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Here’s an explanation of Essential Knowledge 4.6.A with 10 concrete examples demonstrating file handling in Java using the File and Scanner classes. These examples progressively cover concepts from opening and reading files to handling exceptions and using loop and string operations effectively.

Example 1: Creating a File Object

Explanation: This creates a File object connected to a file named data.txt.

Example 2: Reading Integers from a File

Explanation: Uses Scanner(File f) and nextInt() to read an integer from the file.

Example 3: Using nextLine() and next()

Explanation: Demonstrates the difference between next() and nextLine().

Example 4: Handling Missing File with throws IOException

Explanation: Shows need for throws IOException to handle file-not-found error.

Example 5: Loop Through a File with hasNext()

Explanation: Uses while loop with hasNext() to read all items from a file.

Example 6: Reading Doubles from a File

Explanation: Uses nextDouble() to read double values, and handles precision.

Example 7: Boolean Input from File

Explanation: Demonstrates reading boolean values using nextBoolean().

Example 8: Splitting Lines with split()

Explanation: Splits a CSV-style line into an array of substrings.

Example 9: Always Close the File

Explanation: Reinforces best practice to always call close() on Scanner.

Example 10: Full Program with Try-Catch

Explanation: Uses try-catch instead of throws to handle file exceptions gracefully.

Let me know if you’d like these examples in PDF format or want quiz questions based on them!
Application Program Interface (API)Wrapper classes
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