1, If Else…
val x = 5
val s = if (x > 0) 1 else -1 // s type is Int
val m = if (x > 0) "positive" else -1 // Public super type Any with s type String and Int
// In Scala, each expression should have a value. If the else part is missing, the following statement is equivalent to: if (x > 0) 1 else(), which returns a null ...
Posted on Fri, 15 May 2020 11:08:22 -0400 by mrjap1
Built in annotations
Class loading process
Reflection gets the structure information of the runtime class
Creating objects dynamically
Create objects by reflection (general)
Create an object with constructor ob ...
Posted on Mon, 06 Apr 2020 01:09:04 -0400 by gumby51
We define the roles of the main classes:
Spring classloader: when this class is set as the default classloader of the main thread, all subsequent classes will be loaded, and class loading scheduling will be performed (if the parent classloader is not loaded into this class, it will be handed over to ServiceClassLoader for loading)
Posted on Wed, 01 Apr 2020 04:00:09 -0400 by mort
There are a lot of articles on the Internet saying solutions, but they don't analyze the reasons. The solution is idea settings
Add - Dfile.encoding=GBK or GB2312 to VM Options, so the garbled code will be the correct Chinese character, BUT!!!, why?
-How does idea interact with maven
C:\Java\jdk1.8.0_162\bin\java.exe -Dmaven.mult ...
Posted on Mon, 30 Mar 2020 23:59:19 -0400 by diesel
(1) Object class(two) class Date(3) Calendar Class(4) System class(5) StringBuilder class(6) Basic type packaging
(1) Object class
The java.lang.Object class is the root class in the Java language, that is, the parent class of all classes.
All method subclasses describ ...
Posted on Sun, 23 Feb 2020 03:09:06 -0500 by burhankhan
When you write Java code, repetitive operations are often involved, so it's good to think of a plug-in like this. If it's a scenario everyone will encounter, the IDE may have already provided it, or someone else may have written it.If this is unique to your coding environment, you will have to write your own tools.So here's how to write IDEA pl ...
Posted on Fri, 07 Feb 2020 21:51:31 -0500 by hasitha
What is serialization and deserialization?
Serialization: converting objects into streams, saving them to disk, or transferring them to the network.
Deserialization: that is, to invert this stream back to the object.
So what's the use of serialization?
1) Permanently save objects on disk
2) Serializat ...
Posted on Wed, 29 Jan 2020 09:41:17 -0500 by modplod
Welcome to spring cloud. In this chapter, we will teach you how to create the parent-child project architecture of spring cloud.
Knowledge is endless, and stories are good or bad. Articles are purely fictional. Welcome to Tucao.
How can I walk in the Jianghu without any tricks. The technologies and tool ...
Posted on Wed, 29 Jan 2020 06:51:57 -0500 by itworks
1, Environmental preparation
1. Install JUnitGenerator
2. Add JUnit.jar package to the project
2, Write test code
1. Write test class in src directory
2. Write a test class in the test directory (if not, create a new test and set it to Test Resources Root)
3. Create a new Test ru ...
Posted on Sun, 12 Jan 2020 01:37:11 -0500 by abhinic
Change from: https://blog.csdn.net/wangyuanjun008/article/details/79233491
Method: crack patch activation method
(1) Download the crack patch Click me to download (password jilt)
Put the downloaded crack patch under the bin directory under your installation IDEA (as shown in the figure). The example of this article is e: \ ...
Posted on Thu, 02 Jan 2020 23:52:57 -0500 by jeff2007XP