Buffer flip() methods in Java with Examples Last Updated : 18 Jul, 2019 Summarize Comments Improve Suggest changes Share Like Article Like Report The flip() method of java.nio.ByteBuffer Class is used to flip this buffer. The limit is set to the current position and then the position is set to zero. If the mark is defined then it is discarded. After a sequence of channel-read or put operations, invoke this method to prepare for a sequence of channel-write or relative get operations. For example: buf.put(magic); // Prepend header in.read(buf); // Read data into rest of buffer buf.flip(); // Flip buffer out.write(buf); // Write header + data to channel This method is often used in conjunction with the compact() method when transferring data from one place to another. Syntax: public Buffer flip() Return Value: This method returns this buffer. Below are the examples to illustrate the flip() method: Examples 1: Java // 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 byte array byte[] bb = { 10, 20, 30 }; // wrap the byte array into ByteBuffer // using wrap() method ByteBuffer byteBuffer = ByteBuffer.wrap(bb); // Typecast ByteBuffer to Buffer Buffer buffer = (Buffer)byteBuffer; // set position at index 1 buffer.position(1); // print the buffer System.out.println("Buffer before flip: " + Arrays.toString((byte[])buffer.array()) + "\nPosition: " + buffer.position() + "\nLimit: " + buffer.limit()); // Flip the Buffer // using flip() method buffer.flip(); // print the buffer System.out.println("\nBuffer after flip: " + Arrays.toString((byte[])buffer.array()) + "\nPosition: " + buffer.position() + "\nLimit: " + buffer.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 // Java program to demonstrate // flip() method import java.nio.*; import java.util.*; public class GFG { public static void main(String[] args) { // defining and allocating ByteBuffer // using allocate() method ByteBuffer byteBuffer = ByteBuffer.allocate(4); // put byte value in byteBuffer // using put() method byteBuffer.put((byte)20); byteBuffer.put((byte)30); // Typecast ByteBuffer to Buffer Buffer buffer = (Buffer)byteBuffer; // set position at index 1 buffer.position(1); // print the buffer System.out.println("Buffer before flip: " + Arrays.toString((byte[])buffer.array()) + "\nPosition: " + buffer.position() + "\nLimit: " + buffer.limit()); // Flip the Buffer // using flip() method buffer.flip(); // print the buffer System.out.println("\nBuffer after flip: " + Arrays.toString((byte[])buffer.array()) + "\nPosition: " + buffer.position() + "\nLimit: " + buffer.limit()); } } Output: Buffer before flip: [20, 30, 0, 0] Position: 1 Limit: 4 Buffer after flip: [20, 30, 0, 0] Position: 0 Limit: 1 Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#flip-- Comment More infoAdvertise with us Next Article DoubleBuffer flip() methods in Java with Examples R rohitprasad3 Follow Improve Article Tags : Java Java-Functions Java-NIO package Java-Buffer Practice Tags : Java Similar Reads DoubleBuffer flip() methods in Java with Examples The flip() method of java.nio.DoubleBuffer Class is used to flip this buffer. By flipping this buffer, it meant that the buffer will be trimmed to the current position and then the position will be changed to zero. During this process, if any mark is there on the buffer, then that mark will be autom 2 min read Buffer mark() methods in Java with Examples The mark() method of java.nio.Buffer Class is used to set this buffer's mark at its position.Syntax: public Buffer mark() Return Value: This method returns this buffer.Below are the examples to illustrate the mark() method:Examples 1: Java // Java program to demonstrate // mark() method import java. 2 min read Buffer clear() methods in Java with Examples The clear() method of java.nio.ByteBuffer Class is used to clear this buffer. The position is set to zero, the limit is set to the capacity, and the mark is discarded. Invoke this method before using a sequence of channel-read or put operations to fill this buffer. For example: buf.clear(); // Prepa 3 min read Buffer array() methods in Java with Examples The array() method of java.nio.Buffer class is used to return the array that backs the taken buffer. This method is intended to allow array-backed buffers to be passed to native code more efficiently. Concrete subclasses provide more strongly-typed return values for this method. Modifications to thi 3 min read Buffer limit() methods in Java with Examples The limit() method of java.nio.Buffer Class is used to set this buffer's limit. If the position is larger than the new limit then it is set to the new limit. If the mark is defined and larger than the new limit then it is discarded. Syntax: public Buffer limit(int newLimit) Return Value: This method 2 min read Buffer reset() methods in Java with Examples The reset() method of java.nio.Buffer Class is used to reset this buffer's position to the previously-marked position. Invoking this method neither changes nor discards the mark's value.Syntax: public Buffer reset() Return Value: This method returns this buffer.Below are the examples to illustrate t 2 min read Like