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Basic Concepts Questions

NA
SHSTTON
47
Solv. Corr.
60
Solv. In. Corr.
107
Attempted
0 M:0 S
Avg. Time

51 / 64

Choose the correct option.

What is the number of bytes used by Java primitive long. Select the one correct answer.


AThe number of bytes is compiler dependent.

B2

C4

D8

E64

Answer: Option D

Explanation:

Number of bytes used by primitive long is 8 bytes. For other data types in java, it is listed below-

TypeSize in BytesRange
byte1 byte-128 to 127
short2 bytes-32,768 to 32,767
int4 bytes-2,147,483,648 to 2,147,483, 647
long8 bytes-9,223,372,036,854,775,808 to 
9,223,372,036,854,775,807
float4 bytesapproximately ±3.40282347E+38F 
(6-7 significant decimal digits) 
Java implements IEEE 754 standard
double8 bytesapproximately ±1.79769313486231570E+308
(15 significant decimal digits)
char2 byte0 to 65,536 (unsigned)
booleannot precisely defined*true or false

Workspace

NA
SHSTTON
28
Solv. Corr.
67
Solv. In. Corr.
95
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Avg. Time

52 / 64

Choose the correct option.

Which of the following is not the function of client?


ACompile queries

BQuery optimization

CReceive query

DResult formatting and presentation

Answer: Option B

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
51
Solv. Corr.
92
Solv. In. Corr.
143
Attempted
0 M:19 S
Avg. Time

53 / 64

What is the output for the below code?
public class Test {
 public static void main(String... args) {
 int x =5;
 x *= 3 + 7;
 System.out.println(x);
 }
 }

A22

B50

C10

DCompilation fails with an error at line 4

Answer: Option B

Explanation:

x *= 3 + 7; is same as x = x * (3 +7) = 5 * (10) = 50 because expression on the right is always placed inside parentheses.

Workspace

NA
SHSTTON
23
Solv. Corr.
76
Solv. In. Corr.
99
Attempted
0 M:0 S
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54 / 64

What is the output for the below code?
public class Test {
enum Month { JAN, FEB, MAR };
public static void main(String... args) {
Month m1 = Month.JAN;
Month m2 = Month.JAN;
Month m3 = Month.FEB;
System.out.println(m1 == m;
System.out.println(m1.equals(m);
System.out.println(m1 == m;
System.out.println(m1.equals(m);
}
}

Atrue true true false

Btrue true false false

Cfalse false true true

DCompilation fails with an error at line 10

Answer: Option B

Explanation:

m1 and m2 refer to the same enum constant So m1 == m2 returns true BUT m1 and m3 refer to different enum constant So m1 == m3 returns false. m1.equals(m returns true because enum constant value is same (JAN and JAN). m1.equals(m return false because enum constants values are different (JAN and FEB).

Workspace

NA
SHSTTON
34
Solv. Corr.
73
Solv. In. Corr.
107
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0 M:0 S
Avg. Time

55 / 64

Choose the correct option.
class A {
class A1 {
void printValue(){
System.out.println("A1");
}
}
}
public class Test{
public static void main (String[] args){
A a = new A();
// INSERT CODE
a1.printValue();
}
}
Which of the below code inserted at line 4, compile and produce the
output "A1"?

AA1 a1 = new A1();

BA.A1 a1 = a.new A1();

CA a1 = new A1();

DAll of the above

Answer: Option A

Explanation:

correct inner class instantiation syntax is A a = new A(); A1 a1 = new A1();

Workspace

NA
SHSTTON
37
Solv. Corr.
54
Solv. In. Corr.
91
Attempted
0 M:0 S
Avg. Time

56 / 64

Choose the correct option.

What is the name of the Collection interface used to represent elements in a sequence (in a particular order). Select the one correct answer.


ACollection

BSet

CList

DMap

Answer: Option C

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
26
Solv. Corr.
53
Solv. In. Corr.
79
Attempted
0 M:0 S
Avg. Time

57 / 64

What is the output for the below code?
public class A {
public void printValue(){
System.out.println("Value-A");
}
}
public class B extends A{
public void printNameB(){
System.out.println("Name-B");
}
}
public class C extends A{
public void printNameC(){
System.out.println("Name-C");
}
}
public class Test{
public static void main (String[] args) {
B b = new B();
C c = new C();
newPrint(b);
newPrint(;
}
public static void newPrint(A {
printValue();
}
}

AValue-A Name-B

BValue-A Value-A

CValue-A Name-C

DName-B Name-C

Answer: Option B

Explanation:

Class B extended Class A therefore all methods of Class A will be available to class B except private methods. Class C extended Class A therefore all methods of Class A will be available to class C except private methods.

Workspace

NA
SHSTTON
70
Solv. Corr.
9
Solv. In. Corr.
79
Attempted
0 M:0 S
Avg. Time

58 / 64

What will be the output of the below program:
public class SwitchTest {
public static void main(String argv[]) {
SwitchTest ms=new SwitchTest();
ms.display();
}
public void display() {
        int k=10;
        switch(k){
            
            default:
            System.out.println("This is the default output");
            break;
            case 10:
            System.out.println("ten");
            break;
            case 20:
            System.out.println("twenty");
            break;
        }
    }
}

Aten

BThis is the default output

Ctwenty

DNone

Answer: Option A

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
24
Solv. Corr.
49
Solv. In. Corr.
73
Attempted
0 M:0 S
Avg. Time

59 / 64

What all gets printed when the following code is compiled and run?
public class xyz {
public static void main(String args[]) {
for(inti = 0; i< 2; i++) {
for(int j = 2; j>= 0; j—) {
if(i == j) break;
System.out.println("i=" + i + " j="+j);
         }
      }
   }
}

A    i=0 j=0

Bi=0 j=1 ,   i=0 j=2 ,  i=1 j=2

C i=0 j=2, i=0 j=3 ,  i=1 j=2

D    i=1 j=2

E    i=2 j=1

Answer: Option B

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
40
Solv. Corr.
45
Solv. In. Corr.
85
Attempted
0 M:0 S
Avg. Time

60 / 64

Choose the correct option.

Which of the following are true. Select the one correct answers.


A&& operator is used for short-circuited logical AND.

B~ operator is the bit-wise XOR operator.

C| operator is used to perform bitwise OR and also short-circuited logical OR.

DThe unsigned right shift operator in Java is >>.

Answer: Option A

Explanation:

Here is no explanation for this answer

Workspace

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