java 36 | Arrays as objects in java | Array of References of any object

Array is a collection of objects of same type.
In java when you create an array that array is an object.

“ Arrays are objects in java that store multiple object references or primitives of same data type”
int [] scores;
Declaration of an array variable does not allocate any space in memory for array, only a storage location for the reference to an array is created.


Scores = new int [5];
Array must always be given a size at the time they are constructed

Lets understand step by step
1) Dog [] myDogs ;
Declaration of an array variable does not allocate any space in memory for array, only a storage location for the reference to an array is created.



If a variable does not refer to an array, the value of the variable is null.
Here myDogs is null



myDogs =new Dog[3];
We want to create an array of references of type Dog so a new object is created
All of them are initially null
It will be referred by myDog
Dog puppy = new Dog(“tommy”);
A new object is created of type Dog which will be referred by puppy

myDogs[0]=puppy;
Whatever puppy was referring to, is now being referred by myDogs[0];
myDogs[1] = new Dog( “Jacky”);
One new object has to be created of type Dog ( name is set to Jacky)
And myDogs[1] is going to refer this object
myDogs[2] = new Dog (“Tuffy”);
A new object of type Dog is created
And the reference will be stored in myDogs[2]

Assignment
Write a java program to create an array of Employee, (where Employee has properties i.e. name, id, age and city ) , ask the user to enter the details and print the details.
Write a program to find the largest and smallest element in the given array?
Given an array A[], write a program to check whether the element "x" present in the array or not?
Write a program to reverse the given array?