LongBuffer clear() method in Java with Examples

The clear() method of java.nio.LongBuffer 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 LongBuffer clear()

Parameter: The method do not take any parameter.



Return Value: This method returns this LongBuffer instance after clearing all the data from it.

Below are the examples to illustrate the clear() method:

Examples 1:

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// Java program to demonstrate
// clear() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        try {
  
            long[] arr = { 10, 20, 30, 40 };
  
            // creating object of LongBuffer
            // and allocating size capacity
            LongBuffer lb
                = LongBuffer.wrap(arr);
  
            // try to set the position at index 2
            lb.position(2);
  
            // Set this buffer mark position
            // using mark() method
            lb.mark();
  
            // try to set the position at index 4
            lb.position(4);
  
            // display position
            System.out.println("position before reset: "
                               + lb.position());
  
            // try to call clear() to restore
            // to the position at index 0
            // by discarding the mark
            lb.clear();
  
            // display position
            System.out.println("position after reset: "
                               + lb.position());
        }
  
        catch (InvalidMarkException e) {
            System.out.println("new position is less than "
                               + "the position we "
                               + "marked before ");
            System.out.println("Exception throws: " + e);
        }
    }
}

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Output:

position before reset: 4
position after reset: 0

Examples 2:

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// Java program to demonstrate
// clear() method
  
import java.nio.*;
import java.util.*;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        long[] arr = { 10, 20, 30, 40 };
  
        // creating object of LongBuffer
        // and allocating size capacity
        LongBuffer lb = LongBuffer.wrap(arr);
  
        // try to set the position at index 3
        lb.position(3);
  
        // display position
        System.out.println("position before clear: "
                           + lb.position());
  
        // try to call clear() to restore
        // to the position at index 0
        // by discarding the mark
        lb.clear();
  
        // display position
        System.out.println("position after clear: "
                           + lb.position());
    }
}

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Output:

position before clear: 3
position after clear: 0

Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/LongBuffer.html



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