ByteBuffer mark() methods in Java with Examples
Last Updated :
27 Jun, 2019
The mark() method of java.nio.ByteBuffer Class is used to set this buffer’s mark at its position.
Syntax:
public ByteBuffer mark()
Return Value: This method returns this buffer.
Below are the examples to illustrate the mark() method:
Examples 1:
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
byte [] barr = { 10 , 20 , 30 , 40 };
ByteBuffer bb = ByteBuffer.wrap(barr);
bb.position( 2 );
bb.mark();
bb.position( 4 );
System.out.println( "position before reset: "
+ bb.position());
bb.reset();
System.out.println( "position after reset: "
+ bb.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: 2
Examples 2: To demonstrate InvalidMarkException
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
byte [] barr = { 10 , 20 , 30 , 40 };
ByteBuffer bb = ByteBuffer.wrap(barr);
bb.position( 2 );
bb.mark();
bb.position( 1 );
System.out.println( "position before reset: "
+ bb.position());
bb.reset();
System.out.println( "position after reset: "
+ bb.position());
}
catch (InvalidMarkException e) {
System.out.println( "\nnew position is less than "
+ "the position we marked before " );
System.out.println( "Exception throws: " + e);
}
}
}
|
Output:
position before reset: 1
new position is less than the position we marked before
Exception throws: java.nio.InvalidMarkException
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#mark–
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