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With SortedMap, you have the methods firstKey() and lastKey() for getting the edge keys of the map NavigableMap adds several other keys you can get, as follows: ceilingKey(key): Used for getting the first key of the map greater than or equal to the given key, or null if there is none floorKey(key): Used for getting the first key of the map less than or equal to the given key, or null if there is none higherKey(key): Used for getting the first key of the map strictly greater than the given key, or null if there is none lowerKey(key): Used for getting the first key of the map strictly less than the given key, or null if there is none The third set of methods is probably the most useful When working with a SortedMap or Map instance, in general, you would get the key and then look up its value.

Earlier in this chapter you saw the break statement used in the switch statement. It can also be used in the following statement types as well: for foreach while do In the body of one of these statements, break causes execution to exit the innermost enclosing statement. For example, the following while loop would be an infinite loop if it relied only on its test expression, which is always true. But instead, after three iterations of the loop, the break statement is encountered and the loop is exited. int x = 0; while( true ) { x++; if( x >= 3 ) break; }

The continue statement causes program execution to go to the top of the innermost enclosing loop of the following types: while do for foreach For example, the following for loop is executed five times. In the first three iterations, it encounters the continue statement and goes directly back to the top of the loop, missing the WriteLine statement at the bottom of the loop. Execution only reaches the WriteLine statement during the last two iterations. for( int x=0; x<5; x++ ) { if( x < 3 ) continue; // Execute loop five times // The first three times // Go directly back to top of loop

This last set of methods returns a MapEntry instance instead of a key Thus, you don t have to do the secondary lookup operation So, there are six new methods for the new operations mentioned in the second set, as follows:.

Binding (or, in older terminology, linkage) can be thought of as a connection, as follows. Inheritance is an implicit connection; it is automatically part of a class. Composition is an explicit connection; it requires specific code. And polymorphism is a dynamic connection; it is determined by execution conditions.

// This line is only reached when x is 3 or greater. Console.WriteLine("Value of x is {0}", x); } This code produces the following output: Value of x is 3 Value of x is 4 The following code shows an example of a continue statement in a while loop. This code produces the same output as the preceding for loop example. int x = 0; while( x < 5 ) { if( x < 3 ) { x++; continue; }

Remember that for a reference type, the data of an instance is always stored in the heap. Since both members are part of the object s data, they are both stored in the heap, regardless of whether they are value or reference types. Figure 3-10 illustrates the case of type MyType. Even though member A is a value type, it is part of the data of the instance of MyType, and is therefore stored with the object s data in the heap. Member B is a reference type, and therefore its data portion will always be stored in the heap, as shown by the small box marked Data. What s different is that its reference is also stored in the heap, inside the data portion of the enclosing MyType object.