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- Java determines whether it is a palindrome
- The first is to invert the strings and compare them one by one. The second method is to invert the string and create a new string for direct comparison. The third method is to compare by intercepting strings. The fourth method is to use the boolean method to directly determine whether it is a palindrome number.
- Javagetting Started 3372 2019-11-15 09:19:56
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- How many bytes are int in java?
- The int data type in Java is a 4-byte, 32-bit, signed integer represented in two's complement. Its value range is: [-2 to the 31st power (-2147483648), 2 to the 31st power minus one (2147483647)]. It is stored in the memory in the form of complement.
- Javagetting Started 8509 2019-11-15 09:11:12
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- How to define array in java
- Dynamic mode (specify the length of the array), format: "Data type stored in array [] array name = new Data type stored in array [length];". Static mode (specify the elements of the array), format: "data type [] array name = new data type [] {element 1, element 2, element 3...};".
- Javagetting Started 11718 2019-11-14 17:59:51
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- What are the differences between java abstract classes and interfaces?
- The difference between interfaces and abstract classes: Abstract classes can contain ordinary methods, but interfaces can only contain public abstract methods. Member variables in abstract classes have no access restrictions, but variables in interfaces can only be modified by public static final, etc.
- Javagetting Started 4350 2019-11-14 17:47:20
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- java what is encapsulation
- Encapsulation: Hiding some information of a class inside the class and not allowing direct access by external programs. Instead, the hidden information is operated and accessed through the methods provided by the class. Benefits: Data can only be accessed through specified methods; the instance details of the class are hidden to facilitate modification and implementation.
- Javagetting Started 5878 2019-11-14 17:38:51
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- java what is entity
- Java entities are specific classes, like the M in MVC refers to entities, which are divided into business logic layer, DAO layer, and controller layer. The DAO layer and business logic layer operate on entity objects. Generally, a single piece of data taken out from the database is packaged into an entity class for easy operation, or a specific class in a Java program is packaged into an entity.
- Javagetting Started 4056 2019-11-14 17:33:11
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- java what is serialization
- Serialization is a mechanism used to process object streams. The so-called object stream is to stream the contents of objects. The streamed objects can be read and written, and the streamed objects can also be transmitted between networks. Serialization is to solve the problems caused when reading and writing object streams.
- Javagetting Started 3256 2019-11-14 17:26:36
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- java what is instantiation
- The process of creating an object is called instantiation, so sometimes we also call an object an instance of a class. For example: "Demo demo = new Demo();".
- Javagetting Started 3760 2019-11-14 17:19:33
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- java what is distributed
- Distribution means distributing back-end work to multiple hosts through a computer network, and multiple hosts work together to complete the work. Technologies used in distributed applications: network communication, message-based inter-system communication and remote-call-based inter-system communication.
- Javagetting Started 4978 2019-11-14 17:10:48
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- How to package java
- First, right-click the project and select "Export", then select "JAR file". Then select the necessary files in the project and select the path to save the jar file package. Then click "Next", then "Next", and finally select "Finsh".
- Javagetting Started 2789 2019-11-14 17:00:05
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- How to initialize an array in java
- Array initialization is the process of making the array name point to the array object. This process is mainly divided into two steps. The first is to initialize the array object, that is, allocate memory space and assign values to the elements in the array. The second is to initialize the array name, that is Assign the array name to a reference to the array object. There are two ways to initialize an array, namely static initialization and dynamic initialization.
- Javagetting Started 15473 2019-11-14 16:40:15
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- How to call java interface
- First open Eclipse to create the project and package. Then create an interface and define interface methods. Then create the interface implementation class, name the class, implement the interface in the class, and override the interface methods. Create another class and define a constructor with parameters, using the interface type to define the parameters. Finally, define the method of the class, that is, use the interface variable to call the interface method.
- Javagetting Started 12613 2019-11-14 16:26:44
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- What is java polymorphism
- Polymorphism is the ability of the same behavior to have multiple different manifestations or shapes. Polymorphism is the same interface, using different instances to perform different operations. Polymorphism is the manifestation of multiple manifestations of an object.
- Javagetting Started 6372 2019-11-14 16:20:30
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- What to do if error 1603 occurs in Java
- jre is written in java and will call the java program to install it. Since the previous environment variables of java 1.7 still exist, jre cannot be installed and error 1603 is reported. Solution: Go to the environment variables and delete the previously configured java variables, then restart the computer and reinstall.
- Javagetting Started 6029 2019-11-14 16:11:27
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- What is the difference between java ee and java
- Java is an object-oriented programming language that can be used to write cross-platform application software. JavaEE refers to java enterprise edition, Java Enterprise Edition, which is mostly used for enterprise-level development, including web development and many other components.
- Javagetting Started 6249 2019-11-14 16:01:51
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