JAVA CONSTRUCTORS AND METHODS QUIZ

Which of the following statements regarding static methods are correct?1. Static methods are difficult to maintain, because you can not change their implementation.2. Static methods can be called using an object reference to an object of the class in which this method is defined.3. Static methods are always public, because they are defined at class-level.4. Static methods do not have direct access to non-static methods which are defined inside the same class.

1 and 2

1 and 3

3 and 4

2 and 4

TRUE ANSWER : ?
YOUR ANSWER : ?

public class Test { }What is the prototype of the default constructor?

Test(void)

None of these

Test( )

public Test(void)

public Test( )

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the output for the below code?public class Test{ public static void printValue(int i, int j, int k){ System.out.println("int"); } public static void printValue(byte...b){ System.out.println("long"); } public static void main(String... args){ byte b = 9; printValue(b,b,b); }}

Compilation clean but throws RuntimeException

None of these

int

long

Compilation fails

TRUE ANSWER : ?
YOUR ANSWER : ?

class MyClass{int i;int j;public MyClass(int i, int j){this.i = i;this.j = j;}public void call(){System.out.print("One");}}public class Test{public static void main(String args[]){MyClass m = new MyClass(); //line 1m.call(); //line 2}}

Compilation succeed but no output.

Compilation fails due to an error on line 2

Compilation fails due to an error on line 1

One

TRUE ANSWER : ?
YOUR ANSWER : ?

class MyClass{ MyClass(){ System.out.print("one"); } public void myMethod(){ this(); System.out.print("two"); }} public class TestClass{ public static void main(String args[]){ MyClass obj = new MyClass(); obj.myMethod(); }}

one one two

None of these

Compilation Error

two one one

one Exception

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the output of the above program ?class Num { Num(double x ){ System.out.println( x ) ; } }public class Test extends Num { public static void main(String[] args){ Num num = new Num( 2 ) ; } }

Compile time error

0

2.0

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

What will be the result of compiling and running the given code?class A{ int b=10; private A(){ this.b=7; } int f(){ return b; }}class B extends A{ int b;}public class Test{ public static void main(String[] args){ A a = new B(); System.out.println(a.f()); }}

Prints 0

None of these

Prints 10

Prints 7

Compilation Fails

TRUE ANSWER : ?
YOUR ANSWER : ?

What is Math.floor(3.6)?

4

3.0

4.0

3

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the expected output?public class Profile { private Profile(int w) { // line 1 System.out.print(w); } public static Profile() { // line 5 System.out.print (10); } public static void main(String args[]) { Profile obj = new Profile(50); }}

10 50

50

Won't compile because of line (1), constructor can't be private

Won't compile because of line (5), constructor can't be static

TRUE ANSWER : ?
YOUR ANSWER : ?

public class MyClass{ }For the above class(MyClass) what is the correct way of declaring constructor?

public MyClass(){}

MyClass(void) {}

1 and 3

public MyClass(void){}

MyClass(){}

TRUE ANSWER : ?
YOUR ANSWER : ?

↑