Scanner vs. BufferedReader: When Should You Choose Which for Optimal Performance?

Scanner vs. BufferedReader: Performance and Use Cases

Character-based data retrieval in Java is often achieved through Scanner or BufferedReader. While both methods read text files, they differ in their approach and capabilities.

Scanner vs. BufferedReader Performance

Does Scanner perform as well as BufferedReader?

No. BufferedReader utilizes a buffer for efficient file reading, avoiding repeated disk operations. This optimization makes it more efficient for handling large files. Scanner does not employ a buffer, resulting in slower performance for voluminous data.

Choosing Scanner vs. BufferedReader

When should you choose Scanner over BufferedReader, and vice versa?

Consider Scanner when:

• Parsing specific data structures, such as timestamps or numerical values.
• Reading input from individual lines, not requiring precise character manipulation.

Consider BufferedReader when:

• Performance is crucial for handling large files.
• Detailed character manipulation or line-by-line processing is necessary.
• You want to manually control buffering and use custom character parsing logic.

Additionally, BufferedReader can be paired with Scanner to improve performance. By passing a BufferedReader as the Scanner's source of characters, you benefit from the BufferedReader's efficiency while utilizing Scanner's parsing capabilities.

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