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Most methods and constructors have some restrictions on what values may be passed into their parameters For example, it is not uncommon that index values must be nonnegative and object references must be non-null You should clearly document all such restrictions and enforce them with checks at the beginning of the method body This is a special case of the general principle, and you should attempt to detect errors as soon as possible after they occur Failing to do so makes it less likely that an error will be detected and makes it harder to determine the source of an error once it has been detected If an invalid parameter value is passed to a method and the method checks its parameters before execution, it will fail quickly and cleanly with an appropriate exception If the method fails to check its parameters, several things could happen The method could fail with a confusing exception in the midst of processing Worse, the method could return normally but silently compute the wrong result Worst of all, the method could return normally but leave some object in a compromised state, causing an error at some unrelated point in the code at some undetermined time in the future For public methods, use the Javadoc @throws tag to document the exception that will be thrown if a restriction on parameter values is violated (Item 44) Typically the exception will be IllegalArgumentException, IndexOutOfBoundsException, or NullPointerException (Item 42) Once you've documented the restrictions on a method's parameters and you've documented the exceptions that will be thrown if these restrictions are violated, it is a simple matter to enforce the restrictions Here's a typical example:

A function is a piece of program that has a name, and that another part of the program can call, or cause to run Every C++ program must contain a function named main When we ask the C++ implementation to run a program, it does so by calling this function The main function is required to yield an integer as its result, the purpose of which is to tell the implementation whether the program ran successfully A zero value indicates success; any other value means there was a problem Accordingly, we begin by writing

import import import import orgeclipseswt*; orgeclipseswtevents*; orgeclipseswtlayout*; orgeclipseswtwidgets*;

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public class ListExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("List Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final List list = new List(shell, SWTSINGLE); listsetItems(new String[] {"First", "Second", "Third"}); listaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { String[] selected = listgetSelection(); if (selectedlength > 0) Systemoutprintln( "Selected: " + selected[0]); } public void widgetDefaultSelected( SelectionEvent event) { String[] selected = listgetSelection(); if (selectedlength > 0) Systemoutprintln( "Default Selected: " + selected[0]); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }

int main()

After the list widget is created, its contents are set using the setItems() method Next, a selection listener is added in which a SelectionAdapter is created that overrides the widgetSelected() and widgetDefaultSelected() methods to print any items selected or double-clicked

Similar to the list widget, the combo box widget allows the user to select a single item from a list of available items Depending on how a combo is configured, it may also allow the user to enter a new value into the text field The last selected or entered item is displayed in the text box Useful APIs include:

to say that we are defining a function named main that returns a value of type int Here, int is the name that the core language uses to describe integers The parentheses after main enclose the parameters that our function receives from the implementation In this particular example, there are no parameters, so there is nothing between the parentheses We'll see how to use main's parameters in 104/179

/** * Returns a BigInteger whose value is (this mod m) This method * differs from the remainder method in that it always returns a * nonnegative BigInteger * * @param m the modulus, which must be positive * @return this mod m * @throws ArithmeticException if m <= 0 */ public BigInteger mod(BigInteger m) { if (msignum() <= 0) throw new ArithmeticException("Modulus not positive"); // Do the computation }

add(String) Adds the argument to the end of the receiver s list addModifyListener(ModifyListener) Adds the listener to the collection of listeners that will be notified when the receiver s text is modified by sending it one of the messages defined in the ModifyListener interface addSelectionListener(SelectionListener) Adds the listener to the collection of listeners that will be notified when the receiver s selection changes by sending it one of the messages defined in the SelectionListener interface clearSelection() Sets the selection in the receiver s text field to an

We continue our definition of the main function by following the parentheses with a sequence of statements enclosed in curly braces (often simply called braces):

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