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You need to add a directory or a jar file that contains the package directories to the CLASSPATH environment variable. Let's say a class Employee belongs to a package com.xyz.hr; and is located in the file c:\dev\com\xyz\hr\Employee.java. In this case, you'd need to add c:\dev to the variable CLASSPATH. If this class contains the method main(), you could test it from a command prompt window as follows:
c:\>java com.xyz.hr.Employee
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It's possible if these variables are final.
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A single ampersand here would lead to a NullPointerException.
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Use the following syntax: super.myMethod(); To call a constructor of the superclass, just call super() in the first line of the subclass's constructor, passing any required parameters.
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Yes, but abstract classes are more limited because a class can only extend one class but can implement multiple interfaces.
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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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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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Have this class implement Cloneable interface and call its method clone().
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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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You do not need to specify any access level, and Java will use a default package-private access level.
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