db.reset(); // display position System.out.println("position after reset: " + db.position()); } catch (InvalidMarkException e) { System.out.println("\nNew position " + "is less than " + "the position " + "marked before "); System.out.println("Exception throws: " + e); } }}
Output:
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/DoubleBuffer.html#mark--
position before reset: 1 New position is less than the position marked before Exception throws: java.nio.InvalidMarkException
