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What are the eight basic data types?

The eight basic data types are: 1. 4 integer types (byte, short, int, long); 2. 2 floating point types (float, double); 3. 1 character type "char"; 4. 1 A Boolean type "boolean".

Jul 02, 2021 pm 12:08 PM

java 基本数据类型

How to call webservice interface

Calling method: First select the "Project" tab, right-click the mouse, select "new"-"other" in the pop-up right-click menu, then find "web service client", click "next", and enter the interface in "wsdl url" address, and finally click "next" to generate the class file.

Jun 30, 2021 pm 01:44 PM

webservice

What are the causes and solutions of stack overflow?

Cause: The total capacity of the created objects exceeds the maximum capacity of the heap. Solution: If it is a memory leak, find the specific leak location according to the reference chain of the object that caused the overflow, and modify it; if it is a memory overflow, check the heap parameter settings of the JVM to check whether the life cycle of some objects is too long or the storage is too long. Issues such as unreasonable design will be corrected.

Jun 25, 2021 pm 02:33 PM

栈溢出 Java

What are the three major characteristics of java object-oriented

The three major characteristics of object-oriented Java: 1. Encapsulation, which aims to enhance data security and simplify programming; 2. Inheritance, which refers to extracting multiple identical properties and methods and creating a new parent class for the purpose of code reuse ; 3. Polymorphism, the purpose is to increase the flexibility of the code.

Jun 24, 2021 pm 01:40 PM

java 面向对象

How to retain two decimal places in java

Method: 1. Use the format method, the syntax is "String.format("%.2f", value)"; 2. Use the format method of DecimalFormat; 3. Use the setScale method for rounding; 4. Use the setMaximumFractionDigits method.

Jun 23, 2021 pm 01:58 PM

java

What is the difference between java and html

Differences: 1. HTML is the main front-end, presenting data, and Java is the main processing data. 2. JAVA is mainly used for the development of desktop applications and distributed network applications; HTML is used for the development of front-end pages. 3. The running environment of JAVA is JDK and WEB server, and the running environment of HTML is the browser.

Jun 21, 2021 pm 03:47 PM

java html

What to do if the main class cannot be found or loaded

Solution: 1. The classpath path is configured incorrectly, causing the class file to fail to load. You can reconfigure the classpath path; 2. The test code used is not under the same package, so you can put the code under the same package.

Jun 21, 2021 am 10:33 AM

java

How to understand the springboot framework

Spring Boot is a new framework provided by the Pivotal team. It is designed to simplify the initial construction and development process of new Spring applications. The framework uses an ad hoc approach to configuration, eliminating the need for developers to define boilerplate configurations.

Jun 18, 2021 am 10:47 AM

springboot框架的理解

How to use java random number random

In java, the usage of random is "static double random()". The "random()" method is used to return a random number. The range of random numbers is "0.0=<Math.random<1.0". This is a default method and does not accept any parameters.

Jun 16, 2021 pm 02:48 PM

java

How to remove html tags using java

In java, you can use the replaceAll method to remove html tags, the syntax format is "replaceAll (regular expression that matches this string, "")". The "replaceAll()" method replaces all substrings of the string that match the given regular expression using the given parameters.

Jun 08, 2021 pm 03:44 PM

java html标签

What data types can sharedpreferences store?

SharedPreferences can only save simple types of data, and can only store string, int, float, long and boolean data types. If you need to access more complex data types such as classes or images, you need to encode the data.

Jun 03, 2021 pm 02:51 PM

sharedpreferences 数据类型

What functions are needed to build a self-built RPC?

There are already many complete open source RPC architectures. If you want to understand how the program can run efficiently and stably, it is necessary to understand the process of RPC establishment. The self-construction process can be roughly divided into two parts, the communication part and the coordination part.

Jun 01, 2021 pm 12:56 PM

RPC

What are the several ways to implement scheduled tasks in Java?

How to implement scheduled tasks in java: 1. Use Java’s own “java.util.Timer” class, which allows you to schedule a “java.util.TimerTask” task; 2. Use Quartz; 3. Use Spring 3.0 to automatically Bring the task.

May 25, 2021 pm 02:18 PM

java 定时任务

What are the commonly used design patterns in Java?

Commonly used design patterns in Java: 1. Singleton mode; 2. Factory mode; 3. Builder mode; 4. Observer mode; 5. Adapter mode; 6. Agent mode; 7. Decoration mode.

May 25, 2021 pm 01:51 PM

java 设计模式