OpenJDK 11 : Install2018/10/17 |
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Install OpenJDK 11 to configure Java development environment.
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| [1] | Install OpenJDK 11. Oracle JDK includes compiler but compiler for OpenJDK 11 is included in openjdk-devel. |
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[root@dlp ~]#
yum -y install java-11-openjdk java-11-openjdk-devel
[root@dlp ~]#
cat > /etc/profile.d/java11.sh <<EOF
export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which javac))))) export PATH=\$PATH:\$JAVA_HOME/bin EOF
[root@dlp ~]#
[root@dlp ~]# source /etc/profile.d/java11.sh
java --version openjdk 11.0.3 2019-04-16 LTS OpenJDK Runtime Environment 18.9 (build 11.0.3+7-LTS) OpenJDK 64-Bit Server VM 18.9 (build 11.0.3+7-LTS, mixed mode, sharing) |
| [2] | If another version of JDK had been installed, change the default like follows. |
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[root@dlp ~]# alternatives --config java
There are 2 programs which provide 'java'.
Selection Command
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1 java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.3.7-0.el7_6.x86_64/bin/java)
*+ 2 java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64/jre/bin/java)
Enter to keep the current selection[+], or type selection number: 1
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| [3] | Create a test program and make sure if it works normally. |
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[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);
}
}
# compile [root@dlp ~]# javac day.java # run [root@dlp ~]# java day 2019/6/13 19:22 |
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