fundamental of java programming coursera week 2 quiz answers
Variables and Data Types - Practice Quiz
1. What is the purpose of using packages in Java?
- To organize and group related classes and interfaces.
- To define variables and methods.
- To create objects.
- To specify the visibility of classes and interfaces.
2. Which of the following is the correct syntax for defining a package in Java?
- package MyPackage;
- define MyPackage;
- pkg MyPackage;
- package MyPackage { }
3. Which of the following is NOT a type of comment in Java?
- // Single-line comment
- /* Multi-line comment /
- <!– HTML comment –>
- /** Javadoc comment /
4. What is the purpose of clean code design in Java?
- To make the code look visually appealing.
- To reduce the size of the compiled code.
- To improve the performance of the code.
- To write code that is easy to understand, maintain, and extend.
5. What is the basic structure of a Java program?
- Package declaration, import statements, class definition, main method
- Class definition, package declaration, importstatements, main method
- Main method, package declaration, import statements, class definition
- Import statements, class definition, main method, package declaration
Operators - Practice Quiz
6. What are the primitive data types in Java?
- int, float, boolean, char
- String, double, boolean, byte
- Integer, float, boolean, char
- int, double, Boolean, char
7. What is type casting in Java?
- Converting a reference data type to a primitive data type.
- Converting a primitive data type to a reference data type.
- Converting a value of one data type to another data type.
- Converting a boolean data type to an integer data type.
8. What is the purpose of the "final" keyword in Java?
- It indicates that a class cannot be inherited.
- It indicates that a variable cannot be changed after initialization.
- It indicates that a method cannot be overridden in a subclass.
- All of the above.
9. What is a static variable in Java?
- A variable that can be accessed only within the same class.
- A variable that can be accessed only within the same method.
- A variable that can be accessed from any class in the same package.
- A variable that is shared among all instances of a class.
10. How do you take user input in Java?
- By using the System.out.println() method.
- By using the Scanner class.
- By using the BufferedReader class.
- By using the BufferedReader class.
Array & String - Practice Quiz
12. What is the purpose of conditional operators in Java?
- To perform arithmetic operations.
- To evaluate conditions and produce boolean results.
- To perform bitwise operations.
- To perform type casting.
14. What is the purpose of bitwise operators in Java?
- To perform arithmetic operations.
- To evaluate conditions and produce boolean results.
- To perform logical operations.
- To perform operations on individual bits of integers.
15. What is the purpose of the arithmetic operators in Java?
- To perform operations on individual bits of integers.
- To evaluate conditions and produce boolean results.
- To perform logical operations.
- To perform basic arithmetic operations such as addition, subtraction, multiplication, and division.
Core Java - Graded Quiz
16. Which of the following is a control flow statement in Java?
- int
- switch
- String
- System.out.println()
17. What is the purpose of the ternary operator in Java?
- To perform loops.
- To perform arithmetic operations.
- To evaluate conditions and produce results based on the outcome of the condition.
- To declare variables.
19. What is the purpose of the break statement in Java?
- To end the program execution.
- To skip the current iteration of a loop and move to the next iteration.
- To continue to the next iteration of a loop.
- To exit a loop or switch statement before its normal completion.
20. What is the purpose of the continue statement in Java?
- To end the program execution.
- To skip the next iteration of a loop and move to the iteration after the next.
- To exit a loop or switch statement before its normal completion.
- To skip the current iteration of a loop and move to the next iteration.
21. What is the purpose of the exit statement in Java?
- To skip the current iteration of a loop and move to the next iteration.
- To end the program execution.
- To exit a loop or switch statement before its normal completion.
- There is no exit statement in Java.
22. Which of the following is a valid use of the switch statement in Java?
- Switching on a boolean variable.
- Switching on a float variable.
- Switching on a String variable.
- Switching on an object reference variable.
23. What is the purpose of the for loop in Java?
- To declare variables.
- To perform arithmetic operations.
- To perform conditional branching.
- To repeatedly execute a block of code based on a condition.
24. What is the purpose of the while loop in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To repeatedly execute a block of code based on a condition.
- To declare variables.
25. What is the purpose of the for-each loop in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To declare variables.
- To iterate over elements of an array or a collection.
26. What is the purpose of the break statement in Java?
- To terminate the program execution.
- To skip the current iteration of a loop and move to the next iteration.
- To continue with the next iteration of a loop.
- To resume execution after the end of a loop.
27. What is the purpose of the continue statement in Java?
- To terminate the program execution.
- To skip the current iteration of a loop and move to the next iteration.
- To exit a loop or switch statement before its normal completion.
- To resume execution after the end of a loop.
28. What is the purpose of the ternary operator in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To declare variables.
- To iterate over elements of an array or a collection.
29. What is the purpose of the control flow statements in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To declare variables.
- To iterate over elements of an array or a collection.
30. What is the purpose of the switch case statement in Java?.
- To perform arithmetic operations.
- To perform conditional branching.
- To declare variables.
- To iterate over elements of an array or a collection.
31. What is the purpose of the for loop in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To iterate over a collection of elements a specific number of times.
- To declare variables.
32. What is the purpose of the while loop in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To iterate over a collection of elements as long as a condition is true.
- To declare variables.
33. What is the purpose of the for-each loop in Java?
- To perform arithmetic operations.
- To perform conditional branching.
- To iterate over elements of an array or a collection.
- To declare variables.
34. What is the purpose of the break statement in Java?
- To terminate the program execution.
- To skip the current iteration of a loop and move to the next iteration.
- To exit a loop or switch statement before its normal completion.
- To resume execution after the end of a loop.
35. What is the purpose of the continue statement in Java?
- To terminate the program execution.
- To skip the current iteration of a loop and move to the next iteration.
- To exit a loop or switch statement before its normal completion.
- To resume execution after the end of a loop.