课程: Java Object-Oriented Programming

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Building objects with a constructor

Building objects with a constructor - Java教程

课程: Java Object-Oriented Programming

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Building objects with a constructor

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- [Instructor] Classes only represent a general blueprint but they become more tangible when you use a constructor to bring your blueprint to life. To create trees from our tree class we'll need to add a special type of function called a constructor to construct our tree objects. To create a constructor, we'll use the class name tree. We don't need a return type because the name of the function, tree, counts as the return type as well, since tree is the class name. This classifies it as a constructor. To build a tree we'll need to know what its height, diameter and tree type should be. This means we'll need to add inputs to the constructor so that we can construct a custom tree with the appropriate height, diameter and type. Of course, the body of the function doesn't do anything yet. We'll need to set up the tree we're building with the appropriate values. Using the, this keyword, we access the tree we're in the midst of creating, and set the height, trunk and type on the left equal…

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