JDK download installation configuration, write the first Java program

What is a JDK?

A) JDK full name Java Development Kit Chinese Developer kit

b) JDK includes the JRE (Java Runtime Environment) Java Runtime Environment, a stack of Java tools, and a Java-based class library

Tools for Java:

java compiler: Javac.exe

Java Interpreter executor: Java.exe

1.JDK Download: Go to the official website download page, the URL is as follows:

Http://www.oracle.com/technetwork/cn/java/javase/downloads/jdk8-downloads-2133151-zhs.html

2. You must click Accept License agreement to download, select download according to system type

3. Next is to install the JDK, double-click the downloaded EXE file

4. Then install the JRE

5. Installation Complete

6. Configure Environment variables

Right-click Computer, properties, advanced system settings, environment variables, click the path variable, case-insensitive, no new

Copy the bin path of the JDK into the path variable

All Click OK

7. Check if the configuration is successful: windows+r open a command prompt, enter Java, enter Javac, and the following interface shows the configuration is successful.

8. Write the first Java program Hello world!

Create a new Notepad file

Change the prefix name to Java

Open with editor, write code:

public class Hello

{

public static void Main (String args[])

{

System.out.println ("Hello world!");

}

}

9. Compile: Go to the console, switch to the folder where the file is located, enter: Javac Hello.java

10. Execute, enter Java Hello

JDK download installation configuration, write the first Java program