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- How to compile and run java program in terminal on mac system
- The method for Mac system to compile and run Java programs in the terminal is: first switch to the directory where the source program (written file with .java as suffix) is saved in the terminal, and then execute the [javac] command in the terminal to compile the source program. When completed, the [.class] file will be generated, and finally run the [java] command to run the program.
- Javagetting Started 6697 2019-12-09 16:27:08
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- How to import project in java
- First open eclipse, click "File" and select "Import". Then select "Existing Projects into Workspace" and click "Next". Click "Browse" again, select the imported project, click "OK", and select "Finish".
- Javagetting Started 3940 2019-12-09 16:10:01
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- How to use java in eclipse
- First open eclipse and select "file-new-Java project" in sequence. Then name the project, click on the project, and create a new Class in the src directory. In the pop-up box, fill in the name of the jave program and select Finish. Then write the program, press Ctrl+S to save, and click "Run".
- Javagetting Started 6889 2019-12-09 15:43:16
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- windows configuration java environment
- The method for configuring the Java environment in windows is: 1. First enter the advanced system setting options and click [Environment Variables]; 2. Then click [New] under [System Variables]; 3. Then create new [JAVA_HOME] and [classpath] variables; 4. Edit the [Path] variable; 5. Finally, test it.
- Javagetting Started 11778 2019-12-09 15:14:45
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- How to encrypt in java
- Two encryption methods in Java: Method 1: DES is a symmetric encryption algorithm. The so-called symmetric encryption algorithm is an algorithm that uses the same secret key for encryption and decryption. Method 2: Use MD5 encryption.
- Javagetting Started 3637 2019-12-09 15:15:54
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- Is null an object in java?
- "null" in "java" is neither an object nor a type. It is just a special value. You can assign it to any reference type. You can also convert "null" into any type. "null" is a keyword, and like "public" it is case-sensitive.
- Javagetting Started 2847 2019-12-06 14:34:27
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- Understanding of thread synchronization in java
- Thread synchronization in "java" actually refers to thread queuing. When multiple threads read and write the same shared resource at the same time, conflicts may occur. Therefore, several threads must queue up and operate the shared resources one by one. The operations are not performed simultaneously (i.e. thread synchronization).
- Javagetting Started 2561 2019-12-06 13:53:25
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- The difference and connection between instances and objects in java
- The difference and connection between instances and objects in "java" is: an object is an abstract statement. You can think of it as a representative of all instances that conform to its own definition, while an instance is the actual embodiment of an object. You can say that an instance is an object, but you cannot say that an object is an instance.
- Javagetting Started 3649 2019-12-06 13:42:21
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- How to implement interface in java
- To implement the interface in "java", you need to use the "implements" keyword, the format is: "modifier+class+class name+extends+parent class name+implements+interface list", where the modifier is an optional parameter, used to specify the access of the class Permissions; class name is a required parameter, used to specify the name of the class.
- Javagetting Started 6106 2019-12-05 15:41:53
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- What is recursion in java
- Recursion in "java" refers to the reentrancy phenomenon caused by a function, process or subroutine calling itself directly or indirectly during operation. Recursive algorithms are generally used to solve three types of problems, namely: 1. Fibonacci Problem; 2. Backtracking problem; 3. Tree traversal and graph search.
- Javagetting Started 3123 2019-12-05 15:13:12
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- what is api in java
- The "api" (application programming interface) in "java" refers to some predefined functions in "java", with the purpose of providing applications and developers with the ability to access a set of routines based on certain software or hardware. , without having to access the source code or understand the details of the inner workings.
- Javagetting Started 8673 2019-12-05 14:48:53
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- The difference between class methods and object methods in java
- The differences between class methods and object methods in "java" are: 1. Object methods must be called with objects, and class methods must be called with classes; 2. Properties can be directly accessed in object methods, but properties cannot be directly accessed in class methods; 3. , class methods will not change depending on the object created, but object methods will change depending on the object created.
- Javagetting Started 7851 2019-12-05 14:29:53
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- How to set java environment variables
- The method to set the "java" environment variable is: first enter the advanced system settings in the computer, open the environment variable settings, then create a new "JAVA_HOME" system variable, set its value to the installation path, then edit the "PATH" variable, and finally according to the actual situation , select whether to create a new "Classpath" variable.
- Javagetting Started 10596 2019-12-05 13:50:30
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- How to publish java project
- Projects in "java" can be released using the "jar" package. First package the project, open a command window in the directory where the project is located, execute the command "mvn package" to generate a "jar" package, and then ensure the "java" running environment If it is correct, just execute the project startup command to start the project.
- Javagetting Started 4412 2019-12-05 11:41:45
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- What is a thread in java
- The thread in "java" refers to an execution process in the process. Multiple threads can run in one process. For example: "java.exe" can run many threads in the process. Threads always belong to a certain process. Multiple threads in a process Threads share the memory of the process.
- Javagetting Started 3532 2019-12-04 16:03:14
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