Data Types and Variables -Java Programming MCQ Questions and Answers

61

What is the range of short data type in Java?

A) -128 to 127 B) -32768 to 32767 C) -2147483648 to 2147483647 D) None of the mentioned

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Answer & Solution

Answer: Option B

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62

Is SimpleDateFormat thread safe?

A) True B) False

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Answer & Solution

Answer: Option B

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63

Which of these can not be used for a variable name in Java?

A) identifier B) keyword C) identifier & keyword D) none of the mentioned

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Answer & Solution

Answer: Option B

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64

Are enums are type-safe?

A) True B) False

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Answer & Solution

Answer: Option A

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65

Which of the below data type doesn't support overloaded methods for +,-,* and /?

A) int B) float C) double D) BigDecimal

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Answer & Solution

Answer: Option D

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66

How to convert a String to a Date object?

A)

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
sdf.parse(new Date());

B)

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
sdf.format(new Date());

C)

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
new Date().parse();

D)

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
new Date().format();

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Answer & Solution

Answer: Option A

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67

What is BigDecimal.ONE?

A) wrong statement B) custom defined statement C) static variable with value 1 on scale 10 D) static variable with value 1 on scale 0

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Answer & Solution

Answer: Option D

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68

What will be the error in the following Java code?

byte b = 50;
b = b * 50;

A) b cannot contain value 100, limited by its range B) * operator has converted b * 50 into int, which can not be converted to byte without casting C) b cannot contain value 50 D) No error in this code

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Answer & Solution

Answer: Option B

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69

Which of these values can a boolean variable contain?

A) True & False B) 0 & 1 C) Any integer value D) true

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Answer & Solution

Answer: Option A

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70

What will be the output of the following Java code?

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

A) 25 B) 24 C) 32 D) 33

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Answer & Solution

Answer: Option C

Solution:

The given Java code initializes a variable g with the value 3. It then uses the pre-increment operator (++) on g before multiplying it by 8 and printing the result using System.out.print.

The expression ++g * 8 is evaluated as follows:

++g increments the value of g to 4.
4 * 8 is equal to 32.
Therefore, the output of the code will be 32.