All Flashcards
What are the basic steps to get user input in Java using the Scanner class?
- Import the Scanner class.
- Create a Scanner object.
- Use methods like nextInt(), nextDouble(), or nextLine() to read input.
What are the steps for declaring and initializing a variable in Java?
- Declare the variable with its data type (e.g., int age;).
- Initialize the variable with a value (e.g., age = 15;). Or, combine: int age = 15;
What are the steps to cast a double to an integer in Java?
- Place the target data type (int) in parentheses before the double value or variable.
- Assign the result to an integer variable.
How are primitive data types used in real-world applications?
int: Storing ages, counts, or quantities | double: Storing prices, temperatures, or measurements | boolean: Storing flags, status indicators, or conditions.
How is the Scanner class applied in real-world scenarios?
Taking user input for forms, games, or interactive applications.
How is casting applied in real-world scenarios?
Converting precise measurements to whole numbers for display or storage, or when interfacing with systems that require specific data types.
What are the differences between 'int' and 'double' data types in Java?
int: Stores whole numbers | double: Stores decimal numbers.
What are the differences between integer division and double division?
Integer division: truncates the decimal part | Double division: gives a decimal result.
What are the differences between age++ and age += 1?
age++: post-increment operator, increments after the current operation | age += 1: adds 1 to age.