Buffer capacity() method in Java with Examples Last Updated : 18 Jul, 2019 Comments Improve Suggest changes Like Article Like Report The capacity() method of java.nio.Buffer Class is used to return this buffer's capacity. Syntax: public final int capacity() Return Value: The capacity of this buffer Below are the examples to illustrate the capacity() method: Examples 1: Java // Java program to demonstrate // capacity() method import java.nio.*; import java.util.*; public class GFG { public static void main(String[] args) { // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.allocate(7); // putting the int to byte typecast // value in ByteBuffer bb.put((byte)20); bb.put((byte)30); bb.put((byte)40); bb.put((byte)50); // Typecasting ByteBuffer into Buffer Buffer bb1 = (Buffer)bb; // getting capacity of Buffer // using capacity() method int cap = bb1.capacity(); // display the result System.out.println("capacity is: " + cap); } } Output: capacity is: 7 Examples 2: Java // Java program to demonstrate // capacity() method import java.nio.*; import java.util.*; public class GFG { public static void main(String[] args) { // Declaring and initializing byte array byte[] byt = { (byte)20, (byte)30, (byte)40, (byte)50, (byte)60 }; // creating object of ByteBuffer // and allocating size capacity ByteBuffer bb = ByteBuffer.wrap(byt); // Typecasting ByteBuffer into Buffer Buffer bb1 = (Buffer)bb; // getting capacity of Buffer // using capacity() method int cap = bb1.capacity(); // display the result System.out.println("capacity is: " + cap); } } Output: capacity is: 5 Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#capacity-- Comment More infoAdvertise with us Next Article Buffer capacity() method in Java with Examples rohitprasad3 Follow Improve Article Tags : Java Java-Functions Java-NIO package Java-Buffer Practice Tags : Java Similar Reads ByteBuffer compact() method in Java with Examples The compact() method of java.nio.ByteBuffer class is used to compact the given buffer.The bytes between the buffer's current position and its limit, if any, are copied to the beginning of the buffer. 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