JAVA Interfaces and Abstract Classes In Java, declaring a class abstract is useful When it makes sense to have objects of that class. To prevent developers from further extending the class. When default implementations of some methods are not desirable. When it doesn't make sense to have objects of that class. To force developers to extend the class not to use its capabilities. When it makes sense to have objects of that class. To prevent developers from further extending the class. When default implementations of some methods are not desirable. When it doesn't make sense to have objects of that class. To force developers to extend the class not to use its capabilities. ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes What will be the output?interface A{public void method();}class One{public void method(){System.out.println("Class One method");}}class Two extends One implements A{public void method(){System.out.println("Class Two method");}}public class Test extends Two{public static void main(String[] args){A a = new Two();a.method();}} will print Class One method Compilation Error compiles fine but print nothing will print Class Two method None of these will print Class One method Compilation Error compiles fine but print nothing will print Class Two method None of these ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Runnable is a _____ . class method interface vaiable abstract class class method interface vaiable abstract class ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes What happens if the following program is compiled and executed?interface MyInterface{ void display();}interface MySubInterface extends MyInterface{ void display();}public class Test implements MySubInterface{ public void display(){ System.out.print("Welcome to Examveda."); } public static void main(String args[]){ Test t = new Test(); t.display(); }} The code will compile and execute successfully showing the output Welcome to Examians. The code will lead to a compilation error as declaration of the display method has been provided in two interface. The code will lead to a compilation error as the display method is not declared as abstract. The code will lead to a compilation error due to public modifier while declaring the display method. None of these The code will compile and execute successfully showing the output Welcome to Examians. The code will lead to a compilation error as declaration of the display method has been provided in two interface. The code will lead to a compilation error as the display method is not declared as abstract. The code will lead to a compilation error due to public modifier while declaring the display method. None of these ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?1. A a = new A();2. A a = new B();3. B b = new A();4. B b = new B(); 3 and 4 2 and 4 1 and 2 2 and 3 1 and 3 3 and 4 2 and 4 1 and 2 2 and 3 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Given the following piece of code:public class School{ public abstract double numberOfStudent();}which of the following statements is true? The keywords public and abstract cannot be used together. Class School must be defined abstract. You must add a return statement in method numberOfStudent(). The method numberOfStudent() in class School must have a body. The keywords public and abstract cannot be used together. Class School must be defined abstract. You must add a return statement in method numberOfStudent(). The method numberOfStudent() in class School must have a body. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS