Tag: web technology

Questions Related to web technology

How to clear the JVM logs in server?

technology web technology

  1. By sending a mail to websphere_test team

  2. By submitting a work request to WDT team

  3. Either a or b

  4. None of the above

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Correct Option: B

Log which helps to see the errors raised only during the particular date and time

technology web technology

  1. EML viewer

  2. Logs in wasops

  3. Both a and b

  4. None of the above

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Correct Option: A

In MVC Architecture, the significance of Model is ______.

technology web technology

  1. Business Logic

  2. UI

  3. Control Logic

  4. None of the above

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Correct Option: A

MVC architecture is used commonly because

technology web technology

  1. The addition, editing, and removal of interfaces is simple

  2. Changes made to the logic control are easy

  3. Helps developers avoid repeating common code

  4. All of the above

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Correct Option: D

Struts is based on MVC framework

technology web technology

  1. True

  2. False

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Correct Option: B

Boolean values can be cast into any other primitive type.

technology web technology

  1. True

  2. False

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Correct Option: B

The logs for the server can be viewed through
technology web technology

  1. EML viewer

  2. Logs in wasops

  3. Both a and b

  4. None of the above

Show answer
Correct Option: C

What is the output of the following StringBuffer sb1 = new StringBuffer("Amit"); StringBuffer sb2= new StringBuffer("Amit"); String ss1 = "Amit"; System.out.println(sb1==sb2); System.out.println(sb1.equals(sb2)); System.out.println(sb1.equals(ss1)); System.out.println("Poddar".substring(3));

technology web technology

  1. false false false dar

  2. false true false Poddar

  3. Compiler Error

  4. true true false dar

Show answer
Correct Option: A

AI Explanation

To answer this question, let's go through each option one by one:

Option A) false false false dar - This option is incorrect. The output of the given code is not "false false false dar".

Option B) false true false Poddar - This option is incorrect. The output of the given code is not "false true false Poddar".

Option C) Compiler Error - This option is incorrect. There is no compiler error in the given code.

Option D) true true false dar - This option is incorrect. The output of the given code is not "true true false dar".

Now, let's analyze the code step by step:

StringBuffer sb1 = new StringBuffer("Amit");
StringBuffer sb2 = new StringBuffer("Amit");
String ss1 = "Amit";
System.out.println(sb1 == sb2);
System.out.println(sb1.equals(sb2));
System.out.println(sb1.equals(ss1));
System.out.println("Poddar".substring(3));

In the given code, sb1 and sb2 are StringBuffer objects with the value "Amit", and ss1 is a String object with the value "Amit".

  1. System.out.println(sb1 == sb2); - This statement compares the references of sb1 and sb2. Since they are two separate StringBuffer objects, the result is false.

  2. System.out.println(sb1.equals(sb2)); - This statement compares the contents of sb1 and sb2. The equals() method in the StringBuffer class is not overridden to compare the contents, so it compares the references. Since sb1 and sb2 are two separate objects, the result is false.

  3. System.out.println(sb1.equals(ss1)); - This statement compares the contents of sb1 and ss1. The equals() method in the StringBuffer class is not overridden to compare the contents, so it compares the references. Since sb1 is a StringBuffer object and ss1 is a String object, the result is false.

  4. System.out.println("Poddar".substring(3)); - This statement returns a substring of the string "Poddar" starting from index 3. The substring is "dar".

Therefore, the correct answer is option A) false false false dar.

When a string literal is used in the program, Java automatically creates instances of the string class.

technology web technology

  1. True

  2. False

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Correct Option: B

Which of the following are primitive types?

technology web technology

  1. byte

  2. String

  3. integer

  4. Float

Show answer
Correct Option: A

AI Explanation

To answer this question, you need to understand the concept of primitive types in programming.

Primitive types are basic data types that are built into a programming language and are not composed of other types. They are typically used to represent simple values.

Let's go through each option to understand why it is correct or incorrect:

Option A) byte - This option is correct because byte is a primitive type in many programming languages, including Java. It represents an 8-bit signed integer.

Option B) String - This option is incorrect because String is not a primitive type. It is a class in Java and other programming languages, used to represent a sequence of characters.

Option C) integer - This option is incorrect because "integer" is not a specific primitive type. However, if it refers to the "int" type, then it is correct. "int" is a primitive type in Java, representing a 32-bit signed integer.

Option D) Float - This option is incorrect because "Float" is not a primitive type. It is a class in Java and other programming languages, used to represent a single-precision floating-point number. The primitive type for floating-point numbers is "float".

The correct answer is Option A) byte. This option is correct because byte is a primitive type.