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What is the different of an Applet and a Java Application

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Asked By: rich

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The applet doesn't have the main function

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software engineer

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java, system, printin, out, sysrem.out.printin()

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pavan

Thursday, May 29, 2008 10:22 PM

System is a predefined final class in java
out is a PrintStream object

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What access level do you need to specify in the class declaration to ensure that only classes from the same directory can access it?

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Asked By: Dreamingcrow |

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You do not need to specify any access level, and Java will use a default package-private access level.

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Tuesday, May 13, 2008

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There are two classes: A and B. The class B needs to inform a class A when some important event has happened. What Java technique would you use to implement it?

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Asked By: Dreamingcrow |

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If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface. or some other implementation of the Listener pattern.

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Tuesday, May 13, 2008

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How would you make a copy of an entire Java object with its state?

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Asked By: Dreamingcrow |

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Have this class implement Cloneable interface and call its method clone().

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Tuesday, May 13, 2008

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What comes to mind when someone mentions a shallow copy in Java?

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Asked By: Dreamingcrow |

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Object cloning; a shallow copy reuses references to the original's member variables, but a (complete) deep copy clones the entire object tree.

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Tuesday, May 13, 2008

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What comes to mind when you hear about a young generation in Java?

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Garbage collection; a young generation is a recent collection of newly created objects, which is reclaimed more aggressively than older ones.

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Tuesday, May 13, 2008

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