Which would declare a compilable abstract class?Select one:a.public abstract class Shape { public Square draw(); }b.public abstract class Shape { public Square draw() { } }c.public class Shape abstract { public abstract Square draw(); }d.public class Shape { public abstract Square draw(); }
Question
Which would declare a compilable abstract class?Select one:a.public abstract class Shape { public Square draw(); }b.public abstract class Shape { public Square draw() { } }c.public class Shape abstract { public abstract Square draw(); }d.public class Shape { public abstract Square draw(); }
Solution
The correct answer is:
a. public abstract class Shape { public abstract Square draw(); }
Explanation:
An abstract class in Java is a class that cannot be instantiated (you cannot create objects of an abstract class). It is used to declare common characteristics of subclasses.
Option a is the correct way to declare an abstract class in Java. The keyword 'abstract' is used before the class keyword to declare an abstract class. The method 'draw()' is also declared as abstract, which means it does not have a body and must be implemented in any class that extends this abstract class.
Option b is incorrect because an abstract method cannot have a body.
Option c is incorrect because the keyword 'abstract' should come before 'class', not after.
Option d is incorrect because a non-abstract class cannot have abstract methods.
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Which two classes use the Shape class correctly?A. public class Circle implements Shape { private int radius; }B. public abstract class Circle extends Shape { private int radius; }C. public class Circle extends Shape { private int radius; public void draw(); }D. public abstract class Circle implements Shape { private int radius; public void draw(); }E. public class Circle extends Shape { private int radius; public void draw() { /* code here */ } }F. public abstract class Circle implements Shape { private int radius; public void draw() { /* code here */ } }OptionsA,CB,EC,ET,H
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