Meanings of declaring, instantiating, initializing and assigning an object

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Declaring – Declaring a variable means to introduce a new variable to the program. You define its type and its name.

int a; //a is declared

Instantiate – Instantiating a class means to create a new instance of the class. Source.

MyObject x = new MyObject(); //we are making a new instance of the class MyObject

Initialize – To initialize a variable means to assign it an initial value.

int a; //a is declared
int a = 0; //a is declared AND initialized to 0
MyObject x = new MyObject(); //x is declared and initialized with an instance of MyObject

Assigning – Assigning to a variable means to provide the variable with a value. 

int a = 0; //we are assigning to a; yes, initializing a variable means you assign it a value, so they do overlap!
a = 1; //we are assigning to a

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