When you call the flip() method on a buffer, below things
will be taken place.
a. Set the
limit to current position.
b. Set the
current position to zero.
c. mark
will be set to undefined state (mark = -1).
Find the below working application.
Test.java
package com.sample.nio; import java.nio.ByteBuffer; public class Test { private static final String ALPHABETS = "abcdefghijklmnopqrstuvwxyz"; private static void printStats(ByteBuffer byteBuffer) { int currentPosition = byteBuffer.position(); int activeElePosition = byteBuffer.limit(); System.out.println("position : " + currentPosition + ", limit : " + activeElePosition); System.out.println("\n"); } public static void main(String args[]) throws Exception { /* Define new byte buffer of capacity 11 */ ByteBuffer byteBuffer = ByteBuffer.allocate(26); System.out.println("Before inserting the data into buffer"); printStats(byteBuffer); for (int i = 0; i < ALPHABETS.length(); i++) { byteBuffer.put((byte) ALPHABETS.charAt(i)); } System.out.println("After inserting 26 characters into the buffer"); printStats(byteBuffer); byteBuffer.flip(); System.out.println("After calling flip() api on the buffer"); printStats(byteBuffer); System.out.println("Setting the limit to 10"); byteBuffer.limit(10); printStats(byteBuffer); byteBuffer.flip(); System.out.println("After calling flip() api again on the buffer"); printStats(byteBuffer); } }
Output
Before inserting the data into buffer position : 0, limit : 26 After inserting 26 characters into the buffer position : 26, limit : 26 After calling flip() api on the buffer position : 0, limit : 26 Setting the limit to 10 position : 0, limit : 10 After calling flip() api again on the buffer position : 0, limit : 0
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