Create A Regular Constructor

If you want to “construct” an object each time you create an object with PRE-DEFINED or DEFAULT VALUES, you can create a specialized method called a no argument constructor that is called when the object is first created.

NOTE: You could create an object without a constructor but it would have NO STATES. Then, you could add values to set the INITIAL STATES afterward. However, a no argument constructor allows you to create an object and INITIALIZE it with DEFAULT VALUES at the SAME time.

REPLACE LATER WITH OWN SCREENSHOTS

Before:

 

After:

public class MyCustomBox {
// DEFINING instance variables (properties)
public String height;
public String width;

// regular constructor method for 2D object
public MyCustomBox()
{
// ASSSIGNING instance variables (properties)
height = 100;
width = 100;
}
// Other methods here...
}

Now, create an object (a 2D object) from the class:

MyCustomBox my2DBox = new MyCustomBox();

Both the height and width properties would be 100:
height:100
width: 100

NOTES:

• The constructor has the SAME name as the class. That’s how you can distinguish it from methods in a class.
• There is NO return type (not even void) because it is only called when the object is created.
• The constructor method ensures that any VARIABLES belonging to that object is IMMEDIATELY SET WITH DEFAULT VALUES when the object is created.