Core Java 面试题与答案
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问题 26. What is your platform's default character encoding?
If you are running Java on English Windows platforms, it is probably Cp1252. If you are running Java on English Solaris platforms, it is most likely 8859_1.
问题 27. What is the difference amongst JVM Spec, JVM Implementation, JVM Runtime ?
The JVM spec is the blueprint for the JVM generated and owned by Sun. The JVM implementation is the actual implementation of the spec by a vendor and the JVM runtime is the actual running instance of a JVM implementation
问题 28. What is JIT and its use?
Really, just a very fast compiler' In this incarnation, pretty much a one-pass compiler '?? no offline computations. So you can'??t look at the whole method, rank the expressions according to which ones are re-used the most, and then generate code. In theory terms, it'??s an on-line problem.
问题 29. Is JVM a compiler or an interpreter?
Interpreter
问题 30. What is the purpose of assert keyword used in JDK1.4.x?
In order to validate certain expressions. It effectively replaces the if block and automatically throws the AssertionError on failure. This keyword should be used for the critical arguments. Meaning, without that the method does nothing.
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