Tài liệu Công Nghệ Thông Tin

Chương 4. Kiểu con trỏ (3 tiết) Khái niệm Khai báo và sử dụng biến con trỏ Sử dụng con trỏ để cấp phát và thu hồi bộ nhớ động Một vài bài toán sử dụng con trỏ Bài tập

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Regular expression Sequence of characters and symbols Useful for validating input and ensuring data format E.g., ZIP code Facilitate the construction of a compiler Regular-expression operations in String Method matches Matches the contents of a String to regular expression Returns a boolean indicating whether the match succeeded

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Precision Meaning varies depending on data type Floating point Number of digits to appear after decimal (e or E and f) Maximum number of significant digits (g or G) Strings Maximum number of characters to be written from string Format Use a dot (.) then precision number after % e.g., %.3f

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To add a Java DB database server in Netbeans Select Tools > Options to display the Netbeans Options dialog Click the Advanced Options button to display the Advanced Options dialog Under IDE Configuration, expand the Server and External Tool Settings node and select Java DB Database If the Java DB properties are not already configured, set the J...

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When using database columns to provide suggestions in an AutoComplete Text Field, sorting the columns eliminates the need to check every row in the database for potential matches. This significantly improves performance when dealing with a large database.

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Java Studio Creator 2 can automatically import any missing packages your Java file needs. For example, after adding the Properties object to Options.java, you can right click in the Java editor window and select Fix Imports to automatically import java.util.Properties.

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Most major database vendors provide their own JDBC database drivers, and many third-party vendors provide JDBC drivers as well. For more information on JDBC drivers, visit the Sun Microsystems JDBC Web site, servlet.java.sun.com/products/ jdbc/drivers.

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By default, applets cannot perform file processing Applets often limited in machine access Applets can communicate only with the machine from which it was originally downloaded Java Security API Digitally signed applets Applets given more privileges if from trusted source

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Even when using a bounded buffer, it is possible that a producer thread could fill the buffer, which would force the producer to wait until a consumer consumed a value to free an element in the buffer. Similarly, if the buffer is empty at any given time, a consumer thread must wait until the producer produces another value. The key to using a bound...

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Java applications’ appearances A program that uses Java’s Abstract Window Toolkit GUI components takes on the look-and-feel of the platform Allows users of the application on each platform to use GUI components with which they are already familiar Also introduces interesting portability issues Swing’s lightweight GUI components provide uniform ...

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