Educational Technology · Programming Practice

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Classic programmed-learning exercises, refreshed for modern Java and presented in the current MrStyner.com portfolio style.

Java 25 LTS baselineModernized 2026Original URLs preserved

Modern Java noteThis archive has been refreshed for Java 25 LTS. Core language concepts remain useful, while outdated setup instructions and browser-era Java are labeled or replaced. Java 26 is the current feature release; Java 25 is used here as the stable teaching baseline.

Answer:

line.startsWith(str)

could be replaced by

(line.indexOf(str)==0)

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Immutable strings
String Indexing
substring()
indexOf()

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