java英文面試筆試題-在線瀏覽
2025-04-13 02:07本頁面
【正文】 s using new methods in the ResultSet interface allows programmatically move the to particular row or to a position relative to its current position JDBC Core API provides the Batch Updates functionality to the java applications. Java applications can now use the methods. New data types interfaces mapping the SQL3 data types Custom mapping of userdefined types (UTDs) Miscellaneous features, including performance hints, the use of character streams, full precision for values, additional security, and support for time zones in date, time, and timestamp values. Question: Explain garbage collection? Answer: Garbage collection is one of the most important feature of Java. Garbage collection is also called automatic memory management as JVM automatically removes the unused variables/objects (value is null) from the memory. User program cannt directly free the object from memory, instead it is the job of the garbage collector to automatically free the objects that are no longer referenced by a program. Every class inherits finalize() method from , the finalize() method is called by garbage collector when it determines no more references to the object exists. In Java, it is good idea to explicitly assign null into a variable when no more in use. I Java on calling () and (), JVM tries to recycle the unused objects, but there is no guarantee
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