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What is the IntBuffer get() method in Java?

Samia Ishaque

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

What is IntBuffer?

InfBuffer is a class in Java that is defined inside the java.nio package. The java.nio package defines buffers, which are a chunk of readable and writeable memory that can be used to easily communicate over NIO channels. There are many types of buffers in the java.nio package, including IntBuffer. It is similar to arrays of different data types with different sizes.

The class IntBuffer allows for various operations, which are as follows:

  • absolute and relative get methods that read single ints.
  • absolute and relative put methods that write single ints.
  • relative bulk get method that can allocate a contiguous chunk of memory from the buffer into arrays.
  • relative bulk put method that can allocate contiguous memory from an int array to a buffer.

Overview

The get method is used to return the integer at the current position and increase the current position by one. The prototype of the get method in the IntBuffer class is as follows:

public abstract int get()

However, another version of the get method is used to get an element from the buffer from a certain index. The prototype for this function is as follows:

public abstract int get(int index)

Parameters

There is no mandatory parameter for the get method. However, the BufferUnderflowException is raised if the current position is not less than the limit.

However, if one wishes to get the element from an index, the parameter will be the index number we wish to retrieve the integer from. IndexOutOfBoundsException is raised when the index is too big or small compared to the capacity of the buffer.

Return value

The get() method returns the integer at the current position.

On the other hand, the get(int index) method returns the index at that index.

Example

The following example will help you understand the get method better. First, we create a buffer and put elements in it using the put method. However, as the put method adds to the current position, we use the clear method to reset the current position to 0. Without using clear, we would get a BufferUnderflowException. Then, we use the get method to get the element from the current position as well at index 0, which are both the same elements. We print and compare the two to see that we are getting the correct results.

import java.nio.*;
import java.util.*;
public class main{
public static void main(String[] args)
{
int cap = 3;
IntBuffer buffer = IntBuffer.allocate(cap);
buffer.put(2);
buffer.put(3);
buffer.put(4);
System.out.println("Printing the buffer: "
+ Arrays.toString(buffer.array()));
buffer.clear();
int i = buffer.get();
System.out.println("Current position: " + i);
int j = buffer.get(0);
System.out.println("Value at index 0: " + j);
}
}

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Samia Ishaque
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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