1、應(yīng)用服務(wù)器有那些?

　　BEA WebLogic Server，IBM WebSphere Application Server，Oracle9i Application Server，jBoss，Tomcat

　　2、給我一個你最常見到的runtime exception。

　　ArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException, ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException

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　　3、接口是否可繼承接口? 抽象類是否可實現(xiàn)(implements)接口? 抽象類是否可繼承實體類(concrete class)?

　　接口可以繼承接口。抽象類可以實現(xiàn)(implements)接口，抽象類是否可繼承實體類，但前提是實體類必須有明確的構(gòu)造函數(shù)。