IUpdateStrategy's, couldn't a Multistrategy hold a Multistrategy, which is holding a Multistrategy (or two) which is hold a Multistrategy, which is holding. Objects First with Java A Practical Introduction Using BlueJ David J. Use the same techniques as before: strategies that hold strategies.īut isn't a MultiStrategy an IUpdateStrategy iteself? That is, since a MultiStrategy holds Contribute to Alex-Golub/various-books-exercise-solutions development by.
#BLUEJ EXERCISE SOLUTIONS CODE#
guided students through debugging faulty code with limited hints and revealing answers. An explicitĬast is required to supress the compile time error ( aop = (AddOp) bop), but may trigger a run-time error if indeed the instance referred to by bop is not of type Another system, DebugIT 4 produced an exercise based debugging. The above assignment will cause a compile time error because the compiler cannot know if the assignment is possible. Another way of saying this is thatĪ superset contains its subsets but not the other way around. Object of the type of any subclass, but a variable of the type of a particular subclass cannot necessarily reference something of the type of its superclass.
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That is, a variable of the type of the superclass can always reference an I am using the same textbook Objects First with Java A Practical Introduction Using BlueJ 6th Edition Barnes Solutions Manual. staticly typed as such), which and does not necessarily referenceĪn object of type AddOp. Not as written, because bop is a variable of type IBinaryOp (i.e. Yes! bop is a variable of type IBinaryOp, and aop is defined as referencing an AddOp object, which is an No, because aop is a variable of type AddOp, and MultIOp is not an AddOp, so aop cannot reference an instance of MultOp. Yes, because aop is a variable of type AddOp, and thus can reference an instance of the same type. If we had MultOp mop = new MultOp(), then mop.getDescription() is perfectly legal. This is because the static typing of bop tells the compiler that it references an IBinaryOp, not the particular concrete type of the object it currently references. No, because bop is a variable of type IBinaryOp, which is not defined as having a getDescription method. It is impossible to tell because it depends on the exact type of the object instance to which myOp refers. The result is 15 because bop now refers to an MultOp instance, whose apply method multiplies its two input values. The result is 8 because bop refers to an AddOp instance, whose apply method adds its two input MultOp is an IBinaryOp, so bop can reference it. Yes, for the same reasons as the previous exercise! MultOp is an concrete class and can be instantiated. AddOp is an IBinaryOp (technically, AddOp implements the IBinaryOpinterface), so bop can reference it. Yes! AddOp is an concrete class and can be instantiated. IBinaryOp is an interface and does not specify any actual executable code, so it cannot be instantiated. The SON MOSFET technology is found to offer devices with further scalability and enhanced performance in terms of threshold voltage roll-off, sub-threshold slope and greater current derivability, thereby providing scope for further miniaturisation of devices and much better performance improvement.Available under Creative Commons-ShareAlike 4.0 International License. The performance of the two devices are studied and compared in terms of threshold voltage roll-off, subthreshold slope, drain current and drain conductance.
Identical structures for both the devices, SOI and SON, are considered but for SON MOSFET, the buried oxide layer is replaced by air. In order to provide a better explanation to various observations and applicable to short-channel SOI and SON structures, the present current voltage model includes the effect of carrier velocity saturation and channel length modulation.
Based on the threshold voltage model, an analytical current voltage model is formulated from the basic charge control analysis of MOSFET. The model includes different threshold voltage-modifying short-channel phenomena like fringing field, junction-induced 2D-effects, etc. A generalised three-interface compact capacitive threshold voltage model for horizontal silicon-on-insulator/silicon-on-nothing (SOI/SON) MOSFET has been developed.
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