The hashCode() method of java.nio.ByteBuffer class is used to return the current hash code of this buffer. The hash code of a byte buffer depends only upon its remaining elements; that is, upon the elements from position() up to, and including, the element at limit() – 1. Because buffer hash codes are content-dependent, it is inadvisable to use buffers as keys in hash maps or similar data structures unless it is known that their contents will not change.
Syntax:
public int hashCode()
Return Value: This method returns the current hash code of this buffer. Below are the examples to illustrate the hashCode() method: Examples 1:
Java
// Java program to demonstrate// hashCode() methodimport 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(12); // putting the int value in the bytebuffer bb.asIntBuffer() .put(10) .put(20) .put(30); // rewind the Bytebuffer bb.rewind(); // print the ByteBuffer System.out.println("Original ByteBuffer: "); for (int i = 1; i <= 3; i++) System.out.print(bb.getInt() + " "); // rewind the Bytebuffer bb.rewind(); // Reads the Int at this buffer's current position // using hashCode() method int value = bb.hashCode(); // print the int value System.out.println("\n\nByte Value: " + value); }} |
Output:
Original ByteBuffer: 10 20 30 Byte Value: -219122491
Examples 2:
Java
// Java program to demonstrate// hashCode() methodimport 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(12); // Reads the Int at this buffer's current position // using hashCode() method int value = bb.hashCode(); // print the int value System.out.println("Byte Value: " + value); }} |
Output:
Byte Value: -293403007
Reference: https://docs.oracle.com/javase/9/docs/api/java/nio/ByteBuffer.html#hashCode–
