LongBuffer flip() method in Java with Examples

The flip() method of java.nio.LongBuffer Class is used to flip this buffer. By flipping this buffer, it meant that

• the buffer will be trimmed to the current position
• the then the position will be changed to zero
• if any mark is there on the buffer, then that mark will be automatically discarded

Syntax:

public final LongBuffer flip()

Parameter: This method do not accept any parameter.

Return Value: This method returns the flipped LongBuffer instance.

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

Examples 1:

// Java program to demonstrate
// flip() method

import java.nio.*;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // Declare and initialize
        // the long array
        long[] db
            = { 10, 20, 30 };

        // wrap the long array
        // into LongBuffer
        // using wrap() method
        LongBuffer longBuffer
            = LongBuffer.wrap(db);

        // set position at index 1
        longBuffer.position(1);

        // print the buffer
        System.out.println(
            "Buffer before flip: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.limit());

        // Flip the Buffer
        // using flip() method
        longBuffer.flip();

        // print the buffer
        System.out.println(
            "\nBuffer after flip: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.limit());
    }
}

Output:

Buffer before flip: [10, 20, 30]
Position: 1
Limit: 3

Buffer after flip: [10, 20, 30]
Position: 0
Limit: 1

Examples 2:

// Java program to demonstrate
// flip() method

import java.nio.*;
import java.util.*;

public class GFG {
    public static void main(String[] args)
    {

        // defining and allocating LongBuffer
        // using allocate() method
        LongBuffer longBuffer
            = LongBuffer.allocate(4);

        // put long value in LongBuffer
        // using put() method
        longBuffer.put(20);
        longBuffer.put(34);

        // set position at index 1
        longBuffer.position(1);

        // print the buffer
        System.out.println(
            "Buffer before flip: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.limit());

        // Flip the Buffer
        // using flip() method
        longBuffer.flip();

        // print the buffer
        System.out.println(
            "\nBuffer after flip: "
            + Arrays.toString(
                  longBuffer.array())
            + "\nPosition: "
            + longBuffer.position()
            + "\nLimit: "
            + longBuffer.limit());
    }
}

Output:

Buffer before flip: [20, 34, 0, 0]
Position: 1
Limit: 4

Buffer after flip: [20, 34, 0, 0]
Position: 0
Limit: 1

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