10/28/2023 0 Comments Interface based polymorphism java![]() Implement the printlnMappedMatches method in LambdaFun.java. Note: The method can (but doesn't have to) return a datatype that is different from the datatype of the Pay careful attention to the return type and the type of the formal parameter. Write the full method signature of the single, abstract method Similar to Predicate,įunction is a functional interface. Private static void printlnMappedMatches( T t, Predicate p, Function f)Īnd a reference to an object of a class that implements Predicate. Take a close look at the printlnMappedMatches method and its associated Javadoc in LambdaFun.java. Make sure your code passes checkstyle then stage and commit all changes. Try to make them interesting! Make sure to provide sufficient output so that it will be easy toĬonvince your TA or instructor that everything is working properly. ![]() You will know if everything is working correctly if the method only prints stringsĬreate three additional Predicate objects to further test your printlnMatches method on the sameĪrray. Of the single abstract method in the interface.Ĭall printlnMatches by passing in array myStrings along with your newly created Predicate variable.Ĭompile and run your code. This object contains a specific implementation P is a reference variable of an interface type and the code compiles. HOLD THE FRONT DOOR! That one line of codeĬreated a class that implemented an interface and created an object of that class! It must be the case since Variable p now references an object of type Predicate. You may wish to refer to the documentation for, provided This lambda should return true if the string argument contains the letter "a" (case sensitive).Initialize the variable using a lambda expression which provides an implementation for the single, abstract.Implement this printlnMatchesĪt the end of the main method of LambdaFun class: If you did the previous step, then you know what method(s) can be called with p. You will only need to use the object of type Predicate referred to by p to call the appropriate method. You do not need to use a lambda for this step. Implement the printlnMatches method in LambdaFun.java. In order to call this method, we need a reference to an object of a class that implements.Specifically, what reference types can replace T?.Private static void printlnMatches( T t, Predicate p)Īnswer the following questions about this method in your notes: Use Git to clone the repository for this exercise onto Odin into a subdirectory called cs1302-ce17: If context is necessary (e.g., theĬommand depends on your present working directory), then please note that context as well. NOTE: If a step requires you to enter in a command, please provide in your notes the fullĬommand that you typed to make the related action happen. In your notes, clearly answer the following questions. The Java™ Tutorials: Lambda Expressions.LO4.b: (Partial) Utilize interface-based polymorphism in a software solution.LO4.a: (Partial) Design, create and use interfaces in a software solution.LO2.e: (Partial) Utilize existing generic methods, interfaces, and classes in a software solution.LO2.d: (Partial) Implement new generic methods, interfaces, and classes in a software solution.Implementation details are left to the student. This class exercise explores functional interfaces and lambda expressions inĬonjunction with generic methods and interfaces. String decoded = new String(().decode(notSecret)) String notSecret = "VUdBIGlzIGJldHRlciB0aGFuIEdBIFRlY2g=" Employee e2 = new Agent() e2.Lockdown() N.Cs1302-ce17 Generic Method Implementation Agent a1 = new Agent() a1.signin: HasClearance hc1 = new HasClearance(): hc1.retinalScan: HasClearance hc2 new Agent: hc.requestClassified("Roswell") V. Employee et -new Employee: et requestClassified("Area 51") il. Assuming all methods have been implemented correctly, and the class constructors for Employee and Agent have no arguments, indicate which of the following snippets of code (i - v.) will work correctly, and which will not. Assume the following classes and interface are defined: -Class Employee, which has methods void signin() and void signOutl) - Interface HasClearance, which declares methods void retinalScan() and void requestClassified(String) Class Agent, which extends Employee, implements HasClearance, and has the additional method void Lockdown(). Explain the difference between inheritance-based and interface-based polymorphism. Explain what the term polymorphism means in object-oriented programming. 1) (50 pts) (Polymorphism) This problem deals with polymorphism in Java.
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