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- Question
What are instance variables?
- Correct Answer
- Instance variables are those which are defined at the class level Instance variables need not be initialized before using them as they are automatically initialized to their default values
- 1. What do you mean by platform independence? Discuss
- 2. What is the difference between a JDK and a JVM? Discuss
- 3. What is the most important feature of Java? Discuss
- 4. A data warehouse is composed of
Options- A. current data
- B. internal and external data sources
- C. historical data from legacy systems
- D. historical & current data Discuss
- 5. What is a shared pool? Discuss
- 6. Does Java support multiple inheritance? Discuss
- 7. Are arrays primitive data types? Discuss
- 8. Why is the main() method declared static? Discuss
- 9. What is the return type of the main() method? Discuss
- 10. What is the argument of main() method? Discuss
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Correct Answer: Platform independence means that we can write and compile the java code in one platform (Eg Windows) and can execute the class in any other supported platform (Eg Linux,Solaris,etc)
Correct Answer: JDK is Java Development Kit which is for development purpose and it includes execution environment also JVM is Java Virtual Machine which is a run time environment for the compiled java class files Hence you will not be able to compile your source files using a JVM
Correct Answer: Java is a platform independent language
Correct Answer: historical data from legacy systems
Explanation:
A data warehouse is a relational database that is designed for query and analysis rather than transaction processing. It usually contains historical data that is derived from transaction data, but it can include data from other sources. Data warehouses are designed to help you analyze your data.
Correct Answer: Shared pool in oracle contains cache information that collects, parses, interprets and executes SQL statements that goes against database This shared pool acts like a buffer for these SQL statements
Correct Answer: Java doesn't support multiple inheritance
Correct Answer: In Java, Arrays are objects
Correct Answer: main() method is called by the JVM even before the instantiation of the class, hence it is declared as static
Correct Answer: Main() method doesn't return anything hence declared void
Correct Answer: main() method accepts an array of String object as arguement
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