作者：hyl7758521_948 | 来源：互联网 | 2023-07-27 21:41
https://www.server-world.info/en/note?os=CentOS_7&p=jdk11&f=2
OpenJDK 11 : Install
2018/10/17
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Install OpenJDK 11 to configure Java development environment.
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| [1] |
Install OpenJDK 11.
Make sure the latest version and source URL of JDK on download site.
⇒ http://jdk.java.net/11/
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[root@dlp ~]#
curl -O https://download.java.net/java/GA/jdk11/13/GPL/openjdk-11.0.1_linux-x64_bin.tar.gz
tar zxvf openjdk-11.0.1_linux-x64_bin.tar.gz
[root@dlp ~]#
mv jdk-11.0.1 /usr/local/
[root@dlp ~]#
vi /etc/profile.d/jdk11.sh
# create new
export JAVA_HOME=/usr/local/jdk-11.0.1
export PATH=$PATH:$JAVA_HOME/bin
[root@dlp ~]#
source /etc/profile.d/jdk11.sh
[root@dlp ~]#
java -version
openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)
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| [2] |
If another version of JDK had been installed, change the default like follows. |
| [root@dlp ~]#
alternatives --config java
There is 1 program that provides 'java'.
Selection Command
-----------------------------------------------
*+ 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64/jre/bin/java)
[root@dlp ~]#
alternatives --install /usr/bin/java java $JAVA_HOME/bin/java 2
[root@dlp ~]#
alternatives --config java
There are 2 programs which provide 'java'.
Selection Command
-----------------------------------------------
*+ 1 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64/jre/bin/java)
2 /usr/local/jdk-11.0.1/bin/java
Enter to keep the current selection[+], or type selection number: 2
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| [3] |
Create a test program and make sure if it works normally. |
[root@dlp ~]#
vi day.java
import java.util.Calendar;
class day {
public static void main(String[] args) {
Calendar cal = Calendar.getInstance();
int year = cal.get(Calendar.YEAR);
int mOnth= cal.get(Calendar.MONTH) + 1;
int day = cal.get(Calendar.DATE);
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
System.out.println(year + "/" + month + "/" + day + " " + hour + ":" + minute);
}
}
# possible to run java file
[root@dlp ~]#
java day.java
2018/10/16 19:48
# also possible to run after compile
[root@dlp ~]#
javac day.java
[root@dlp ~]#
java day
2018/10/16 19:50
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