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selection listener is added to the first combo in which a SelectionAdapter is created that overrides the widgetSelected() method, and a modify listener is added to the second combo in which a ModifyListener is created that overrides the modifyText() method Both methods update the contents of the label widget when their respective combo changes its selection

assertions rather than normal checks If you are using a release of the platform that supports assertions (14 or later), you should use the assert construct; otherwise you should use a makeshift assertion mechanism It is particularly important to check the validity of parameters that are not used by a method but are stored away for later use For example, consider the static factory method on page 86, which takes an int array and returns a List view of the array If a client of this method were to pass in null, the method would throw a NullPointerException because the method contains an explicit check If the check had been omitted, the method would return a reference to a newly created List instance that would throw a NullPointerException as soon as a client attempted to use it By that time, unfortunately, the origin of the List instance might be very difficult to determine, which could greatly complicate the task of debugging Constructors represent a special case of the principle that you should check the validity of parameters that are to be stored away for later use It is very important to check the validity of parameters to constructors to prevent the construction of an object that violates class invariants There are exceptions to the rule that you should check a method's parameters before performing its computation An important exception is the case in which the validity check would be expensive or impractical and the validity check is performed implicitly in the process of doing the computation For example, consider a method that sorts a list of objects, such as Collectionssort(List) All of the objects in the list must be mutually comparable In the process of sorting the list, every object in the list will be compared to some other object in the list If the objects aren't mutually comparable, one of these comparisons will throw a ClassCastException, which is exactly what the sort method should do Therefore there would be little point in checking ahead of time that the elements in the list were mutually comparable Note, however, that indiscriminate application of this technique can result in a loss of failure atomicity (Item 46) Occasionally, a computation implicitly performs the required validity check on some parameter but throws the wrong exception if the check fails That is to say, the exception that the computation would naturally throw as the result of an invalid parameter value does not match the exception that you have documented the method to throw Under these circumstances, you should use the exception translation idiom described in Item 43 to translate the natural exception into the correct one Do not infer from this item that arbitrary restrictions on parameters are a good thing On the contrary, you should design methods to be as general as it is practical to make them The fewer restrictions that you place on parameters, the better, assuming the method can do something reasonable with all of the parameter values that it accepts Often, however, some restrictions are intrinsic to the abstraction being implemented To summarize, each time you write a method or constructor, you should think about what restrictions exist on its parameters You should document these restrictions and enforce them with explicit checks at the beginning of the method body It is important to get into the habit of doing this; the modest work that it entails will be paid back with interest the first time a validity check fails.

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The table widget provides a vertical, multicolumn list of items showing a row of cells for each item in the list The columns of the table are defined by one or more TableColumn instances, each of which defines its own heading, width, and alignment Useful APIs include:

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