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 1 and 2 2 and 4 2 and 3 1 and 3 3 and 4 1 and 2 2 and 4 2 and 3 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes What is the output for the below code ?interface A{ public void printValue();}1. public class Test{2. public static void main (String[] args){3. A a1 = new A(){4. public void printValue(){5. System.out.println("A");6. }7. };8. a1.printValue();9. }10. } Compilation fails due to an error on line 3 Compilation fails due to an error on line 8 null None of these A Compilation fails due to an error on line 3 Compilation fails due to an error on line 8 null None of these A ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Which two of the following are legal declarations for abstract classes and interfaces?1. final abstract class Test {}2. public static interface Test {}3. final public class Test {}4. protected abstract class Test {}5. protected interface Test {}6. abstract public class Test {} 1 and 2 3 and 6 3 and 5 5 and 6 2 and 4 1 and 2 3 and 6 3 and 5 5 and 6 2 and 4 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Runnable is a _____ . vaiable class abstract class interface method vaiable class abstract class interface method ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Which of the following class definitions defines a legal abstract class? abstract class A { abstract void unfinished(); } public class abstract A { abstract void unfinished(); } class A { abstract void unfinished() { } } class A { abstract void unfinished(); } abstract class A { abstract void unfinished(); } public class abstract A { abstract void unfinished(); } class A { abstract void unfinished() { } } class A { abstract void unfinished(); } ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Which of the following statements regarding abstract classes are true? All of these A subclass can override a concrete method in a superclass to declare it abstract. A subclass of a non-abstract superclass can be abstract. An abstract class can be extended. An abstract class can be used as a data type. All of these A subclass can override a concrete method in a superclass to declare it abstract. A subclass of a non-abstract superclass can be abstract. An abstract class can be extended. An abstract class can be used as a data type. ANSWER DOWNLOAD EXAMIANS APP
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