Questions and answers for exam Preparation

MCQs

Total Questions : 45 | Page 3 of 5 pages

Question 21. What is the output for the below code?
public class Test{
int _$;
int $7;
int do;
public static void main(String argv[]){
Test test = new Test();
test.$7=7;
test.do=9;
System.out.println(test.$7);
System.out.println(test.do);
System.out.println(test._$);
}
}

7 9 0
7 0 0
Compile error - $7 is not valid identifier.
Compile error - do is not valid identifier.
None of these

Discuss Question

Answer: Option D. -> Compile error - do is not valid identifier.

Question 22. What is the output for the below code ?
1. public class Test{
2. public static void main(String[] args){
3. int i = 010;
4. int j = 07;
5. System.out.println(i);
6. System.out.println(j);
7. }
8. }

8 7
10 7
Compilation fails with an error at line 3
Compilation fails with an error at line 5
None of these

Discuss Question

Answer: Option A. -> 8 7

Question 23. What will be the output for the below code ?
1. public class Test{
2. public static void main(String[] args){
3. byte i = 128;
4. System.out.println(i);
5. }
6. }

128
0
Compilation fails with an error at line 3
Compilation fails with an error at line 4
None of these

Discuss Question

Answer: Option C. -> Compilation fails with an error at line 3

Question 24. What is the output for the below code ?
1. public class Test{
2. public static void main(String[] args){
3. byte b = 6;
4. b+=8;
5. System.out.println(b);
6. b = b+7;
7. System.out.println(b);
8. }
9. }

14 21
14 13
Compilation fails with an error at line 6
Compilation fails with an error at line 4
None of these

Discuss Question

Answer: Option C. -> Compilation fails with an error at line 6

Question 25. What will be the output for the below code ?
1. public class Test{
2. int i=8;
3. int j=9;
4. public static void main(String[] args){
5. add();
6. }
7. public static void add(){
8. int k = i+j;
9. System.out.println(k);
10. }
11. }

17
0
Compilation fails with an error at line 5
Compilation fails with an error at line 8
None of these

Discuss Question

Answer: Option D. -> Compilation fails with an error at line 8

Question 26. What will be output of following program?
public class Test{
public static void main(String[] args){
byte b=127;
b++;
b++;
System.out.println(b);
}
}

2
129
-127
Compiler error
None of these

Discuss Question

Answer: Option C. -> -127

Question 27. Determine output:
public class Test{
int a = 10;
public void method(int a){
a += 1;
System.out.println(++a);
}
public static void main(String args[]){
Test t = new Test();
t.method(3);
}
}

4
5
12
11
None of these

Discuss Question

Answer: Option B. -> 5

Question 28.

What is the output of this program?

class area {
public static void main(String args[])
{
double r, pi, a;
r = 9.8;
pi = 3.14;
a = pi * r * r;
System.out.println(a);
}
}

301.5656
301
301.56
301.56560000

Discuss Question

Answer: Option A. -> 301.5656

None.
output:
$ javac area.java
$ java area
301.5656

Question 29.

What is the output of this program?

class increment {
public static void main(String args[])
{
int g = 3;
System.out.print(++g * 8);
}
}

Discuss Question

Answer: Option C. -> 32

Operator ++ has more preference than *, thus g becomes 4 and when multiplied by 8 gives 32.
output:
$ javac increment.java
$ java increment
32

Question 30.

What is the output of this program?

class conversion {
public static void main(String args[])
{
double a = 295.04;
int b = 300;
byte c = (byte) a;
byte d = (byte) b;
System.out.println(c + " " + d);
}
}