Today, the sharing of knowledge must be mastered the core technology of Java with you.
1 Java core technology
The main contents of this presentation is part of J2SE and related, in addition, will re-introduce some of the relevant J2EE, and Java-related contents of each frame in the future.
After so many years of Java development, as well as some experience combined with the usual interview Java developers, I think the main aspects of J2SE is to have some of the following content.
1.JVM relevant
for people who are new to Java, JVM-related knowledge does not necessarily need to understand the deep, this concept there are some simple to understand.
But for a senior developer with more than 3 years experience in Java, the JVM will not nearly be unacceptable.
JVM to run java as a basis, it is hard to believe that for the JVM is not know who can eat the java language very thoroughly.
I have interviewed more than 3 years of Java developers experience when, JVM is almost a must-ask questions.
Of course, the decision is good or bad is not the only JVM technical capability interview question, but the level of evidence java development capabilities.
In the JVM in this category, I think there is need to have knowledge of:
- JVM memory model and structure
- GC principle, performance tuning
- Tuning: Thread Dump, memory structure analysis
- byte code class binary structure, class Loader system, class loading process, the instance creation process
- The method of execution
- Java every major version update new features provided by (need a simple understanding)
2.Java run
this might look a very simple, run java program who would not be?
But many times, we just simply to execute java program by IDE, IDE is the underlying java program how to implement it? Many people do not understand.
This is the most basic knowledge of java developers need to know, the first is definitely teach you how to perform a java program on the command line, but a lot of people once the java finished school, IDE spend, put this forgot a.
Why stressed the need to know it, know java purest initiator