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Unit 9

9.3 Overriding Methods

1 min readβ€’november 16, 2020

Peter Cao

Now that we know how to make subclasses and their constructors, it is time to write their methods. Most methods that are inherited from the superclass do not need to be rewritten. However, some methods will have to be rewritten because their implementations will be different. This can be done by overloading, where the parameters for the methods are different but the methods achieve the same thing.


The other way of doing this is overriding, which is when the method will have the same parameters, but their implementations will be different. Above the method header, we have to write @Override to show that this is an overridden method. For an overridden method, we usually don't have to write Javadoc comments since those should be inherited from the superclass. In the Rectangle class, we will override the area method as follows:
/** Represents a rectangle */ public class Rectangle extends Quadrilateral { /** Makes a rectangle given a length and width */ public Rectangle(double length, double width) { super(length, width, length, width); } @Override public double Area() { return sideOne * sideTwo; // from the constructor length is sideOne and width is sideTwo } }

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Unit 10: Recursion
Unit 1: Primitive Types
Unit 2: Using Objects
Unit 3: Boolean Expressions and if Statements
Unit 4: Iteration
Unit 5: Writing Classes
Unit 6: Array
Unit 7: ArrayList
Unit 8: 2D Array
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