The tab type app's main interface has the following 1. Early type: Viewpager + multiple layout files, the bottom can be linearlayout or RadioButton, by clicking on the bottom of the time to constantly change the Viewpager Setcurrentpager (), you can achieve the tab switch. 2. Android3.0 started using fragment, implemented through Fragmentmanager + fragment. This method does not use Viewpager, so you cannot implement a screen transition effect dragged by your finger. 3. Viewpager + Fragmentpagera
. How to add a breakpoint: First: Double-click the left margin of the code in the edit box to add it, double-click Delete. Second: Right-click->toggle breakpotion Add or remove in the space to the left of the line number where the code is located in the edit box. Third: Shortcut keys ctrl+shift+b, add or remove, note that you must place your cursor in the line of code where you added the breakpoint 3. How to track the program: F5: Enter method F6: line-by-row tracking F7: Jump Out of method F8:
RelativelayoutThe Location property of the subclass control itself:FramelayoutAbsolutelayout rarely usedTablelayoutTable layout with five layouts (tablelayout): The Tablelayout table layout model manages child controls as rows and columns, each of which behaves as a TableRow object, or it can be an object of view.Note: Hidden properties and shrink, extruded properties can only be placed in the parent class layout.The local property is for a control in TableRow.ActivityThere are two important loo
difference between JS and jquery.2nd Lesson JQuery DOM OperationsThis course focuses on finding elements in jquery, modifying element styles and content, and other ways to manipulate it.3rd lesson jquery EventsThis course focuses on 0-level events, Level 2 events, and event additions, removal, triggering, custom events, and namespaces in jquery objects.4th lesson jquery PluginThis course focuses on how to find the plug-ins you need, how to use them, how to introduce several common plugins, and
://localhost:8001 continues to issue 28 requests per second. Request per second indicates that the server processes requests per second as QPS . Failed requests indicates the number of requests that failed this request. The higher the value of the test, the greater the Connection Times connection time, which includes the process by which the client establishes a connection to the server, processes requests from the server, and waits for the message response.
Commonly used pressure testing tools
First, the principle of the use of composition relations :Minimizing the number of database tables and foreign key references between tables, without causing data redundancy, is a time-consuming operation to establish a connection to multiple tables.
Hibernate takes a mapping type as a bridge between Java type and SQL type, corresponding to the type attribute.There are two types: the built-in mapping type and the custom mapping type.One, built-in mapping type :1,JaVA basic types of Hibernate
1. persist entity domain objects directly through the JDBC API :A, java.sql Common interfaces and classes:DriverManager: Driver Manager, responsible for creating database connections.Connection: Represents a database connection.Statement:
One, the script file query:1, command format: which [-a] command; -A: Lists all, not only the first.Example: which ifconfig;Note: Because different user paths are different, there may be differences in the results.Second, the name of the search:1,
One, relative path and absolute path:A, Absolute path: The path that is written by the root directory/start, for example/usr/share/docB, relative path: a path that is not written by the root directory/start.Second, the relevant operation of the
First, the relationship between boot sector and Super BLOCK:1. Boot sector is used to store the boot loader, which occupies 1024 bytes.2, super block size is also 1024 bytes.3, if the block size is 1k, then the boot sector and Super block each
First, Mknod: Set the device codeIn Linux, all devices are represented by files, and the files are judged by major and minor values.Major is the main device code, minor is the device code (need to query), the example is as
After the partition is complete, the disk is formatted to generate the file system.Command format: MKFS [-T file system format] device file name Example: Mkfs-t Ext3/dev/sda6; The lack of the above command is not able to specify the volume label of
One, the dump command:This command can be backed up for the entire file system, or only for directories. You can also specify a different backup level ( -0~-9 a total of 10 levels).Dump-w: Lists whether the partitions with the dump settings
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