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A class can provide its clients with static factory methods instead of, or in addition to, constructors Providing a static factory method instead of a public constructor has both advantages and disadvantages One advantage of static factory methods is that, unlike constructors, they have names If the parameters to a constructor do not, in and of themselves, describe the object being returned, a static factory with a well-chosen name can make a class easier to use and the resulting client code easier to read For example, the constructor BigInteger(int, int, Random), which returns a BigInteger that is probably prime, would have been better expressed as a static factory method named BigIntegerprobablePrime (This static factory method was eventually added in the 14 release) A class can have only a single constructor with a given signature Programmers have been known to get around this restriction by providing two constructors whose parameter lists differ only in the order of their parameter types This is a bad idea The user of such an API will never be able to remember which constructor is which and will end up calling the wrong one by mistake People reading code that uses these constructors will not know what the code does without referring to the class documentation Because static factory methods have names, they do not share with constructors the restriction that a class can have only one with a given signature In cases where a class seems to require multiple constructors with the same signature, you should consider replacing one or more constructors with static factory methods whose carefully chosen names highlight their differences A second advantage of static factory methods is that, unlike constructors, they are not required to create a new object each time they're invoked This allows immutable classes (Item 13) to use preconstructed instances or to cache instances as they're constructed and to.

rently at the top of the receiver Useful creation styles include:

string::const_iterator url_end(string::const_iterator b, string::const_iterator e) { return find_if(b, e, not_url_char); }

SWTSINGLE Creates a single-line text widget SWTMULTI Creates a multi-line text widget SWTWRAP Causes widget s text to wrap onto multiple lines if necessary SWTREAD_ONLY Creates a read-only text widget that cannot be edited SWTLEFT Creates a left-justified text widget SWTRIGHT Creates a right-justified text widget SWTCENTER Creates a center-justified text widget

The example code that follows creates a window frame with a single-line text field, which only allows digits (0 9) to be entered (see Figure 4 6)

This function just forwards its work to the library find_if function, which we used in 611/103 The predicate that we pass to find_if is one that we will write, named not_url_char It will return true when passed a character that cannot be in a URL:

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

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public class TextExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Text Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final Text text = new Text(shell, SWTMULTI); textaddVerifyListener(new VerifyListener() { public void verifyText(VerifyEvent event) { eventdoit = eventtextlength() == 0 || CharacterisDigit(eventtextcharAt(0)); } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }

bool not_url_char(char c) { // characters, in addition to alphanumerics, that can appear in a URL static const string url_ch = "~;/ :@= // see whether c can appear in a URL and return the negative return !(isalnum(c) || find(url_chbegin(), url_chend(), c) != url_chend()); }

As in the previous example, interesting lines are highlighted in bold After the creation of the text widget, a verify listener is added in which a VerifyListener is created that overrides the verifyText() method to verify that the character entered is a digit Note: If the user deletes or backspaces over some text, the eventtext will be empty

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