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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!
- 作者:现代数学启蒙
- 链接:https://www.math1234567.com/article/files
- 声明:本文采用 CC BY-NC-SA 4.0 许可协议，转载请注明出处。
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