Set 21

Multiple Choice Question

QID: 
362

Consider the following code:

class A{
public XXX m1(int a){
return a*10/4-30;
}
}class A2 extends A{
public YYY m1(int a){
return a*10/4.0;
}
}

What can be substituted for XXX and YYY so that it can compile without any problems?

Select 1 option

A. int, int
B. int, double
C. double, double
D. double, int
E. Nothing, they are simply not compatible.

Multiple Choice Question

QID: 
361

Consider the following code:

class Super{
static{ System.out.print("super "); }
}class One{
static { System.out.print("one "); }
}class Two extends Super{
static { System.out.print("two "); }
}class Test{
public static void main(String[] args){
One o = null;
Two t = new Two();
}
}

What will be the output when class Test is run ?

Select 1 option

A. It will print one, super and two.
B. It will print one, two and super.
C. It will print super and two.
D. It will print two and super
E. None of the above.

Multiple Choice Question

QID: 
360

Consider the following classes...

class Car{
public int gearRatio = 8;
public String accelerate() { return "Accelerate : Car"; }
}class SportsCar extends Car{
public int gearRatio = 9;
public String accelerate() { return "Accelerate : SportsCar"; }
public static void main(String[] args){
Car c = new SportsCar();
System.out.println( c.gearRatio+" "+c.accelerate() );
}
}

What will be printed when SportsCar is run?

Select 1 option

A. 8 Accelerate : Car
B. 9 Accelerate : Car
C. 8 Accelerate : SportsCar
D. 9 Accelerate : SportsCar
E. None of the above.

Multiple Choice Question

QID: 
359

Given the following code, which statements are true?

class A{
int i;
}class B extends A{
int j;
}

Select 3 options

A. Class B extends class A.
B. Class B is the superclass of class A.
C. Class A inherits from class B.
D. Class B is a subclass of class A.
E. Objects of class B will always have a member variable named i.

Multiple Choice Question

QID: 
358

What will the following code print when TestClass is run?

class Employee {
static int i = 10; {
i = 15;
System.out.print(" Employee "+i);
}
static { System.out.print(" Employee static "+i); }
}
class Manager extends Employee {
static {
i = 45;
System.out.print(" Manager static ");
}{
i = 30;
System.out.print(" Manager "+i);
}
}
class Owner extends Manager{
static { System.out.println("Owner"); }
}
public class TestClass {
public static void main(String[] args) {
Manager m = new Manager();
}
}

Select 1 option

A. Employee static 10 Manager static Employee 10 Manager 30
B. Employee static 10 Manager static Owner Manager 30
C. Employee static 10 Manager static Employee 15 Manager 30
D. Employee static 10 Manager static 15 Manager 20
E. It will not compile.

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