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Calendar cal = Calendar.getInstance(); cal.setTime(myDate); cal.add(Calendar.DAY_OF_MONTH, 1); Date tomorrow = cal.getTime(); Verbose, mutable, and thread-unsafe. Every project had a DateUtils class copy-pasted from Stack Overflow. Every file operation required a finally block to close streams. Forgetting meant a file handle leak. Your code was littered with:

— A legendary runtime in its time, now a museum piece best admired from a safe distance. If you enjoyed this review, remember: someone somewhere is still System.out.println() -debugging a Java 6 applet in a closed intranet. Pour one out for them. java old version

This pattern caused more NullPointerException s than actual logic errors. Java 6 used Permanent Generation (PermGen) to store class metadata. If you redeployed a web app in Tomcat several times (without a restart), you'd eventually get: java.lang.OutOfMemoryError: PermGen space The only fix? Restart the JVM. This single issue caused countless late-night production rollbacks. (Java 8 replaced it with Metaspace, mostly fixing it.) 4. Collection Verbosity Creating a list of three strings required: Calendar cal = Calendar

Developing a GUI in Java 6 meant hand-coding layouts with GridBagLayout (a masochist's puzzle) or using third-party libraries like JGoodies or NetBeans GUI builder. It worked, but you felt every line of boilerplate. IDEs were heavy. Eclipse 3.2 (Callisto) was popular, but refactoring a large project could take minutes. NetBeans 5.5 was improving. IntelliJ existed but wasn't dominant. Builds used Apache Ant with XML scripts that looked like: Forgetting meant a file handle leak