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- Java inheritance and interfaces
- The most critical role of interfaces is also the most important reason for using interfaces: they can be traced back to multiple basic classes. The second reason for using an interface is the same as for using an abstract base class: to prevent the client programmer from making an object of this class and specifying that it is just an interface. This brings up a question: Should I use an interface or an abstract class? If we use interfaces, we can get the benefits of abstract classes and interfaces at the same time. So if the base class you want to create does not have any method definitions or member variables, then you are willing to use an interface instead of an abstract class anyway. In fact, if you know in advance that something is going to be a base class, your first option is to turn it into an interface. Only when you must use a method definition or become
- java类库 1803 2016-11-03 14:47:38
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- Java date conversion
- Java date conversion
- java类库 1713 2016-11-03 13:58:46
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- Initialization sequence of java classes
- In Java, when we create a new object, the members, initialization blocks and constructors in the object are loaded in a certain order. See the picture below:
- java类库 1658 2016-11-03 13:17:37
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- You can have a strong Wi-Fi network signal 'full'
- WiFi is widely used in life. For example, when you travel or exercise, when your phone is in an unstable wireless connection range, you may not be able to keep the signal strong because our phones are not always sure. The strongest WiFi signal is nearby, but I have a way around this.
- Other libraries 2089 2016-11-03 09:44:55
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- Google Firebase Cloud Messaging opens to multiple browsers
- Google believes engaging users and discovering the type of content they like should come first. The technical aspects of web notifications are a start, but should not be abused. Please note that it is ultimately the user's responsibility to choose to receive any type of notifications.
- Other libraries 2269 2016-11-03 09:17:45
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- Java final argument
- Java 1.1 allows us to make arguments final by declaring them appropriately in the argument list. This means that inside a method, we cannot change what the argument handle points to. As follows:
- java类库 1827 2016-11-02 15:06:04
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- java interface
- Sun Company feels that the abstract class of C++ is not good and does not strictly control it. Therefore, Sun upgraded abstract classes to interfaces. Abstract classes are rarely used in Java. All declarations use interfaces to implement them.
- java类库 1938 2016-11-02 14:57:00
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- Crawl all links on a website
- Crawl all links on a website
- java类库 4089 2016-11-02 14:42:07
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- Use Java to develop a tool to automatically detect whether a domain name can be registered
- Using Java to develop a tool to automatically detect whether a domain name can be registered
- java类库 2694 2016-11-02 14:38:33
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- Analysis and processing of Java thread leaks
- Analysis and processing of Java thread leaks
- java类库 4075 2016-11-02 14:31:35
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- Java basics-class variables, class methods
- Java basics-class variables, class methods
- java类库 1633 2016-11-02 14:16:22
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- Overload of member methods in Java inheritance
- If a Java base class has a method name that is "overloaded" multiple times, redefining that method name in a derived class will not hide any base class version. So whether the method is defined at this level or in a base class, the overloading will take effect.
- java类库 1848 2016-11-02 13:50:37
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- java data types
- java data types
- java类库 1776 2016-11-02 13:45:43
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- jersey + tomcat implement restful style
- jersey + tomcat implement restful style
- java类库 3389 2016-11-02 13:43:28
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- Summary of Java Concurrency Basics
- Concurrency is the ability to run multiple programs in parallel or run multiple parts of a program in parallel. If a time-consuming task in the program can be run asynchronously or in parallel, the throughput and interactivity of the entire program will be greatly improved. Modern PCs have multiple CPUs or multiple cores in a CPU. Whether the ability to use multiple cores properly will become the key to a large-scale application.
- java类库 1530 2016-11-02 10:41:56
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