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Mega List X10 Links.txt

1. Under what circumstances might it be better to use a linked list instead of an array of structs or objects? Under what circumstances might it be better to use an array of structs or objects instead of a linked list? Issues: max size, shrink/grow, editing (insert/delete), direct access versus traversal.

Mega List X10 Links.txt


On the negative side, the size of an array must be a constant. So the size of an array is fixed at compile-time. When you store data in an array, you set an upper limit on the number of data items that can be processed. The only limit on the size of a linked list is the size of the computer's memory. In situations where the number of data items that will need to be processed is unknown, a linked list may be a better choice.

As another example, suppose that some users of an inventory control program will have up to 200 inventory items. But other users may only have 50 inventory items. Allocating an array of 200 inventory items when you only need to store 50 wastes memory. In situations where the amount of data that different users will need to process varies a lot, a linked list might be a good choice. (Note: it is usually not practical to create a custom version of a program for each user. For example, would a company want to sell one version of a word processor to users who only need to create small documents and a different version to users who need to create larger documents?)

Say you are keeping a list of inventory items where each item is represented as a structure or object. The list of items may change - items may be added to the list or removed from the list. You might want to keep the list in some pre-determined order - maybe sorted on the inventory item number.

If you store the list in an array of structs or array of objects, inserting or deleting inventory items can involve a substantial amount of work. For example, if you need to insert a new inventory item at index 95 of the array, all items from index 95 through the end of the list need to be copied to the next higher position in the array to make room for the new item. If you need to delete the item at index 80 in the array, you need to fill in the hole left by the deleted item by copying the item from index 81 into the vacant position, and each remaining item in the list must be copied to the next lower index in the array.

If the list is stored in a linked list, a new inventory item can be added by allocating a new struct or object for the new item, then changing links (pointers) in the list to add the item. Deleting an item in the list merely involves changing the links to bypass the deleted item and then freeing the deleted struct or object. With linked lists, you never have to move the data from one place to another when inserting or deleting. So linked lists can be much more efficient in this situation.

To clone an existing referenced domain model, select it in the Model Links list, right-click, and choose the Clone command from the context menu. The process flow is similar to that followed when cloning an Item Revision in the Explorer panel:

Like an Excel spreadsheet, the model links can be further filtered by the contents of each column. To do this, click the small funnel (filter) icon, located at the right-hand side of a column header (). A menu will appear containing a checkbox for each value present in that column. Enable the required checkbox(es) to reduce the list to only include model links with that value.

The Component Editor facilitates addition of multiple new components in one hit. Right-click and choose the Operations Add Components command. Then, in the Add Components dialog that is presented, enter the number of components you wish to add and click OK - new component definitions for the specified number of components will be added to the component definitions grid, at the bottom of the current list of component definitions. In concert with the grids multi-cell editing support, and copy/paste features, you can quickly build an impressive array of component definitions in quick time.

Having enabled the use of datasheets, you now need to upload them. Essentially, you upload any number of datasheets for the currently selected component, but can then assign all, or specific sheets, across the various components being defined. Once the Datasheet entity has been added to the Required Models/Parameters region, a Datasheet entry will be presented in the Model Links region. Clicking on this will show the list of datasheets currently assigned (linked) to the selected component, in the preview region.

When you initially attach (upload) a datasheet, you are doing so for the currently selected component. But the beauty of the system is that all uploaded datasheets are available for linkage to other components being defined as well. Click the control at the right of the Datasheets cell to access a listing of the available datasheets, and use the associated checkboxes to attach/remove a datasheet to/from the component.

Facilitating the ability to quickly create component definitions that differ slightly from one another, the editor provides cloning functionality. To clone an existing definition, select it in the list of definitions and choose the Edit Clone Component command from the main menus or right-click and choose the Clone Component command from the context menu (shortcut: Ctrl+D). The clone will be added to the bottom of the list of definitions.

Like an Excel spreadsheet, the component definitions can be further filtered by the contents of each column. To do this, click the small funnel (filter) icon, located at the right-hand side of a column header (). A menu will appear containing a checkbox for each value present in that column. Enable the required checkbox(es) to reduce the list to only include component definitions with that value.

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You should use a LinkedList when you plan to add or remove many values at the front or back of the list, or when you plan to make many filtering passes over the list in which you remove certain elements.

An iterator is an object that represents a position within a list and enables you to view or make changes to the elements at that position.Iterators are often used with linked lists because they retain the position in the list, so you don't have to call expensive list methods like get, add, or remove many times on the middle or end of the list.

Collections.sort would not work on a list of Point objects by default because they do not implement the Comparable interface.To make it work, you could pass a Comparator that defines an ordering for Points.

We use a toString method because this is the standard way of printing objects in Java.It is also more versatile than a print method because it can print the text representation of the list to any target, such as a file or GUI.

The checkIndex method tests whether a given index is between 0 and the size of the list, and if not, throws an exception.If the client passes an invalid index by mistake, the method will halt the program's execution.

The checkCapacity method tests whether the array's size will exceed the length of the internal array (capacity), and if so, throws an exception.If the client adds too many elements to the list, the method will halt the program's execution.

The list doubles in size when it exceeds its capacity.This is done instead of resizing by a constant amount so that the overall cost of adding elements to the end of a list will be amortized to be O(1), constant time.

An annotation is a special directive to the compiler with additional information about a class, method, or other structure.Annotations help us when writing our generic list because we can instruct the compiler not to warn us about potentially unsafe casting operations.

The difference between a linked list and an array list is that while an array list stores all of its elements in a single large array, a linked list stores each element inside its own container object called a node.The nodes are connected (linked) to each other by references.The two kinds of lists are similar in that they both implement the same external operations to clients, such as methods for adding, removing, accessing, and locating elements.

A node is a small object that stores a single element of a linked list.The list object stores reference(s) to a small number of nodes, perhaps only the front of the list.The front contains a chain of references that connect to the other elements of the list.

Inserting and removing is most expensive at the end of the list, because the code must loop through all of the next references to reach the end.This is the opposite of the array list, which inserts/removes most slowly at the start because of the shifting of elements that is required.

The "inchworm approach" is when an algorithm keeps track of two linked node references, one for the previous node and one for the current node.They are moved forward together over the list until a particular position is reached.At that point, the previous reference is modified as appropriate.One advantage of this approach is that you do not need to write complex chains of dereferences such as

The main advantage of the IntList interface is that client code can take advantage of polymorphism.A client program can deal with an IntList reference and the actual object at runtime can be an instance of either kind of list.

When changing the linked list to store elements of type E, the list class, its nested classes, and several methods must be changed to use the new generic type.We must change any comparisons between objects to use equals instead of ==.In our code, we also use dummy header nodes and add a back reference to increase the efficiency when adding to the end of the list. 041b061a72


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