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Input & Output
Last Updated: June 5, 2026
Medium Priority
15 min read
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Printing Output with System.out
Formatted Output with printf
Building Strings with String.format
Writing to System.err
Reading Input with Scanner
A Small Interactive Program
The nextInt / nextLine Pitfall
Validating Input Before Reading
Closing the Scanner
Command-Line Arguments
A Faster Alternative for Big Inputs
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Exercise: Input & Ou...
