Operators

Given:

byte b = 1;

char c = 1;

short s = 1;

int i = 1;

which of the following expressions are valid?. Select 3 options.

• s = b * b ;

• i = b + b ;

• s *= b ;

• c = c + b ;

• float f = 2%s+c;

Which of the following statements will compile without any error?. Please select 3 options

• System.out.println("a"+'b'+63);

• System.out.println("a"+63);

• System.out.println('b'+ Integer.valueOf(63));

• String s = 63 + Integer.valueOf(10);

• String valueStr = (String) (63 + Integer.valueof(10));

Consider the following lines of code:

System.out.println(null + true); //1

System.out.println(true + null); //2

System.out.println(null + null); //3

Which of the following statements are correct?. Please select 1 option.

• None of the 3 lines will compile.

• All the 3 lines will compile and print nulltrue, truenull and nullnull respectively.

• Line 1 and 2 won't compile but line 3 will print nullnull.

• Line 3 won't compile but line 1 and 2 will print nulltrue and truenull respectively.

• None of the above.

What will the following code print?

int i1 = 1, i2 = 2, i3 = 3;

float i4 = i1 + (i2=i3 );

System.out.println((int)i4);

Please select 1 option.

• 4

• 4.0

• 4.0f

• It will not compile.

Which of the following operators can be used in conjunction with a String object?. Plese select 3 options

• +

• • + +

• +=

• .

• *

Consider the following lines of code:

boolean greenLight = true;

boolean pedestrian = false;

boolean rightTurn = true;

boolean otherLane = false;

You can go ahead only if the following expression evaluates to 'true' :

(( (rightTurn && !pedestrian || otherLane)

|| ( ? && !pedestrian && greenLight ) ) == true )

What variables can you put in place of '?' so that you can go ahead?

Please select 1 option.

• rightTurn

• otherLane

• Any variable would do.

• None of the variable would allow to go.

What will the following code print?

int i = 0;

int j = 1;

if( (i++ == 0) & (j++ == 2) ){

i = 12;

}

System.out.println(i+" "+j);

Please select 1 option.

• 1 2

• 2 3

• 12 2

• 12 1

• It will not compile.

Which of the following are also known as "short circuiting logical operators"?. Please select 2 options.

• &

• ||

• &&

• |

• ^

What will the following class print ?

class InitTest{

public static void main(String[] args){

int a = 10;

int b = 20;

a += (a = 4);

b = b + (b = 5);

System.out.println(a+ ", "+b);

}

}

Please select 1 option.

• 8, 25

• 4, 5

• 14, 5

• 4, 25

• 14, 25