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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.

May 12, 2020 am 10:56 AM

double int java

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.

May 11, 2020 pm 03:28 PM

java game

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.

May 11, 2020 am 09:19 AM

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.

May 06, 2020 am 11:13 AM

jdk win10

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();].

Apr 30, 2020 pm 04:42 PM

java

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.

Apr 29, 2020 pm 03:25 PM

java web

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.

Apr 28, 2020 pm 04:04 PM

java frame

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.

Apr 28, 2020 am 10:02 AM

java development

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.

Apr 27, 2020 pm 02:34 PM

java Logical Operators

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.

Apr 27, 2020 pm 01:19 PM

java abstract class interface

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.

Apr 23, 2020 pm 02:52 PM

java javac

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.

Apr 22, 2020 am 10:08 AM

Design Patterns

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.

Apr 21, 2020 pm 03:21 PM

java jvm

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.

Apr 20, 2020 am 09:46 AM

java Technology platform