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 1 and 3 2 and 4 1 and 2 3 and 4 2 and 3 1 and 3 2 and 4 1 and 2 3 and 4 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 abstract void method() {} public abstract method(); public void abstract Method(); public void method() {} public abstract void method(); public abstract void method() {} public abstract method(); public void abstract Method(); public void method() {} 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()); }} Compilation fails due to an error on lines 1 test-name Compilation fails due to an error on lines 2 None of these Compilation succeed but Runtime Exception Compilation fails due to an error on lines 1 test-name Compilation fails due to an error on lines 2 None of these Compilation succeed but Runtime Exception ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Which of the following is a correct interface? interface A { void print() { } } interface A { void print(); } abstract interface A { abstract void print(); { }} abstract interface A { print(); } interface A { void print() { } } interface A { void print(); } abstract interface A { abstract void print(); { }} abstract interface A { print(); } 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();}} Compilation Error compiles fine but print nothing None of these will print Class Two method will print Class One method Compilation Error compiles fine but print nothing None of these will print Class Two method will print Class One method ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Runnable is a _____ . class vaiable abstract class method interface class vaiable abstract class method interface ANSWER DOWNLOAD EXAMIANS APP
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