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(); 2 and 3 3 and 4 1 and 3 2 and 4 1 and 2 2 and 3 3 and 4 1 and 3 2 and 4 1 and 2 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(); } class A { abstract void unfinished() { } } public class abstract A { abstract void unfinished(); } class A { abstract void unfinished(); } abstract class A { abstract void unfinished(); } class A { abstract void unfinished() { } } public class abstract A { abstract void unfinished(); } class A { abstract void unfinished(); } ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes What will be the output?1. public interface InfA{2. protected String getName();3. }public class Test implements InfA{ public String getName(){ return "test-name"; } public static void main (String[] args){ Test t = new Test(); System.out.println(t.getName()); }} None of these test-name Compilation succeed but Runtime Exception Compilation fails due to an error on lines 2 Compilation fails due to an error on lines 1 None of these test-name Compilation succeed but Runtime Exception Compilation fails due to an error on lines 2 Compilation fails due to an error on lines 1 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes What will be the output for the below code ?public interface TestInf{ int i =10;}public class Test{ public static void main(String... args){ TestInf.i=12; System.out.println(TestInf.i); }} Compile with error None of these 10 12 Runtime Exception Compile with error None of these 10 12 Runtime Exception 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. } None of these A null Compilation fails due to an error on line 3 Compilation fails due to an error on line 8 None of these A null Compilation fails due to an error on line 3 Compilation fails due to an error on line 8 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Which of the following declares an abstract method in an abstract Java class? public abstract void method() {} public void method() {} public void abstract Method(); public abstract method(); public abstract void method(); public abstract void method() {} public void method() {} public void abstract Method(); public abstract method(); public abstract void method(); ANSWER DOWNLOAD EXAMIANS APP
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