Core Java 面试题与答案
Test your skills through the online practice test: Core Java Quiz Online Practice Test
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问题 256. What is DriverManager?
The basic service to manage set of JDBC drivers.
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问题 257. What is Class.forName() does and how it is useful?
It loads the class into the ClassLoader. It returns the Class. Using that you can get the instance ( 'class-instance'??.newInstance() ).
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问题 258. What do you mean by RMI and how it is useful?
RMI is a remote method invocation. Using RMI, you can work with remote object. The function calls are as though you are invoking a local variable. So it gives you a impression that you are working really with a object that resides within your own JVM (Java Virtual Machine) though it is somewhere.
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问题 259. What is the protocol used by RMI?
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问题 260. What is the use of PreparedStatement?
PreparedStatements are precompiled statements. It is mainly used to speed up the process of inserting/updating/deleting especially when there is a bulk processing.
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