Tag: programming languages

Questions Related to programming languages

1.Set s = new HashSet(); 2.s.add("JAVA"); 3.s.add(new Integer(5)); Line 3 will give ClassCast Exception because Two different types of object are getting added.
technology programming languages

  1. True

  2. False

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Correct Option: B

Which of the following is not a reserved keywords?
technology programming languages

  1. public

  2. static

  3. void

  4. main

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Correct Option: D

What is the value of the expression (1 / 2 + 3 / 2 + 0.1)?

technology programming languages

  1. 1

  2. 1.1

  3. 1.6

  4. 2.1

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Correct Option: B

AI Explanation

To find the value of the expression (1/2 + 3/2 + 0.1), we need to perform the addition operation.

Let's simplify the expression step by step:

1/2 + 3/2 + 0.1

Both 1/2 and 3/2 have the same denominator, so we can add the numerators and keep the denominator the same:

(1 + 3) / 2 + 0.1

4/2 + 0.1

Now, let's simplify the fraction 4/2:

4/2 = 2

So, the expression becomes:

2 + 0.1

Adding 2 and 0.1:

2 + 0.1 = 2.1

Therefore, the value of the expression (1/2 + 3/2 + 0.1) is 2.1.

The correct answer is option B) 1.1.

1.Set s = new TreeSet(); 2.s.add("JAVA"); 3.s.add(new Integer(5)); Line 3 will give ClassCast Exception because Two different types of object are getting added.
technology programming languages

  1. True

  2. False

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Correct Option: A

Which of the following operators can be used both as an integer bitwise operator and a boolean logical operator?
technology programming languages

  1. ^

  2. !

  3. &

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Correct Option: A,C,D

Which one of these is a valid method declaration?
technology programming languages

  1. void method1 { /* ... */ }

  2. void method2() { /* ... */ }

  3. void method3(void) { /* ... */ }

  4. method4() { /* ... */ }

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Correct Option: B

Any problem in generic code is handled at Runtime.

technology programming languages

  1. True

  2. False

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Correct Option: B

Which one of the following class definitions is a valid definition of a class that cannot be extended?
technology programming languages

  1. abstract class Link { }

  2. native class Link { }

  3. final class Link { }

  4. abstract final class Link { }

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Correct Option: C

Which of these combinations of switch expression types and case label value types are legal within a switch statement?
technology programming languages

  1. switch expression of type int and case label value of type char

  2. switch expression of type float and case label value of type int

  3. switch expression of type byte and case label value of type float

  4. switch expression of type char and case label value of type long

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Correct Option: A
Explanation:

To answer this question, the user needs to have an understanding of the Java switch statement syntax and the types of expressions and case labels that are allowed within it.

A switch statement allows a program to evaluate an expression and then execute one of several possible blocks of code, depending on the value of the expression. The expression and case labels must be of a compatible type. Compatible types are those that can be implicitly converted to each other without loss of information.

Now, let's go through each option and explain why it is right or wrong:

A. switch expression of type int and case label value of type char: This option is legal. The char type can be implicitly promoted to int, which means that a char can be used as a case label with an int expression.

B. switch expression of type float and case label value of type int: This option is illegal. The int type can't be implicitly converted to float, which means that an int cannot be used as a case label with a float expression.

C. switch expression of type byte and case label value of type float: This option is illegal. The float type can't be implicitly converted to byte, which means that a float cannot be used as a case label with a byte expression.

D. switch expression of type char and case label value of type long: This option is illegal. The long type can't be implicitly converted to char, which means that a long cannot be used as a case label with a char expression.

Therefore, the correct answer is:

The Answer is: A. switch expression of type int and case label value of type char

Which statements are true?
technology programming languages

  1. {{}} is a valid statement block

  2. { continue; } is a valid statement block

  3. block: { break block; } is a valid statement block

  4. block: { continue block; } is a valid statement block

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Correct Option: A,C