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How to use tostring method in java

The method of using tostring in java is: 1. The Object class has a toString() method, and every class created will inherit this method; 2. It returns a String representation of the object, and is very helpful for debugging; 3. For the default The toString() method is often not satisfied.

Jun 16, 2020 pm 05:16 PM

java

The internal structure and operating mechanism of JVM

JVM is the abbreviation of Java Virtual Machine. JVM is a specification for computing devices. It is a fictitious computer that is implemented by simulating various computer functions on an actual computer.

Jun 16, 2020 pm 04:23 PM

java jvm

Transaction processing in JAVA

A transaction is a sequence of operations to access the database. The database application system completes access to the database through transaction sets. The correct execution of transactions causes the database to transition from one state to another.

Jun 16, 2020 pm 04:12 PM

java

What are the eight basic data types in java

The eight basic data types in Java are: int, short, float, double, long, boolean, byte, and char. Values ??in Java are all signed, there are no unsigned numbers, and their value ranges are fixed.

Jun 16, 2020 pm 02:35 PM

java Basic data types

What does the import java.util.* statement mean?

The import java.util.* statement means to import all classes under this package into the program. "*" represents a wildcard character, including all classes of util. Import also has an import statement, which is a single-type import, such as [import java.util.ArratList].

Jun 16, 2020 pm 01:49 PM

import java

What is springmvc workflow

The springmvc workflow is: first, the user sends a request to the server, and the request will first go to the front-end controller DispatcherServlet; then the ModelAndView is handed over to the ViewReslover view parser for analysis; then the real view is returned; and finally the result is responded to the user.

Jun 15, 2020 pm 03:40 PM

java

What are the built-in objects in jsp? What are their functions?

The built-in objects and functions of jsp are: 1. The Request object of the HttpServletRequet class, which represents the request object; 2. The Response object of the HttpSevletResponse class, which represents the response object and is mainly used to send data to the client.

Jun 15, 2020 pm 02:19 PM

jsp

What is the function of thread.sleep?

The function of thread.sleep is to trigger the operating system to immediately restart the CPU competition. The result of the competition may be that the current thread still obtains CPU control, or it may be replaced by another thread to obtain CPU control.

Jun 15, 2020 am 11:52 AM

java

What can java do

Java is mainly divided into three parts: javaSE, javaME, and javaEE. The application scenarios are: 1. Making stand-alone software; 2. Developing Web-based systems to provide solutions for various Internet applications and large and complex projects; 3. Used to develop software for games, electronic devices, mobile phones, etc.

Jun 13, 2020 pm 04:34 PM

java

What is the implementation principle of java annotations

The essence of annotation in Java is a special interface that inherits Annotation. Its implementation principle is that when annotations are obtained through reflection, the dynamic proxy object [$Proxy] generated by the Java runtime is returned, and the custom annotation method is called through the proxy object. The invoke method will eventually be called.

Jun 13, 2020 pm 02:39 PM

java annotation

random.nextint() detailed explanation

Usage of [random.nextint()]: 1. [nextInt()] without parameters will generate all valid integers; 2. [nextInt(int x)] with parameters will generate a range from 0~x [ Excluding any positive integer within X]; 3. Generate an integer within the specified range.

Jun 13, 2020 pm 02:15 PM

java

What is the usage of java regular expressions

The usage of java regular expressions is: 1. The use of Matcher class, used for string verification; 2. The use of Matcher class, used for string replacement; 3. The use of Pattern class, used for string splitting; 4. Use regular expressions to determine whether a string is legal.

Jun 13, 2020 am 11:02 AM

java

Introduction to Spring Boot framework

SpringBoot is the starting point for all projects developed based on Spring. Its design purpose is to allow developers to build Spring applications as quickly as possible and to reduce configuration files as much as possible. To put it simply, SpringBoot is not a framework, but a tool. .

Jun 13, 2020 am 10:19 AM

java

Is java front-end or back-end?

Java is used for back-end, but based on Java, you can write Android framework, and the interface is also the so-called front-end. In fact, any language can be used for front-end and back-end, but there is a question of which aspect is better.

Jun 12, 2020 am 11:24 AM

java