Difference between Array and Collection in java

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• Difference between Array and Collection in java

Difference between Array and Collection in java

The most important key Differences between array and collection in java are given below

Parameter	Array	Collection
1)Size	Array is fixed in size	Collection is dynamic in size
2)Data	Array can store only homogeneous data only	Collection can store homogeneous as well as hetrogeneous data
3)Data Storage	Array can store primtive as well as objects	Collections stores only object
4)Data Structure	Array does not have any standard data structure so no ready made methods available	Collection supports standard data structure so ready made methods are available
5)Memory	Memory wise array is worst choice	Memory wise collection is best choice
6)Performance	Performance wise array is good choice	Performance wise collection is worst choice

Array example in java

public class ArrayvsCollection {

	public static void main(String[] args) 
	{
		//Example of array
		int a[]= {0,2,1,4,5}; //only integer can store
		System.out.println(a.length);

	}

}
	

Collection example in java

import java.util.ArrayList;

public class ArrayvsCollection {

	public static void main(String[] args) 
	{
		//Example of collection
		ArrayList elements=new ArrayList();
		elements.add(1);
		elements.add("Hello");
		elements.add(100);
		System.out.println(elements);

	}

}