Core Java MCQ

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Core Java Mastery Quiz

Test your knowledge of Core Java with this comprehensive quiz designed to challenge both beginners and experienced programmers. With 11 multiple-choice questions, this quiz covers a range of topics including access modifiers, object-oriented principles, and Java syntax.

Participate and see how well you know Java! Here are some features of our quiz:

Covering essential Java concepts
Instant feedback on your answers
Perfect for studying or brushing up on skills

11 Questions3 MinutesCreated by CodingLion237

Which of the following are Java reserved words?

run
import
default
implement

1 and 2

2 and 3

3 and 4

2 and 4

What is the most restrictive access modifier that will allow members of one class to have access to members of another class in the same package?

Public

Abstract

Protacted

Default

What will be the output of the program?

int x = 3; 
int y = 1; 
if (x = y) /* Line 3 */
{
    System.out.println("x =" + x); 
}

X =3

X = 1

Compilation Error

Code runs with no output

int x = l, y = 6; 
while (y--) 
{
    x++; 
} 
System.out.println("x = " + x +" y = " + y);

X=6 , y =0

X=7 , y=0

X=6 , y =-1

Compilation fails

What will be the output of the program?

String d = "bookkeeper";
d.substring(1,7);
d = "w" + d;
d.append("woo");  /* Line 4 */
System.out.println(d);

Wookkeewoo

Wbookkeeper

Wbookkeewoo

Compilation fails

public void test(int x) 
{ 
    int odd = 1; 
    if(odd) /* Line 4 */
    {
        System.out.println("odd"); 
    } 
    else 
    {
        System.out.println("even"); 
    } 
}

Compilation fails.

"odd" will always be output.

"even" will always be output.

"odd" will be output for odd values of x, and "even" for even values.

class Test 
{  
    private Demo d; 
    void start() 
    {  
        d = new Demo(); 
        this.takeDemo(d); /* Line 7 */
    } /* Line 8 */
    void takeDemo(Demo demo) 
    { 
        demo = null;  
        demo = new Demo(); 
    } 
}

When is the Demo object eligible for garbage collection?

After line 7

After line 8

After the start() method completes

When the instance running this code is made eligible for garbage collection.

interface DoMath 
{
    double getArea(int rad); 
}
interface MathPlus 
{
    double getVol(int b, int h); 
}
/* Missing Statements ? */

which two code fragments inserted at end of the program, will allow to compile?

class AllMath extends DoMath { double getArea(int r); }
interface AllMath implements MathPlus { double getVol(int x, int y); }
interface AllMath extends DoMath { float getAvg(int h, int l); }
class AllMath implements MathPlus { double getArea(int rad); }
abstract class AllMath implements DoMath, MathPlus { public double getArea(int rad) { return rad * rad * 3.14; } }

1 only

2 only

3 and 5

1 and 4

What will be the output of the program?

class Test 
{
    public static void main(String [] args) 
    {
        int x=20;
        String sup = (x < 15) ? "small" : (x < 22)? "tiny" : "huge";
        System.out.println(sup);
    }
}

Small

Tiny

Huge

Compilation fails

public class Test 
{
    public static void main(String [] args) 
    {
        int I = 1;
        do while ( I < 1 )
        System.out.print("I is " + I);
        while ( I > 1 ) ;
    }
}

I is 1

I is 1 I is 1

No output is produced.

Compilation error

What is Your Name?

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