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class Derived1 : Base { // Override Who() in a derived class public override void Who() { ConsoleWriteLine("Who() in Derived1"); } } class Derived2 : Derived1 { // This class also does not override Who() } class Derived3 : Derived2 { // This class does not override Who() } class NoOverrideDemo2 { static void Main() { Derived3 dOb = new Derived3(); Base baseRef; // a base class reference baseRef = dOb; baseRefWho(); // calls Derived1's Who() } }

8 Click Next to proceed to Step 4 of the wizard In this step, the wizard tells you how many classes, objects, and joins your initial universe contains Click Finish to exit the wizard and view the universe in Designer 9 Click File | Save from the pull-down menu or click the Save button on the toolbar to save your universe

The output is shown here:

FIGURE 83 Linear ball bearing for translating follower (Courtesy Warner Electric, South Beliot, Ill)

contained spaces, you would have been prompted for a filename different from the universe name This is no longer the case in XI, which will automatically use the long universe name as the filename 10 For other designers or end users to see this universe, you must export it to the repository From the Designer pull-down menu, select File | Export Congratulations! You have just completed your initial universe If only a real business universe could be this easy!

Here, Derived3 inherits Derived2, which inherits Derived1, which inherits Base As the output verifies, since Who( ) is not overridden by either Derived3 or Derived2, it is the override of Who( ) in Derived1 that is executed, since it is the first version of Who( ) that is found One other point: Properties can also be modified by the virtual keyword and overridden using override The same is true for indexers

As mentioned at the start of this section, the generic collection classes largely parallel their non-generic relatives, although in some cases the names have been changed Also, some differences in organization and functionality exist The generic collections are defined in

ous sliding followers, we have the following frictional losses: (a) oil viscosity, (b) hysteresis loss due to the damping of the rolling materials, (c) excessive working load impact (if it exists), (d) number of follower rollers (either one or two) affected by change in inertia force, (e) number of times of rotation of roller, (f) de ection of the follower stem, producing misalignment and wear on the roller, (g) skidding loss of bearing in its container, (h) inging oil from rotating bearings, and (i) excessive oil in the bearing Rolling-element followers have a coef cient of friction 001 < mk < 015 This wide range is due to the uncertainty as to the actual performance of this kind of follower 863 Linear Ball Bearings These commercially produced low-friction ball mechanisms are available in many applications, as they speci cally are used for linear translation followers and have a coef cient of friction mk > 0010 < mk < 0050, depending on the lubrication adversities previously discussed Fig 83 shows a picture of a linear ball bearing used to guide and support a translating follower

Part II:

25:

SystemCollectionsGeneric The ones described in this chapter are shown in Table 25-14 These classes form the core of the generic collections

In cam-follower systems the follower must be held in contact with the cam at all times to counteract the follower inertia The follower inertia follows the acceleration curve with the magnitude of the negative acceleration being of concern The constraint of the follower should be accomplished by utilizing a preloaded compression spring, usually a helical coil The spring force is directly proportional to the follower displacement If the force is too small it will allow the follower to jump off the cam On the other hand, an excessive spring force is re ected throughout the system during the total cycle of operation This excessive force will require a stronger design system and more wear of parts will result Also, one of the disadvantages of spring-loaded systems is that the spring force produces an additional load on the system Figure 84 shows a cam-follower mechanism with its displacement and inertia force curves, which are shaped as the acceleration curve Also shown is a properly designed

Summary

NOTE SystemCollectionsGeneric also includes the following classes: