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ByteBuffer hashCode() method in Java with Examples

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source link: https://www.geeksforgeeks.org/bytebuffer-hashcode-method-in-java-with-examples/
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ByteBuffer hashCode() method in Java with Examples

  • Last Updated : 17 Jun, 2019

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 program to demonstrate
// getInt() 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(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 getInt() 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 program to demonstrate
// getInt() 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(12);
// Reads the Int at this buffer's current position
// using getInt() 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–

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