Notes from Week 5Writing Methods is a two-step processWriting the method (defining the method)Method Writing - Method SignatureSlide 5Slide 6Method Writing - Method BodyMethod CallingStringsPrinting information to the console (screen)InheritanceGeneralization RelationshipInheritance BasicsAccessors & MutatorsMethod OverloadingAccessors (get methods)Mutators (set methods)Notes from Week 5CSE 115 Spring 2006February 13, 15 & 17, 2006Writing Methods is a two-step processGive definition of how method will perform – write the method.When we want the work of the method to actually get done – the method call.Writing the method (defining the method)Specify Method Signature:VisibilityReturn typeName for methodParameter listSpecify Method Body:Code that method must execute to perform required task.Method Writing - Method SignatureVisibility public is best if you want anyone to be able to call your methods.Return typevoid if nothing is returned.If something is returned, need to use keyword return in method body to indicate value being returned.Method Writing - Method SignatureGive the method a name (mind the rules)Method is an identifierStyle: first letter lower case, each subsequent word capitalized.Eg) myFirstMethodMethod Writing - Method SignatureParameters (formal parameters)Specify for eachTypeNameWhy do parameters get a name in the method definition?So we can refer to them inside the method body.Method Writing - Method BodyCode that is executed when method is called.Need additional variables inside the method?Create a local variable.Local variables are only accessible from inside the method body.Method CallingMethod call:instanceName.methodName();Pass in actual values for each of the required parameters. (actual parameters)Do something with the return type if there is one. (What if you don’t?)StringsList of CharactersCharacters are any single letter, digit, or symbolIn code:”Strings are surrounded by quotes”Printing information to the console (screen)System.out.println(”Some text.”);InheritanceCan be viewed as a specialization of a superclass.Can be viewed as generalizing several subclasses into a superclass.Generalization Relationship“is a” relationshipThere is a superclass and a subclassIn code:public class ClassB extends ClassA {}Inheritance BasicsWhen a subclass extends a superclass, the subclass inherits all public capabilities (methods) of the superclass and they remain public in the subclass.When a class has a superclass and we create an instance of the subclass, the no-argument constructor of the superclass is called automatically from the constructor of the subclass.Accessors & MutatorsMethods inside of a class that work with the instance variables to provide the value of the instance variable and to change the value of the instance variable respectfully.Method OverloadingTwo methods can have the same name only if they differ in number and/or type of parameters.Constructors can be overloaded too!Accessors (get methods)Access the value of an instance variable.public TypeOfProperty getProperty(){return _instanceVariableName;}Mutators (set methods)Change the value of an instance variable.public void setProperty (TypeOfProperty newValue) {_instanceVariableName =