In Java, which of the following is false? An abstract class may implement an interface. A class that contains an abstract method must be declared abstract itself or a compiler message will result. A class may implement multiple interfaces. A class that extends another class may implement only one interface.
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In Java, which of the following is false?
- An abstract class may implement an interface.
- A class that contains an abstract method must be declared abstract itself or a compiler message will result.
- A class may implement multiple interfaces.
- A class that extends another class may implement only one interface.
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- In Java, what is the difference between the Comparable interface and the Comparator interface? Group of answer choices 1. None of the above options are correct. 2. Comparable is an interface, while comparators is an abstract class. 3. Implementing Comparable allows the implementing class to compare instances of itself to other objects, while the Comparator interface is implemented by an auxiliary class that compares two objects of a given type. 4. Comparable guarantees that you can check for equality, while Comparator guarantees that you can order the items.Write the definition of classes and interfaces in the given diagram using following details: a) Interface shape has a method draw(). b) Override the method draw() in all subclasses. c) Define a non-abstract method fillColor() in Circle class. (I want the complete solution using the codes in bluej program also diagram) bluej java coodExplain the difference between an interface and an abstract class.
- What is an abstract class? Choose only one option.(a) An object(b) A class with no methods.(c) A class with no concrete subclasses.(d) A class with at least one undefined message.(e) An interface.What are the differences between abstract classes and interfaces?Answer the following questions.a. How Java compensated for the absence of multiple inheritance?b. A class that contains any abstract methods must be declared as an abstractclass even if that class contains some concrete (nonabstract) methods, why?c. Abstract class cannot be instantiated, why?d. Interfaces cannot contain constructors, why?e. In interfaces, data member should be initialized in the declaration, why?f. An interface cannot declare static methods. It can only declare instancemethods, why?
- Abstract classes and interfaces can both be used to specify common behavior of objects.How do you decide whether to use an interface or an abstract class? Explain youranswer.Create a short program in Java which contains the below information: - Has one abstract and two regular classes - Has two interfaces (the two regular classes have to implement at least one interface - At least one regular class must implement both interfaces - The two classes have to extend the abstract class - The abstract class must have a method - At least one interface must have a method - At least two fields in each class, this includes the superclass - All fields are instantiated within the constructorWrite a java code that: a) Creates an abstract method in a superclass, then overrides it in a subclass. (Only show the methods in both classes). b) Provides a method PrintInfo () that prints your group info and can be used only in classes of the same package. c) Provides a non-overridden area() that calculates area. (choose a shape)
- Do the following program in Java Eclipse. Java Class that can be used to create a Fruit object as described below: A fruit has - a: - Date of Harvest -Color -Weight -Number of seeds a. Add all instance variables. b. The class must have getters and setters for all instance variables. c. The class must have two constructors, a no-args and a constructor that receives input for each instance variables. d. The parent class is abstract. e. its 1 abstract method and has toString() method f. its 2 children (concrete) also have toString() methods.What are the most important differences that distinguish interfaces from abstract classes?What are the primary distinctions between abstract classes and interfaces?