To determine the output of the given code, let's go through each line step by step:

String s1 = "Java";
String s2 = "Java";
String s3 = new String("Java");
String s4 = new String("Java");

In the above code, s1 and s2 are string literals, while s3 and s4 are objects created using the new keyword.

if(s1 == s2)
    System.out.print("true");
else
    System.out.println("false");

Here, s1 and s2 are both string literals, and they refer to the same object in the string pool. So, the condition s1 == s2 is true, and "true" is printed.

if(s3 == s4)
    System.out.print("true");
else
    System.out.println("false");

In this case, s3 and s4 are two different objects created using the new keyword, so the condition s3 == s4 is false, and "false" is printed.

if(s1 == s3)
    System.out.print("true");
else
    System.out.println("false");

Here, s1 is a string literal and s3 is an object created using the new keyword. They are not the same object, so the condition s1 == s3 is false, and "false" is printed.

if(s2 == s3.intern())
    System.out.print("true");
else
    System.out.println("false");

The intern() method returns the canonical representation of a string object from the string pool. In this case, s3 is interned and refers to the same object as s2. So, the condition s2 == s3.intern() is true, and "true" is printed.

if(s3.intern() == s2.intern())
    System.out.print("true");
else
    System.out.println("false");

Since both s3 and s2 are interned and refer to the same object in the string pool, the condition s3.intern() == s2.intern() is true, and "true" is printed.

Therefore, the output of the given code is:

B. true false false true true

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) 1 and 4 - This option is correct because both -5+5 and "0.00" + 0 can be evaluated to produce a valid result. -5+5 equals 0, and "0.00" + 0 equals "0.00" (a string concatenation).

Option B) 2 and 4 - This option is incorrect because the expression " " is an empty string and cannot be evaluated to produce a valid result. Therefore, option 2 is incorrect.

Option C) 3 and 1 - This option is incorrect because the expression 0X0 is not a valid mathematical expression. It appears to be a typo or incorrect format for multiplication. Therefore, option 3 is incorrect.

Option D) 2 and 3 - This option is incorrect because, as explained earlier, the expression " " is an empty string and cannot be evaluated to produce a valid result. Therefore, option 2 is incorrect.

The correct answer is option A. This option is correct because both -5+5 and "0.00" + 0 can be evaluated to produce valid results.

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• Wrong explanation

To answer this question, you need to understand the different ways of sharing data between servlets in a distributed web application.

Option A) Attributes of ServletContext - This option is incorrect because ServletContext attributes can be used to share data between servlets in a distributed web application. ServletContext is a global object that is accessible to all servlets running within the same web application.

Option B) Enterprise Java Beans (EJB) - This option is incorrect because EJBs can be used to share data between servlets in a distributed web application. EJBs are a server-side component model in Java EE that provides a way to write reusable and scalable business logic.

Option C) Attributes of HttpSession - This option is incorrect because HttpSession attributes can be used to share data between servlets in a distributed web application. HttpSession is an object that represents a user session and can store data that is specific to that session.

Option D) Database - This option is incorrect because a database can be used to share data between servlets in a distributed web application. Servlets can store and retrieve data from a database to share information between different components of the application.

The correct answer is A) Attributes of ServletContext. This option is incorrect because ServletContext attributes can be used to share data between servlets in a distributed web application.

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• Wrong explanation