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The evolution of the Java programming language has been managed carefully (maybe too carefully) to avoid incompatible language changes. However, binary compatibility was given more consideration than source compatibility. In the words of one of the Java Posses, your class will continue to work as long as you don't recompile your code.

Q: Which of the following Sun JDK/JSDK/J2SDK/JDK upgrades contain code breaking language/library changes? Give an example snippet.

• Beta ⇒ 1.0
• 1.0 ⇒ 1.1
• 1.1 ⇒ 1.2
• 1.2 ⇒ 1.3
• 1.3 ⇒ 1.4
• 1.4 ⇒ 1.5
• 1.5 ⇒ 1.6