JAVA Interfaces and Abstract Classes Which of the following is a correct interface? interface A { void print(); } abstract interface A { print(); } interface A { void print() { } } abstract interface A { abstract void print(); { }} interface A { void print(); } abstract interface A { print(); } interface A { void print() { } } abstract interface A { abstract void print(); { }} 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 succeed but Runtime Exception Compilation fails due to an error on lines 2 None of these test-name Compilation fails due to an error on lines 1 Compilation succeed but Runtime Exception Compilation fails due to an error on lines 2 None of these test-name Compilation fails due to an error on lines 1 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Which of the following statements regarding abstract classes are true? An abstract class can be extended. All of these An abstract class can be used as a data type. 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. All of these An abstract class can be used as a data type. A subclass can override a concrete method in a superclass to declare it abstract. A subclass of a non-abstract superclass can be abstract. 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. } null None of these Compilation fails due to an error on line 3 A Compilation fails due to an error on line 8 null None of these Compilation fails due to an error on line 3 A Compilation fails due to an error on line 8 ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes What will happen after compiling this program code?abstract class MyClass{ //line 1 private int a, b; public void call(int a, int b){ this.a = a; this.b = b; System.out.print(a+b); }}public class Test{ public static void main(String args[]){ MyClass m = new MyClass(); //line 2 m.call(12,25); }} Compilation error due to line 1 Runtime error Successful run and print 37 Compilation error due to line 2 None of these Compilation error due to line 1 Runtime error Successful run and print 37 Compilation error due to line 2 None of these ANSWER DOWNLOAD EXAMIANS APP
JAVA Interfaces and Abstract Classes Determine output of the following code.interface A { }class C { }class D extends C { }class B extends D implements A { }public class Test extends Thread{ public static void main(String[] args){ B b = new B(); if (b instanceof A) System.out.println("b is an instance of A"); if (b instanceof C) System.out.println("b is an instance of C"); }} b is an instance of b is an instance of A followed by b is an instance of Nothing. b is an instance of b is an instance of b is an instance of A followed by b is an instance of Nothing. b is an instance of ANSWER DOWNLOAD EXAMIANS APP
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