题目
题目

2025FA CSC-239-01H Assessment 1

简答题

For the following code (Same as Method dispatch 1), assume that: Classes Person, Animal, Dog, and Cat are all defined. Dog and Cat are subclasses of Animal. Animal, Dog, and Cat all implement a sayHello method Person implements a greet method Look at line 10. The first time through the loop, what class does Java use for a, to choose which sayHello() method to run?

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思路分析
The question asks about which class Java uses for the variable a when evaluating a.sayHello() on the first loop iteration. First, examine the loop structure: for (Animal a : this.pets) { this.occupant.greet(a); a.sayHello(); } - The loop declares a as a reference to Animal......Login to view full explanation

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类似问题

For the following code assume that: Classes Person, Animal, Dog, and Cat are all defined. Dog and Cat are subclasses of Animal. Animal, Dog, and Cat all implement a sayHello method Person implements methods greet(Dog x), greet(Cat x), and greet(Animal x) The first time through the loop, on lines 9 and 10 (where the value of a is Spot) Which overloaded greet method will be invoked? Which overridden sayHello method will be invoked

Question at position 19 Which of the following demonstrates polymorphism?Overloading methods with different parametersUsing the private keywordDeclaring all methods as staticExtending a class without adding any new methodsClear my selection

Question at position 7 In Java, what must be true for polymorphism to occur during runtime?Method overriding in subclassesClasses must not extend other classesMethod overloading in the parent classVariables declared as protectedClear my selection

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