Hello World! My first java program
IDEA installation
JDK: Java Development Kit (Development Tool Pack)
JRE: Java Runtime Envoironment (operating environment)
JVM: Java Virtual Machine (virtual machine)
Install
Install JDK
1. Download jdk8 and find the download address (
(Online download needs to be clicked and consent agreement)
2. Download the corresponding version of the computer, x64
3. Double -click to install (change the installation path)
4. Configure environment variables
-
Settings -> Search-> Environment variables
-
System variables -> New
Variable name: java_home
Value value: installation path
-
Configure Path variable
System variables -> PATH -> Double -click -> New
%JAVA_HOME%\bin
%JAVA_HOME%\jre\bin
-
Test whether JDK is successfully installed
Open CMD-> Java-Version
Uninstalled
1. Delete the installation directory of Java
2. Delete java_home
3. Delete the directory of Java under PATH
4.java-version
Hellow World!
-
new folder
-
Modify the file name: .java
public class hello{ public static void main (String[] args){ System.out.print("Hello World!"); } }- java is sensitive
- Please write in English
- The file name and class name must be consistent
- The code is ends and needs to be used:;
Intelligent Recommendation
My first C language program Hello World
My first C language program Hello World The declaration of integer variables is int, such as: Int a Single precision floating point declaration with float, such as Float B; Double-precision floating-p...
My first Go language program: Hello World
package main ：Define the name, you must specify which package belongs to this file in the source file, such as: package main. Package main represents a separately executable program, each GO applicati...
Hello World, my first Sping program
I recently learned the SPING framework. SPING is a lightweight IOC (control reversal) and AOP (facing cut programming) framework. It will be very easy and convenient to use it to help my Java developm...
The first Java program: Hello world
The public class is the main class. The source file naming must be consistent with the main class. A source file can only have one main class. But there can be many other classes. For example, class A...
The first Java program Hello World
1. Program development step description Three steps in Java program development:Write, compile, run. 2. Write the Hello World source program 2.1 Create a new text file. The full file name is changed t...
More Recommendation
The first Java program, Hello World
Eclipse development File-> New-> Java Project, in the prompt box, enter the Project Name, such as Hello, then next, finnsh. Hello will appear in the directory project, as shown below Right-src, ...
The first Java program --Hello World
No matter what language to learn, write the first program should start from Hello World. Although only a few simple lines of code, but just learning Java as a rookie, when I see myself writing program...
The first java program "hello world!"
Hello World Create a new folder to store the code In the folder below to create a new suffix .java java files, such as HelloWorld.java [Note To open the display system extension] [Note to write code c...
[Java] The first program "Hello World"
** The first program "Hello World" **...
The first Java program: Hello World!
The first Java program: Hello World! Create a new folder to store the code Create a new java file The file extension is .java Hello.java [Note] The system may not display the suffix name, you need to ...