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programming languages Online Quiz - 192

Description: programming languages Online Quiz - 192
Number of Questions: 20
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Tags: programming languages
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What happens when you compare two primitives of different numerical types?

technology programming languages

  1. compiler error

  2. smaller type is promoted

  3. must explicitly cast

  4. none of the above

Show answer
Correct Option: B

Are you allowed to have more than one top-level(non-inner) class definition per source file?

technology programming languages

  1. True

  2. False

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Correct Option: A

Assume the bit pattern of byte x is: 10110001. What will the sign of x be after x>>2?

technology programming languages

  1. postive

  2. negative

  3. can't be find

  4. none of the above

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Correct Option: B

A class can define two methods with the same name as long as the return types are different

technology programming languages

  1. True

  2. False

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Correct Option: B

All exceptions inherit from

technology programming languages

  1. java.lang.Exception

  2. java.lang.Error

  3. java.lang.Throwable

  4. none of the above

Show answer
Correct Option: C

What happens when you compare two primitives of different numerical types?

technology programming languages

  1. compiler error

  2. smaller type is promoted

  3. must explicitly cast

  4. none of the above

Show answer
Correct Option: B

public static void main(String [] args) { int x = 5; boolean b1 = true; boolean b2 = false; if ((x == 4) && !b2 ) System.out.print("1 "); System.out.print("2 "); if ((b2 = true) && b1 ) System.out.print("3 "); } } What is the result?
technology programming languages

  1. 1,3

  2. 2,3

  3. Compilation Error

  4. Exception

Show answer
Correct Option: B
Explanation:

To solve this question, the user needs to know the basics of boolean expressions and how they work in Java programming. They also need to understand the concept of conditional statements.

Let's go through each option and explain why it is right or wrong:

The code starts by initializing the variable x to 5, and the boolean variables b1 and b2 to true and false, respectively.

The first conditional statement checks if the value of x is equal to 4 and if b2 is false. Since neither condition is true, the code skips the first print statement and moves on to the second one.

The second print statement prints "2" to the console.

The second conditional statement assigns the value true to b2 and then checks if b1 is also true. Since both conditions are true, the code executes the third print statement, printing "3" to the console.

Therefore, the output of the program is:

2 3

So, the correct answer is:

The Answer is: B

interface I{ void f1(); // 1 public void f2(); // 2 protected void f3(); // 3 private void f4(); // 4 } which lines generate compile time errors?

technology programming languages

  1. compiletime error at lines 1,2,3,4

  2. compiletime error at line 3

  3. compiletime error at line 1

  4. compiletime error at lines 3,4

Show answer
Correct Option: D

AI Explanation

To answer this question, let's go through each line to understand if it generates a compile-time error:

1) void f1(); - This line does not generate a compile-time error because the default access modifier for interface methods is public.

2) public void f2(); - This line does not generate a compile-time error because the access modifier public is allowed for interface methods.

3) protected void f3(); - This line generates a compile-time error because the access modifier protected is not allowed for interface methods. Interface methods can only have public access modifier.

4) private void f4(); - This line generates a compile-time error because the access modifier private is not allowed for interface methods. Interface methods can only have public access modifier.

Therefore, the correct answer is option D) compile time error at lines 3,4.

class C1{ public void m1(){ // 1 } } class C2 extends C1{ //2 private void m1(){ } }
technology programming languages

  1. compile time error at line1

  2. compile time error at line2

  3. Run time exception

  4. None Of the above

Show answer
Correct Option: B

class A extends Thread { public void run() { System.out.print("A"); } } class B { public static void main (String[] args) { A a = new A(); a.start(); a.start(); // 1 } }

technology programming languages

  1. Run Time Exception

  2. Compile Error

  3. the code compile and runs fail

  4. None of the above

Show answer
Correct Option: A

What type of inheritance does Java have?

technology programming languages

  1. Single Inheritence

  2. Double Inheritence

  3. Multiple Inheritence

  4. Class Inheritence

Show answer
Correct Option: A

Java runs on.

technology programming languages

  1. Windows

  2. Unix

  3. Solaris

  4. All of the above

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Correct Option: D

The Java interpreter is used for the execution of the source code.

technology programming languages

  1. True

  2. False

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Correct Option: A

A Vector is declared as follows. What happens if the code tried to add 6 th element to this Vector new vector(5,10)
technology programming languages

  1. The element will be successfully added

  2. ArrayIndexOutOfBounds Exception

  3. The Vector allocates space to accommodate up to 15 elements

  4. None of the above

Show answer
Correct Option: A,C

Which is the data structure used to store sorted map elements

technology programming languages

  1. HashSet

  2. Hashmap

  3. Map

  4. TreeMap

Show answer
Correct Option: D

Which of the following is true ?

technology programming languages

  1. Stateless session beans doesn’t preserve any state across method calls

  2. Stateful session beans can be accesses by multiple users at the same time

  3. None of the above

  4. Allof the above

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Correct Option: A

Stateful Session beans contain

technology programming languages

  1. Home Interface

  2. Remote Interface

  3. Bean Class

  4. All of the above

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Correct Option: D

A method is defined in a class as : void processUser(int i) { } If this method is overriden in a sub class,
technology programming languages

  1. the new method should return int

  2. the new method can return any type of values

  3. the argument list of new method should exactly match that of overriden method

  4. the return type of new method should exactly match that of overriden method

Show answer
Correct Option: C,D

What is the output of following piece of code ? int x = 2; switch (x) { case 1:System.out.println(”1?); case 2: case 3:System.out.println(”3?); case 4: case 5:System.out.println(”5?);

technology programming languages

  1. No output

  2. 3 and 5

  3. 1, 3 and 5

  4. 3

Show answer
Correct Option: B

In the init(ServletConfig) method of Servlet life cycle, what method can be used to access the ServletConfig object

technology programming languages

  1. getServletInfo()

  2. getInitParameters()

  3. getServletConfig()

  4. None of the above

Show answer
Correct Option: C
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