6. Implement the Keys and values properties in the IDictionary interface
Now we can focus on the implementation of the IDictionary interface. In the 4th section, the simplest example of a particular interface is given, and let's review how it implements the keys and values attributes in the IDictionary interface.
public ICollection Keys { //返回所有键的集合 get
Because a lot of people don't know what the built-in functions are in the dictionary? What's the effect? So in this article I'm going to introduce you to the Python
keys function in the Python dictionary, what the keys function means, and what the function will do in the next article.
First of all, what can we do with this function?
Keys function
The Python
Eclipse shortcut Keys DaquanCtrl+1 Quick Fix (the most classic shortcuts, you don't have to say more)Ctrl+d: Delete When moving forwardCtrl+alt+↓ Copy the current row to the next row (replication incremented)Ctrl+alt+↑ Copy the current line to the previous row (replication incremented)Alt+↓ the current line and the next line of interaction (especially useful, can be omitted first cut, then pasted)Alt+↑ the current line and the upper row interaction po
bit more, the following to talk about the foreign key this thing.Let's talk about the advantages of foreign keys :1. Through the foreign key, the database itself can guarantee the integrity and consistency of the data, although we can write some code in the program to maintain, but the program always has no way to ensure the integrity and consistency of the data 100%. The outside key itself is part of the database, so when the database server problem
. NET WinForm keyDown event direction keys do not respond ---- C # C ++/CLI,
When performing 3D roaming, WASD and direction keys are used respectively to control the front and right sides of the angle of view. The KeyDown event records the roaming start mark. However, WASD can be accessed through Debug, but the direction keys are always inaccessible, it is strang
Record the commonly used shortcut keys in eclipse, so that you can forget to view them later. CTRL + Shift + O Delete unnecessary import packages
CTRL + 1 quick fix (the most classic shortcut, you don't need to talk about it)CTRL + D: Delete the current rowCTRL + ALT + ↓Copy the current row to the next row (copy added)CTRL + ALT + ↓ copy the current row to the previous row (copy added)
Alt + ↓The interaction position between the current row and the
Scancode Map of the magical, the keys to change freely!
in the Windows xp/windows 2000 system, a new keyboard scanning code mapping method is provided, allowing you to freely set the layout of keyboard keys, which is the "Scancode map" in the registry we cleverly use "Scancode map" The ordinary keyboard can be transformed into a casual personalized keyboard.
in order to set it up corre
One Eclipse hardcore developer combines the 10 most useful shortcut keys in Eclipse to summarize the most useful but less well-known combination of shortcut keys. Through these combinations, you can easily browse the source code, improving the overall development efficiency and quality.
1. ctrl + shift + r: Open the resource
This may be the most time-efficient combination of all shortcut
when the script is executed after the data is imported to the test machine. If the script is executed manually, the Code is not executed. If the script is executed, the execution is very slow. The code for this row is:
$Redis->delete($Redis->keys($pre_key_del.'*'));
A prompt is displayed when you view the manual:
KEYS is very fast, but using it in a large database may still cause performance problems. If y
bounce out.2,. MyEclipse inside how to use shortcut key System.out.println ():If you do not have a command name named Sysout when you print the SY character, you can customize the string and command name you want to print. Similar (can Key-value) can be customized here windows->preferences->java->editor->templates->new.3. Prompt for shortcut key settings:Open Window->preference->generate->keys, a large dialog box appears, "alt+/" corresponding to the
Eclipse Common shortcut keysEclipse's editing capabilities are powerful, and mastering the Eclipse shortcut key capabilities can greatly improve development efficiency. There are several shortcut keys related to editing in Eclipse.1. "Alt+/"This shortcut is a good helper for the user to edit, can provide users with the content of the auxiliary, do not worry about the method and the name of the property, when not the whole class, methods and attributes
10 most useful shortcut key combinations in EclipseAn eclipse-level developer summarizes what he thinks is the most useful but less known shortcut key combination. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in your
1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in your workspace, and you only need to press the first few letters of the file name or mask name, such as Applic*.xml. The drawback is that this set of shortcuts is not available in all views.2. Ctrl+o: Fast OutlineIf you want to see the methods of the current class or a particular method, but do not want
10 most useful shortcut key combinations in eclipse an eclipse-level developer summarizes the shortcut key combinations he thinks are the most useful but less known. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in you
In daily work, a lot of things to deal with the computer often, especially high frequency use of some professional software, or play some keyboard streaming nature of the game, you should be familiar with the commonly used shortcut keys, so play not only efficient, but also slightly professional.For some IT workers, the Linux shell terminal is a frequently used tool, if you can skillfully use shortcut keys,
10 most useful shortcut key combinations in eclipse an eclipse-level developer summarizes the shortcut key combinations he thinks are the most useful but less known. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in you
10 most useful shortcut key combinations in eclipse an eclipse-level developer summarizes the shortcut key combinations he thinks are the most useful but less known. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in you
10 most useful shortcut key combinations in eclipse an eclipse-level developer summarizes the shortcut key combinations he thinks are the most useful but less known. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in you
10 most useful shortcut key combinations in eclipse an eclipse-level developer summarizes the shortcut key combinations he thinks are the most useful but less known. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in you
10 most useful shortcut key combinations in eclipseAn eclipse-level developer summarizes what he thinks is the most useful but less known shortcut key combination. These combinations make it easier to navigate through the source code, resulting in improved overall development efficiency and quality.1. Ctrl+shift+r: Open ResourceThis is probably the most time-saving combination of all shortcut keys. This set of shortcuts lets you open any file in your
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