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- Java prompts that the system cannot find the solution to the specified path
- Java prompts that the system cannot find the solution to the specified path: 1. Check whether the file path is correct; 2. When using OutputStream, make sure that the folder must exist.
- JavaBase 11589 2019-11-11 17:57:41
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- Java prompts that the main class cannot be found or cannot be loaded
- The reason why java prompts that the main class cannot be found or cannot be loaded: The default address of the java instruction to find the class file is in the directory specified in the CLASSPATH environment variable. Solution: Use java package name + class name to execute.
- JavaBase 6018 2019-11-11 17:41:19
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- How to open exe file in java
- How to open an exe file in java: You can use Runtime.getRuntime().exec() to call the server command script for execution. We only need to pass the path of the exe file to exec.
- JavaBase 3800 2019-11-11 17:32:39
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- what is encapsulation in java
- Encapsulation in Java refers to a method of partially packaging and hiding the implementation details of an abstract functional interface. It can be considered as a protective barrier to prevent the code and data of this class from being randomly accessed by code defined by external classes.
- JavaBase 8263 2019-11-11 17:21:35
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- How to get time in java
- How to get time in java: first introduce the java.util.Date and java.text.SimpleDateFormat packages; then create a SimpleDateFormat object; finally call the format method and pass in new Date to format and output the current time.
- JavaBase 5571 2019-11-11 17:13:26
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- What are inner classes in java
- Inner classes in Java refer to classes defined inside a class. Inner classes can be divided into instance inner classes, static inner classes and member inner classes. Each inner class has its specific characteristics.
- JavaBase 3914 2019-11-12 09:32:54
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- what is serialization in java
- Serialization in Java is the process of converting Java objects into byte sequences. It is a mechanism used to process object streams. Serialization is mainly used to permanently save the byte sequence of an object to the hard disk.
- JavaBase 4276 2019-11-12 09:33:50
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- How to write files in java
- How to write a file in java: first create a FileWriter object; then use the write method of FileWriter to write data; finally use the close method of FileWriter to close it.
- JavaBase 5027 2019-11-11 16:35:52
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- Steps to connect java to database
- Steps to connect the database in java: 1. Create a new java project and folder libs; 2. Add the package to connect to the database in the libs folder; 3. Build the jar package on the path; 4. Connect the database in the java project; 5. Analysis of the reasons for failure to connect to the database.
- JavaBase 20830 2019-11-12 09:34:37
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- How to connect to database in java
- How to connect java to the database: 1. Download the mysql connection driver file; 2. Create a new java project and put the driver in it; 3. Add the driver jar file to the project Properties; 4. Use DriverManager to connect.
- JavaBase 18661 2019-11-11 16:16:40
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- What is the use of this in java
- The functions of this in Java are: 1. Using this when initializing data in a class is beneficial to reading and understanding; 2. This can call methods; 3. This can represent the currently executing object.
- JavaBase 3534 2019-11-11 15:56:56
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- What are the commonly used frameworks in Java?
- Commonly used frameworks in Java are: 1. SpringMVC, a lightweight web framework based on Java that implements the request-driven type of Web MVC design pattern; 2. Mybatis, an excellent persistence that supports ordinary SQL queries, stored procedures and advanced mapping. layer frame.
- JavaBase 8360 2019-11-11 15:43:54
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- What does this refer to in java
- This in Java refers to a reference, which points to the object of itself. The this keyword is used in the class method definition to represent a reference to the object using the method. Sometimes this can be used to handle the situation where member variables and parameters in the method have the same name.
- JavaBase 7553 2019-11-11 15:36:23
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- How to implement polymorphism in java
- The ways to achieve polymorphism in Java are: 1. Implement polymorphism through interfaces; 2. Implement polymorphism by inheriting parent classes and overriding methods; 3. Implement polymorphism by overloading methods in the same class.
- JavaBase 5217 2019-11-11 15:23:31
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- The difference between equals and == in java
- The differences between equals and == in Java are: 1. == compares whether two references point to the same object in memory; 2. equals is commonly used to compare whether the contents in the object are equal; 3. The equals method is composed of Object Provided by a class and can be overridden by subclasses.
- JavaBase 4398 2019-11-11 15:18:51
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