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- Question
How to define a constant variable in Java?
- Correct Answer
- The variable should be declared as static and final So only one copy of the variable exists for all instances of the class and the value can't be changed also static final int PI = 214; is an example for constant
- 1. Is Java a pure object oriented language? Discuss
- 2. What is difference between Path and Classpath? Discuss
- 3. What is the maximum number of Triggers can be applied in a table ?
Options- A. 8
- B. 9
- C. 12
- D. 14 Discuss
- 4. What is DocumentDB ? Discuss
- 5. Which of the following are elements of SQL?
Options- A. base-table-identifier ::= user-defined-name
- B. base-table-name ::= base-table-identifier
- C. boolean-primary ::= comparison-predicate
- D. All the above Discuss
- 6. What is the access scope of a protected method? Discuss
- 7. What is the impact of declaring a method as final? Discuss
- 8. Which of the following is not used for commenting in java?
Options- A. //
- B. /* */
- C. /** */
- D. /** **/ Discuss
- // is a single line comment
- /* */ is commenting on one or more lines
- /** */ is documentation comment
- 9. Which is true?
Options- A. "X extends Y" is correct if and only if X is a class and Y is an interface
- B. "X extends Y" is correct if and only if X is a class and Y is an interface
- C. "X extends Y" is correct if X and Y are either both classes or both interfaces
- D. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces Discuss
- 10. class Hell { public static void main(String[] args) { Integer i = 42; String s = (i<40)?"life":(i>50)?"base":"ball"; System.out.println(s); } }
Options- A. null
- B. ball
- C. base
- D. None Discuss
Technology problems
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Correct Answer: Java uses primitive data types and hence is not a pure object oriented language
Correct Answer: PATH and CLASSPATH are operating system level environment variables PATH is used to define where the system can find the executables (exe) files whereas CLASSPATH is used to specify the location of class files
Correct Answer: 12
Explanation:
We can apply at max of 12 triggers in a table.
Correct Answer: DocumentDB is a NoSQL document-oriented database and records saves in key-value pairs It's same as the other NoSQL document-oriented such as MongoDB
Correct Answer: All the above
Correct Answer: A protected method can be accessed by the classes within the same package or by the subclasses of the class in any package
Correct Answer: A method declared as final can't be overridden A sub-class can't have the same method signature with a different implementation
Correct Answer: /** **/
Explanation:
Correct Answer: "X extends Y" is correct if X and Y are either both classes or both interfaces
Explanation:
A is incorrect because classes implement interfaces, they don't extend them. B is incorrect because interfaces only "inherit from" other interfaces. D is incorrect based on the preceding rules.
Correct Answer: ball
Explanation:
D is correct. This is a ternary nested in a ternary with a little unboxing thrown in.Both of the ternary expressions are false.
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