EPAM quiz

int x = 0, y = 0 , z = 0 ;

x = (++x + y-- ) * z++;What will be the value of "x" after execution ?

• -2

• -1

• 0

• 1

class Numbers{

public static void main(String args[]){

int a=20, b=10;

if((a < b) && (b++ < 25)){

System.out.println("This is any language logic");

}

System.out.println(b);

}

}

• 12

• 11

• 10

• Compiler error

class LogicalCompare{

public static void main(String args[]){

String str1 = new String("OKAY");

String str2 = new String(str1);

System.out.println(str1 == str2);

}

}

• true

• false

• 0

• 1

class Test{

public void display(int x, double y){

System.out.println(x+y);

}

public double display(int p, double q){

return (p+q);

}

public static void main(String args[]){

Test test = new Test();

test.display(4, 5.0);

System.out.println(test.display(4, 5.0));

}

}

• 9.0 9.0

• 9 9

• Compilation Error

• None of these

interface A{

public void method1();

}

class One implements A{

public void method1(){

System.out.println("Class One method1");

}

}

class Two extends One{

public void method1(){

System.out.println("Class Two method1");

}

}

public class Test extends Two{

public static void main(String[] args){

A a = new Two();

a.method1();

}

}

• Class One method1

• Class Two method1

• Nothing will be printed

• Compilation Error

class Rectangle{

public int area(int length, int width){

return length*width;

}

}

class Square extends Rectangle{

public int area(long length, long width){

return (int) Math.pow(length, 2);

}

}

public class Test{

public static void main(String args[]){

Square r = new Square();

System.out.println(r.area(5 , 4));

}

}

• Will not compile.

• Will compile and run printing out 20

• Runtime error

• Will compile and run printing out 25

What will be the output of the program?

public class CommandArgsThree

{

public static void main(String [] args)

{

String [][] argCopy = new String[2][2];

int x;

argCopy[0] = args;

x = argCopy[0].length;

for (int y = 0; y < x; y++)

{

System.out.print(" " + argCopy[0][y]);

}

}

}

and the command-line invocation is

> java CommandArgsThree 1 2 3

• 0 0

• 1 2

• 0 0 0

• 1 2 3

What will be the output of the program ?

public class Test

{

public static void main(String [] args)

{

signed int x = 10;

for (int y=0; y<5; y++, x--)

System.out.print(x + ", ");

}

}

• 10, 9, 8, 7, 6,

• 9, 8, 7, 6, 5,

• Compilation fails.

• An exception is thrown at runtime.

Which one of these lists contains only Java programming language keywords?

• class, if, void, long, Int, continue

• goto, instanceof, native, finally, default, throws

• try, virtual, throw, final, volatile, transient

• strictfp, constant, super, implements, do

class HappyGarbage01

{

public static void main(String args[])

{

HappyGarbage01 h = new HappyGarbage01();

h.methodA(); /* Line 6 */

}

Object methodA()

{

Object obj1 = new Object();

Object [] obj2 = new Object[1];

obj2[0] = obj1;

obj1 = null;

return obj2[0];

}

}

Where will be the most chance of the garbage collector being invoked?

• After line 9

• After line 10

• After line 11

• Garbage collector never invoked in methodA()