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- What should I do if there is no servlet option when creating a new idea?
- Solution: First enter the "Configuration" page and mark "src" as a "Sources" file; then click the "facets" tab on the left side of the page and check the option ending with "src" in "sources root". Create a new servlet file in the file in the src directory.
- Javagetting Started 22756 2023-01-13 00:40:10
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- How to use coding standards and static code checking plug-ins
- This article will introduce you to coding standards and how to use static code checking plug-ins. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
- Javagetting Started 3514 2021-05-06 10:03:22
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- What is the difference between start method and run method in java thread
- Threads in Java are implemented through Java.lang.Thread. You can create a thread by instantiating a Thread object and then calling start() to start it. However, a specific method run() of Thread can also start a thread. So what is the difference between these two methods?
- Javagetting Started 3498 2021-05-01 12:04:04
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- Java batch inserts large amounts of data into mysql database
- The fastest and most effective way for Java to batch insert large amounts of data into a MySQL database is to use traditional JDBC insertion.
- Javagetting Started 10164 2021-05-01 12:00:26
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- What are the steps to connect to the database using jdbc?
- The steps for jdbc to connect to the database: 1. Load the jdbc driver; 2. Create a connection to the database; 3. Create a preparedStatement; 4. Execute the SQL statement; 5. Traverse the result set; 6. Handle the exception and close the JDBC object resource.
- Javagetting Started 99968 2023-01-13 00:40:09
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- What are the jvm garbage collection algorithms?
- JVM garbage collection algorithm: 1. "Mark-Clear" algorithm; first mark all objects that need to be recycled, and then uniformly collect all marked objects after the marking is completed. 2. Copy algorithm; divide the memory into two equal-sized blocks, and only use one of them at a time. 3. "Mark-Organization" algorithm; 4. Generational collection algorithm.
- Javagetting Started 33109 2023-01-13 00:40:09
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- How to solve javac is not an internal or external command, nor is it an operable program?
- Solution: 1. Download and install jdk; 2. In the environment variable interface, write the "JAVA_HOME" configuration path in full, write ".;%JAVA_HOME%\lib;" in the "CLASSPATH" configuration path, and "PATH" configuration Just write "%JAVA_HOME%\bin;" in the path.
- Javagetting Started 161789 2023-01-13 00:40:09
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- How to run java program
- Method: 1. Create a new java file containing program code in the desktop; 2. Open cmd and execute the "cd Desktop" command to enter the desktop; 3. Execute the "Java file name.java" command to compile; 4. Execute the "java file name" command to run the java program.
- Javagetting Started 152136 2023-01-13 00:40:09
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- What are the commonly used data structures in Java?
- Java data structures include: 1. Array; 2. Linked list, a recursive data structure; 3. Stack, which stores data according to the principles of "last in, first out" and "first in, last out"; 4. Queue; 5. Tree, It is a set of hierarchical relationships composed of n (n>0) limited nodes; 6. Heap; 7. Graph; 8. Hash table.
- Javagetting Started 43504 2023-01-13 00:40:09
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- What are the basic data types of java
- There are 8 basic data types in Java, namely: byte (bit), short (short integer), int (integer), long (long integer), float (single precision), double (double precision), char (character) and boolean.
- Javagetting Started 93561 2023-01-13 00:40:09
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- How to understand java polymorphism
- In Java, polymorphism is the ability of the same behavior to have multiple different manifestations or forms; polymorphism is the same interface, using different instances to perform different operations. The advantages of polymorphism: 1. Eliminate coupling relationships between types; 2. Replacement; 3. Extensibility; 4. Interface; 5. Flexibility; 6. Simplification.
- Javagetting Started 6706 2021-04-13 17:55:39
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- What is reflection in java
- In Java, reflection mainly refers to the ability of a program to access, detect, and modify its own state or behavior. The main functions of the Java reflection mechanism: 1. Determine the class to which any object belongs at runtime; 2. Construct an object of any class at runtime; 3. Call the method of any object at runtime, etc.
- Javagetting Started 18636 2023-01-13 00:40:09
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- How to define variables in java
- In Java, variables can be defined through the statement "data type identifier;" or "data type identifier = initialization value;"; the identifier is also called the variable name, which consists of numbers (0~9), uppercase and lowercase letters, and underscores , dollar sign ($), RMB sign (¥) and all ASCII codes before hexadecimal 0xc0.
- Javagetting Started 7470 2021-04-13 19:05:07
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- Is there a public class required in a java source file?
- Yes, there can be only one public class in a source file. Because each compilation unit (file) can only have one public class, that is, each compilation unit has a single public interface, represented by a public class; this interface can contain numerous classes that support package access permissions as required.
- Javagetting Started 16009 2023-01-13 00:40:08
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- What are the java data structures?
- Java data structures include: 1. List; 2. Vector; 3. ArrayList; 4. LinkedList; 5. Set; 6. HashSet; 7. LinkedHashSet; 8. SortedSet; 9. Map; 10. HashMap.
- Javagetting Started 22118 2023-01-13 00:40:08
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