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Any variables declared in the initializer are visible only within the for statement. This is different from C and C++, where the declaration introduces the variable into the enclosing block. The following code illustrates this point: Type is needed here for declaration. for( int i=0; i<10; i++ ) // Variable i is in scope here, and also Statement; // here within the statement. // Here, after the statement, i no longer exists. Type is needed here again because the previous variable i has gone out of existence. for( int i=0; i<10; i++ ) // We need to define a new variable i here, since Statement; // the previous one has gone out of existence. The local variables declared within the body of the loop are known only within the loop.

Yet another new piece of the Java Collections Framework is the new NavigableMap and NavigableSet interfaces. They extend the SortedMap and SortedSet interfaces, respectively, to essentially add search options to the interfaces.

Note Unlike C and C++, the scope of variables declared in the initializer lasts only for the length of the loop.

Another very simple example regards abstract functions. These are most often described as functions that have no implementation, existing only to establish their interface; one ascendant class in each lineage has the responsibility of establishing the implementation for that interface (and others have the option). But another type of abstract function has just enough implementation to establish how it uses other functions; this is commonly known as a Template mechanism type. (This is very appropriate for a framework.) In either case, an abstract function is meant to serve polymorphism, which requires a common interface. A class is abstract when it has at least one abstract function. (Java has a class type explicitly defined as an interface, which has all abstract functions. It is implemented [instead of extended] to a concrete class.)

Both the initializer and the iteration expression can contain multiple expressions as long as they are separated by commas. For example, the following code has two variable declarations in the initializer and two expressions in the iteration expression: static void Main( ) { const int MaxI = 5; Two declarations Two expressions for (int i = 0, j = 10; i < MaxI; i++, j += 10) { Console.WriteLine("{0}, {1}", i, j); } } This code produces the following output: 0, 1, 2, 3, 4, 10 20 30 40 50

For NavigableMap, there are essentially three sets of methods One set of methods gets you submaps, another set works with the map entries, and the last set works with the map keys There are three methods in the first set To start with, navigableHeadMap(toKey) returns a NavigableMap with all the keys up to, but not including, the toKey Next, there is navigableTailMap(fromKey), which returns a NavigableMap with all the keys, starting with the fromKey, inclusive, to the end Last, there is navigableSubMap(fromKey, toKey), which gives you a NavigableMap, starting with the fromKey, inclusive, to the toKey, exclusive Always remember that the starting key is inclusive and the ending key is exclusive ([startKey, endKey)) Functionally, these methods are the same as the headMap(), tailMap(), and subMap() methods of SortedMap, but return a different type NavigableMap instead The second set of methods works with the keys of the map.

When the flow of control reaches jump statements, program execution is unconditionally transferred to another part of the program. The jump statements are the following: break continue return goto throw This chapter covers the first four of these statements. The throw statement is discussed in 11.

Another simple, but often frowned on, example regards the fact that ascendant functions can nullify ancestor functions (when they are virtual). Virtual functions are dynamically loaded, at execution, so they are meant to be dynamically replaced with overriding functions, but any can actually be overridden with a null function. This is discouraged because each child is supposed to either propagate or build on its parent s characteristics, but that can sometimes make extending a family complicated; and that s really not necessary, because a virtual function can be interpreted, in the vocabulary of a family, as a recessive gene (which might, in any generation, go away). Of course, this should probably be an exception, especially for considerations of memory usage.