How to write java in linux

How to write java in linux

##1. Environment installation

Since using the yum or apt-get command to install openjdk may have incomplete class libraries, which may lead to errors when users run related tools after installation, we recommend manual decompression and installation to install JDK. The specific steps are as follows:

1. Download JDK

Go to Oracle’s official website to download the appropriate JDK version and prepare for installation.

Note: You need to download the Linux version here. Here we take jdk-8u151-linux-x64.tar.gz as an example. The file you download may not be this version. This does not matter, as long as the suffix (.tar.gz) is the same.

2. Create a directory

Create a java directory in the /usr/ directory,

mkdir /usr/java
cd /usr/java

put the downloaded file jdk-8u151-linux-x64 .tar.gz is placed in the /usr/java/ directory.

3. Unzip JDK

tar -zxvf jdk-8u151-linux-x64.tar.gz

4. Set environment variables

Modify /etc/profile

Add the following content to the profile file and save it:

set java environment
JAVA_HOME=/usr/java/jdk1.8.0_151        
JRE_HOME=/usr/java/jdk1.8.0_151/jre     
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

Note: Please configure JAVA_HOME and JRE_HOME according to your actual installation path and JDK version.

Let the modification take effect:

source /etc/profile

5. Test

java -version

If the java version information is displayed, it means the JDK installation is successful:

java version "1.8.0_151"Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

2. Write java code and compile and run

1. Enter vim Helloworld.java to encode

After entering the vim interface, Press the i key to insert and edit

Enter the following:

public class Helloworld{
    public static void main(String[] args){
        System.out.print("Hello World!");
    }
}

Hold the esc key on the keyboard, then enter: wq to save and exit

2. Compile and run

javac HelloWorld.java // 编译Java类
java HelloWorld       // 执行Java类

The words Hello World! should appear on the screen.

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