How to create an object

• To create an object, you use the new keyword to create a new instance of a class.
• Each time the new keyword creates an object, Java calls the constructor for the object, which initializes the instance variables for the object.
• After you create an object, you assign it to a variable. When you do, a reference to the object is stored in the variable. Then, you can use the variable to refer to the object.
• To send arguments to the constructor, code the arguments within the parentheses that follow the class name, separated by commas.
• The arguments you send must be in the sequence and have the data types called for by the constructor.

How to create an object in two statements

ClassName variableName;
variableName = new ClassName(argumentList);

Example with no arguments

Product product;
product = new Product();

How to create an object in one statement

ClassName variableName = new ClassName(argumentList);

Example 1: No arguments

Product product = new Product();

Example 2: One literal argument

Product product = new Product("java");

Example 3: One variable argument

Product product = new Product(productCode);

Example 4: Three arguments

Product product = new Product(code, description, price);