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- What is the difference between java variables and constants
- The difference between Java variables and constants is: 1. In the Java coding standards, constant names are required to be in uppercase, and variable names are required to be in lowercase; 2. Constants can only be assigned once, and variables can be assigned multiple times; 3. Constants are used during the running of the program. It cannot be changed, variables can be changed.
- JavaBase 7847 2020-05-14 13:33:34
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- What is the difference between java interface and abstract class
- The difference between Java interfaces and abstract classes is: 1. Abstract classes can not only have abstract methods, but also instance methods. All methods in the interface are public abstract methods; 2. Subclasses use the extends keyword to inherit abstract classes, and subclasses Use the implements keyword to implement the interface.
- JavaBase 2457 2020-05-14 13:15:40
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- What are the four commonly used frameworks for java development?
- The four commonly used frameworks for Java development are: 1. SpringMVC, which implements the MVC design pattern; 2. Mybatis, which is an excellent persistence layer framework; 3. Spring, which provides IOC, AOP and other functions; 4. Maven , which is a project management tool.
- JavaBase 13149 2020-05-13 16:20:11
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- What are the keywords of java exception handling
- The keywords of java exception handling are: 1. try; 2. catch; 3. finally; 4. throw; 5. throws. All exception classes are subclasses inherited from the java.lang.Exception class.
- JavaBase 4089 2020-05-13 13:31:50
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- What technologies do you need to master for java back-end development?
- The technologies that need to be mastered in java back-end development include: 1. Servlet, Servlet plays the core role in the Web MVC structure; 2. JDBC, RMI, etc.; 3. Spring framework; 4. Combined with hadoop to build java distributed development.
- JavaBase 14902 2020-05-12 14:11:01
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- What is the difference between int and double in java
- The difference between int and double in Java: 1. The int data type is 32 bits, and the double data type is 64 bits; 2. The default value of the int data type is 0, and the default value of the double data type is 0.0d; 3. Integer variables The default type is int, and the default type of floating point number is double type.
- JavaBase 13142 2020-05-12 10:56:43
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- What are the famous games developed by java?
- Famous games developed by java include: 1. Tetris; 2. Super Bubble Bobble; 3. Super Mario; 4. Pac-Man; 5. Diamond Love; 6. Zuma; 7. Bomberman; 8. Snake. ; 9. Prince of Persia; 10. The Sims.
- JavaBase 24351 2020-05-11 15:28:46
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- for input string: Why does it appear?
- "for input string" appears because of a formatting exception thrown when converting a string that does not conform to the numeric format into a number. The solution is to use "debug" or "print statement" to output the variable and correct the string into numeric format. That’s it.
- JavaBase 51863 2020-05-11 09:19:02
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- How to install jdk in win10 environment
- How to install jdk in win10 environment: 1. First download jdk from the official website; 2. Then install it according to the installation wizard; 3. Then set the environment variables CLASS_PATH, JAVA_HOME and PATH; 4. Finally, test whether the installation is successful.
- JavaBase 3277 2020-05-06 11:13:25
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- How to write input statement in java
- The input statement in java is written as follows: 1. [Scanner sc = new Scanner(System.in); ]; 2. [String input = sc.next();].
- JavaBase 19534 2020-04-30 16:42:09
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- what is java web
- Java Web is a technology stack that uses Java technology to solve related web and Internet fields. Java's client-side applications include java applets; Java's server-side applications are abundant, such as Servlet, JSP, and third-party frameworks.
- JavaBase 4583 2020-04-29 16:26:39
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- What are the commonly used frameworks in java development?
- Commonly used frameworks in Java development include: 1. SpringMVC, which is a lightweight web framework based on Java that implements the request-driven type of MVC design pattern; 2. Dubbo, which is a distributed framework for remote service invocation.
- JavaBase 7321 2020-04-28 16:04:20
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- What do you need to learn for java development?
- Java development needs to learn: 1. JavaSE, which is the basis of java development; 2. [html+css+javascript], which is the key technology for web page production; 3. mysql or oracle; 4. JDBC; 5. tomcat, Servlet and Jsp and other technologies; 6. Framework.
- JavaBase 5381 2020-04-28 10:02:56
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- What are the logical operators in java
- The logical operators in Java include logical AND (&&), logical OR (||) and logical NOT (!). Among them, logical AND (&&) and logical OR (||) are binary operators, and logical NOT (!) is a unary operator.
- JavaBase 9257 2020-05-08 16:45:51
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- What is the difference between abstract class and interface in java
- The differences between abstract classes and interfaces in Java are: 1. Abstract classes are modified with the abstract keyword, and interfaces are modified with the interface keyword; 2. Abstract classes do not need to contain abstract methods, and all methods in the interface are abstract methods.
- JavaBase 9822 2020-05-08 11:52:57
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