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Figure 15-3. Instantiating the delegates Besides allocating the memory for the delegate, creating a delegate object also places the first method in the delegate s invocation list. You can also create the variable and instantiate the object in the same statement, using the initializer syntax. For example, the following statements also produce the same configuration shown in Figure 15-3. MyDel delVar = new MyDel( myInstObj.MyM1 ); MyDel dVar = new MyDel( SClass.OtherM2 ); The following statements use the shortcut syntax, but again produce the results shown in Figure 15-3. MyDel delVar = myInstObj.MyM1; MyDel dVar = SClass.OtherM2;

1 1 5 5 1 1 4 4 3 3 2 2 3 3 2 2 2 6 6 2 2 2

Because delegates are reference types, you can change the reference contained in a delegate variable by assigning to it. The old delegate object will be disposed of by the Garbage Collector (GC) when it gets around to it. For example, the following code sets and then changes the value of delVar. Figure 15-4 illustrates the code. MyDel delVar; delVar = myInstObj.MyM1; ... delVar = SClass.OtherM2;

XML is a subset of the SGML metalanguage, specifically designed to enable simpler definition of markup languages.

All the delegates you ve seen so far have had only a single method in their invocation lists. Delegates can be combined by using the addition operator. The result of the operation is the creation of a new delegate, with an invocation list that is the concatenation of copies of the invocation lists of the two operand delegates. For example, the following code creates three delegates. The third delegate is created from the combination of the first two. MyDel delA = myInstObj.MyM1; MyDel delB = SClass.OtherM2; MyDel delC = delA + delB; // Has combined invocation list

1 1 6 6 2 2 6 6 12 12 3 3 5 5 2 2 2 6 6 11 11 2

Although the term combining delegates might give the impression that the operand delegates are modified, they are not changed at all. In fact, delegates are immutable. After a delegate object is created, it cannot be changed. Figure 15-5 illustrates the results of the preceding code. Notice that the operand delegates remain unchanged.

But XML s fundamental flexibility must be anchored by a strict syntax structure. Every beginning tag must have an ending tag, and combined tag scopes must create a solid structure properly stacked. In other words, a scope that contains another scope can t logically end before that (contained) one. These rules are said to create well-formed definitions. (SGML has these same rules and alternatives.) So, XML can be used to very effectively define data structures. XML tags are typically spelled out and easily understandable, as program variable names are. Just as with HTML, an ending tag is the same as its beginning tag, preceded by a slash. And, for human readability, the data definitions are typically indented to reflect the structures, like an outline; this is very helpful, because an XML document can become extremely wordy.

For all these packages, the bulk of the changes from 5.0 to 6.0 were related to documentation. The only code change outside of the javadoc comments was the addition of an overloaded newInstance() method for several factory classes: javax.xml.datatype. DatatypeFactory, javax.xml.parsers.DocumentBuilderFactory, javax.xml.parsers. SAXParserFactory, javax.xml.transform.TransformerFactory, and javax.xml.validation. SchemaFactory. While these classes had a newInstance() method already, the overloaded variety allows you to pass in the class loader to load the factory class, and not assume that the class loader for the context of the executing thread is appropriate.