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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 12980 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 23710 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 51466 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 3140 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 19383 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 4450 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 7177 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 5271 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 9124 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 9686 2020-05-08 11:52:57
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- What are the functions of javac and java in the Java tool set?
- javac is the Java compiler, responsible for converting Java source code into bytecode files; java is the Java interpreter, responsible for executing bytecode files. To run a java program, you need to first compile the Java source code into a bytecode file through javac, and then use java to execute the bytecode file.
- JavaBase 3993 2020-05-09 16:54:54
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- Briefly describe the concept of design patterns
- A design pattern is a summary of a categorized and cataloged code design experience that is used repeatedly, is known to most people, and is known by most people. It has nothing to do with specific language, it is a kind of thought. Design patterns are good programming methods summarized by programmers during the practice of software engineering.
- JavaBase 3169 2020-05-12 17:35:01
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- Why does jvm need performance tuning?
- During the testing or operation of the program before going online, some large and small JVM problems sometimes occur, such as excessive CPU load, request delay, reduced tps, etc., and even memory leaks and memory overflows leading to system crashes, so the JVM needs to be adjusted. Optimal, so that the program can obtain a higher user experience and operating efficiency under the premise of normal operation.
- JavaBase 4431 2020-05-12 18:16:50
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- What are the three major technology platforms of Java?
- The three major technology platforms of Java are: 1. Java SE Standard Edition, which is provided for developing ordinary desktop and business applications; 2. Java EE Enterprise Edition, which is provided for developing enterprise-level applications; 3. Java ME Small version, it is provided for developing electronic consumer products.
- JavaBase 4516 2020-05-14 17:28:31
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- What are the subdirectories after jdk installation?
- The subdirectories after jdk installation include jdk\bin (executable file directory), jdk\lib (class library directory), jdk\jre (the root directory of the Java runtime environment), jdk\demo (some examples that come with jdk) , jdk\include (c header file), etc.
- JavaBase 6652 2020-05-06 13:21:37
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