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what is sdk

The full name of sdk is "Software Development Kit", which means "software development kit" in Chinese. It is a set of tools provided by manufacturers of hardware platforms, operating systems (OS) or programming languages. SDKs assist software developers in creating applications for specific platforms, systems or programming languages. A basic SDK usually consists of a compiler, debugger, and application programming interface (API), but may also include other content, such as: documentation, libraries, runtime/development environment, testing/analysis tools, network protocols, etc.

Jan 06, 2023 pm 03:26 PM

java sdk

What is the difference between & and && in java

The difference between & and && in Java: 1. When the && operator operates, when the value of the first expression is false, the second expression will not be calculated; while the & operator does not care about the first expression. Both expressions will be executed whether the value of the expression is true. 2. The & operator can be used as a bitwise operator, but the && operator cannot.

Jan 06, 2023 pm 03:07 PM

java

How to use java equals() method

In Java, the equals() method is used to detect whether one object is equal to another object, the syntax is "Object.equals(Object2)"; this method determines whether two objects have the same reference. If the two objects have the same reference, They must be equal. The equals() method cannot operate on variables of basic data types.

Jan 06, 2023 pm 02:42 PM

java equals()

What are the three major characteristics of java

The three major characteristics of Java are: 1. Encapsulation, which means hiding certain information of a class inside the class and not allowing direct access by external programs. Instead, the operations and access to the hidden information are realized through the methods provided by the class. 2. Inheritance means that the subclass has all the properties and methods of the parent class, thereby realizing code reuse. 3. Polymorphism means that parent class references point to subclass objects, thus producing multiple forms.

Jan 06, 2023 pm 02:30 PM

java

What is the difference between overloading and rewriting in java

Differences: 1. Overloading implements compile-time polymorphism, while rewriting implements run-time polymorphism. 2. Overloading occurs in a class, and the parameter list of the method with the same name must be different; while overwriting occurs between a subclass and a parent class, the overriding method of the overridden method must be the same. 3. The return type of an overloaded method can be modified, but the overridden method cannot. 4. The exceptions of overloaded methods can be modified, and the exceptions of overridden methods can be reduced or deleted. New or wider exceptions must not be thrown. 5. The access of overloaded methods can be modified, but the access of overridden methods must not be more strictly restricted.

Jan 06, 2023 pm 02:14 PM

java

What are the most commonly used technology stacks in Java?

Commonly used technology stacks in Java include: 1. JDK; 2. Web framework; 3. Web container; 4. ORM framework; 5. Spring; 6. Database; 7. Search engine; 8. Back-end template engine; 9. Workflow ; 10. Other language middleware, such as Kafka, RocketMQ or RabbitMQ, etc.

Jan 05, 2023 am 11:36 AM

java technology stack

What to do if the dataoutputstream is garbled?

Solution to garbled dataoutputstream: 1. Write String through "dos.write("...".getBytes());"; 2. Set "new OutputStreamWriter(new FileOutputStream(file), "utf-8") ;" That's it.

Jan 05, 2023 am 11:28 AM

Garbled characters dataoutputstream

Several ways of paging in mybatis

Mybatis paging method: 1. Use arrays for paging. First query all the data, and then intercept the required parts from the list. 2. Use the Sql statement to perform paging, and add the limit paging statement after the sql statement. 3. Use the interceptor for paging, and add the limit statement to the end of the sql statement through the interceptor to perform paging queries. 4. To use RowBounds to implement paging, you need to obtain all qualified data at once, and then operate the big data in memory to achieve the paging effect.

Jan 04, 2023 pm 04:23 PM

mybatis

Several ways to implement multithreading in java

Ways to implement multi-threading: 1. Inherit the Thread class, rewrite the run method of the Thread class through the Thread class provided by JDK; 2. Implement the Runnable interface, Runnable is a "@FunctionalInterface" functional interface, which means You can use the lambda method provided by JDK8 to create thread tasks; 3. Use internal classes; 4. Use timers; 5. Thread implementation with return values; 6. Implement multi-threading based on thread pools.

Jan 04, 2023 pm 03:52 PM

java Multithreading

How to set eclipse language to Chinese

How to set the eclipse language to Chinese: 1. Open the browser to find the language pack download address, and copy the latest installation package address; 2. Open eclipse, click "help", and then click to install a new plug-in; 3. Click "Add ", paste the URL in Location; 4. Find the Simplified Chinese package in the drop-down menu, check it, click Next and wait for installation; 5. Restart eclipse.

Jan 04, 2023 pm 03:50 PM

eclipse Chinese

What is spring boot?

Spring Boot is a Spring-based framework provided by the Pivotal team that uses a specific way to configure, so that developers no longer need to define boilerplate configurations. Spring Boot integrates most of the currently popular development frameworks. Just like Maven integrates all JAR packages, Spring Boot integrates almost all frameworks, allowing developers to quickly build Spring projects.

Nov 29, 2022 am 11:46 AM

spring spring boot

What is the abbreviation of the running environment of java program?

The running environment of java programs is referred to as "JRE". JRE is a collection of environments necessary to run JAVA programs, including JVM standard implementation and Java core class libraries. JRE consists of two parts: 1. Java Runtime Environment, which is a Java platform on which applications can be run, tested, and transmitted; 2. Java Plug-in, which allows Java Applets and JavaBean components to run in browsers that use JRE.

Nov 28, 2022 pm 07:17 PM

java jre

What is the function of java final keyword

In Java, final can be used to modify classes, methods and variables. The final modified class means that the class cannot be inherited by any other class, which means that this class is a leaf class in an inheritance tree, and the design of this class has been considered perfect and does not need to be modified or extended. The method in the final modified class means that the class cannot be inherited by any other class and cannot be overridden; that is, the method is locked to prevent the inherited class from changing it. final modifies a variable in a class, indicating that the variable cannot be changed once it is initialized.

Nov 25, 2022 pm 04:26 PM

java final

What does private mean in java

In Java, private means "private" and is an access control modifier used to modify classes, properties and methods. Class members modified with private can only be accessed and modified by the methods of the class itself, and cannot be accessed and referenced by any other class (including subclasses of the class); therefore, the private modifier has the highest level of protection.

Nov 24, 2022 pm 06:27 PM

java private