# Set 13

## Multiple Choice Question

QID:
322

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?

Select 1 option

A. None of the 3 lines will compile.
B. All the 3 line will compile and print null true, true null and null null respectively.
C. Line 1 and 2 won't compile but line 3 will print null null.
D. Line 3 won't compile but line 1 and 2 will print null true and true null respectively.
E. None of the above.

## Multiple Choice Question

QID:
321

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 &amp;&amp; !pedestrian || otherLane) || ( ? &amp;&amp; !pedestrian &amp;&amp;
greenLight ) )  == true )``````

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

Select 1 option

A. rightTurn
B. otherLane
C. Any variable would do.
D. None of the variable would allow to go.

## Multiple Choice Question

QID:
320

Which line in the following code will cause the compilation to fail?

``````public class TestClass {

public static void main(String[] args) throws Exception {
work();                  //LINE 10
int j = j1;               //LINE 11
int j1 = (double) x; //LINE 12
}

public static void work() throws Exception{
System.out.println(x); //LINE 15
}
static double x;    //19
}``````

Select 1 option

A. Line 10
B. Line 11
C. Line 12
D. Line 15
E. Line 19

## Descriptive Question

QID:
319

Drag and Drop valid operators in boxes.
= operator can be used more than once.
=        +=        *=
public class TestClass
{
public static void main(String[] args)
{
Short k = 9;
Integer I =9;
Boolean b = false;
char c = ‘a’;
String str = “123”;

## Multiple Choice Question

QID:
318

Given:

byte b = 1;
char c = 1;
short s = 1;
int i = 1;

which of the following expressions are valid?

Select 3 options

A. s = b * b ;
B. i = b << b ;
C. s <<= b ;
D. c = c + b ;
E. s += i ;

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