CONSTRUCTOR IN JAVA HOW TO

For the return type, the constructor always returns an instance of the class, in this case an instance of triangle. Then we have open-close parentheses for the inputs to the function and brackets for the implementation of the function.

What does a constructor look like? Since it's a function, it has a name and that name is always the same as the name of the class, so in this case, triangle. We call this special function inside the Triangle class. It's how we can create triangleA with specific base, height, and side length values, and then construct triangleB with different attribute values.

Every class has a constructor and it's how we create and initialize each triangle we want to use in our program. So how do we create these instances? We use a special method or behavior called a constructor. From our single Triangle class, we can create as many instances as we want and each instance will have its own base, height, and side length attribute variables. Another instance of a triangle could have base three, height 2.598, and side lengths three, three, and three. An instance of a triangle, say named triangleA, could have a base 15, height eight, and sides with lengths 15, eight, and 17. Thinking back to our triangle class, a triangle has a base height and three side lengths. Just like we make buildings from blueprints in real life we use a class or blueprint to create objects or instances in code. An instance is an object created from the class blueprint.

CONSTRUCTOR IN JAVA HOW TO

In this lesson, we are going to learn how to create individual triangle instances in our program. We just defined the attributes and behavior of a triangle in a blueprint. But we haven't created any triangles yet. In the last lesson, we defined the Triangle class or triangle blueprint. Similarly, we have to define a blueprint or class in order to use it. When we were talking about functions in an earlier chapter, we had to define a function in order to call it.

Constructor in java