Basic Operations on Arrays - Python vs. Java

Below , we have listed the difference between array operations between Python and Java.

Python	Java
Python Array Declaration of 2 integers	Java Array Decalaration of 2 integers
>>> arr = [0] * 2 >>> arr[0] 0 >>> arr[0] = 10 >>> arr[1] = 2 >>> arr[2] = 9 Traceback (most recent call last):   File "<stdin>", line 1, in <module> IndexError: list assignment index out of range >>> arr.append(2) # this feature is not available in Java primitive arrays >>>	public class hello_world {  public static void main(String[] args) {   int[] arr = new int[2];   arr[0] = 10;   arr[1] = 9;   arr[2] = 5;   System.out.println(arr[0] + " " + arr[1]);    } } >> Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2  at com.dmac.analytics.spark.hello_world.main(hello_world.java:9)
We can append values to an existing array in python.	In Java, a traditional array has to be reassigned to a new array with larger space allocated.

Java also has a library that can use create a list that is mutable.

Read up on java.util.List() to know more about the java data structure.

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