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- Why is simpledateformat thread unsafe?
- Reason: In a multi-threaded environment, when multiple threads use the same SimpleDateFormat object (such as static modification) at the same time, such as calling the format method, multiple threads will call the calender.setTime method at the same time, causing time to be modified by other threads. Therefore threads are not safe.
- JavaBase 17444 2023-01-13 00:39:56
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- What is the use of java compareto method
- In Java, the compareTo() method is used to compare the Number object with the parameters of the method. The syntax format is "variable 1.compareTo(variable 2)"; the compareTo() method starts the comparison from the first position of the value. If it encounters a different characters, the difference in the ASCII values of these two characters is returned.
- JavaBase 17422 2023-01-13 00:39:56
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- How to set utf8 encoding in eclipse
- Setting method: First open the eclipse software; then click the "Window"-"Preferences"-"General"-"Workspace" option; finally, in the opened interface, find the "Text file encoding" item and select the "UTF-8" format That’s it.
- JavaBase 32157 2023-01-13 00:39:56
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- What are java static variables
- In Java, static variables refer to variables of classes modified by static; static variables are shared by all class instance objects, have only one copy in memory, and will be initialized when and only when the class is first loaded.
- JavaBase 23004 2023-01-13 00:39:56
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- How to convert string to char array in java
- In Java, you can use the toCharArray() method to convert a string into a char character array. The syntax format is "String variable.toCharArray()" and the return value is a character array.
- JavaBase 15963 2023-01-13 00:39:55
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- What are the java output statements?
- The output statements are: 1. Print "System.out.println()" with line breaks; 2. Print "System.out.print()" without line breaks; 3. Byte output "System.out.write()"; 4. Output "System.out.printf()" in format.
- JavaBase 30933 2023-01-13 00:39:55
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- How to set eclipse language to Chinese
- Method: 1. Find the language pack download URL and copy it; 2. Open eclipse and click "help" - "Install New Software" - "Add"; 3. Paste the URL in "Location" and click "Add"; 4 , check "Simplified Chinese Package"; 5. Wait for loading to complete and restart.
- JavaBase 198280 2023-01-13 00:39:55
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- What is the difference between static methods and non-static methods in java
- Differences: 1. Static methods are methods modified with the static keyword, which belong to classes, not objects; non-static methods are ordinary methods that are not modified with the static keyword, and belong to objects, not classes. 2. Static methods can be called directly, class name calls and object calls; non-static methods can only be called through objects. 3. Different life cycles.
- JavaBase 29252 2023-01-13 00:39:55
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- What are the shortcut keys for IDEA?
- This article will introduce to you the shortcut keys of IDEA. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
- JavaBase 2153 2021-05-06 09:45:33
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- How to decompile class files into java files
- Method: 1. Download the "jad.exe" plug-in and place it in the same directory as the ".class" file; 2. Open the cmd command window and use the cd command to enter the directory where "Jad.exe" is located; 3. Execute "Jad -d java file storage path -sjava class file path" command can be used.
- JavaBase 29198 2023-01-13 00:39:55
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- What are the seven major components of Spring Cloud?
- Seven major components of Spring Cloud: 1. Eureka component, which describes how the service is registered and where to register it; 2. Ribbon component; 3. Feign component, a declaration web service client; 4. Hystrix component; 5. Config component; 6 , Zuul component; 7. Bus component.
- JavaBase 23205 2023-01-13 00:39:55
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- How to create objects in java
- Methods for creating objects in Java: 1. Use the new keyword; 2. Use the newInstance method of the Class class, which can call the constructor without parameters to create objects; 3. Use the newInstance method of the Constructor class; 4. Use the clone method; 5. Use Deserialize.
- JavaBase 26701 2023-01-13 00:39:55
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- What are the methods to convert string to date in java
- Conversion method: 1. Use SimpleDateFormat to format the time; 2. Use "org.apache.commons.lang3.time.DateUtils" to format the time; 3. Use DateTimeFormatter to format the time.
- JavaBase 70203 2023-01-13 00:39:54
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- What is the use of split() method in java
- In Java, the split() method can split a string based on matching a given regular expression, and then return a string array, the syntax is "stringObject.split(regular expression delimiter, number of splits)"; if There are multiple delimiters, you can use "|" as a hyphen.
- JavaBase 9898 2023-01-13 00:39:54
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- What are the three major systems of java?
- JAVA has three major systems, namely: 1. Java SE, including Java basic class libraries and syntax; 2. Java EE, based on Java SE, defines a series of services, APIs, protocols, etc., and adds the ability to write enterprise-level Application class library; 3. Java ME.
- JavaBase 26346 2023-01-13 00:39:54
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