Install OpenJDK 82016/09/28 |
Install OpenJDK 8 to configure Java development environment.
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[1] | Install OpenJDK 8. Oracle JDK includes compiler but compiler for OpenJDK 8 is included in openjdk-devel. |
[root@dlp ~]#
yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel
[root@dlp ~]#
[root@dlp ~]# cat > /etc/profile.d/java8.sh <<EOF
export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which javac))))) export PATH=\$PATH:\$JAVA_HOME/bin export CLASSPATH=.:\$JAVA_HOME/jre/lib:\$JAVA_HOME/lib:\$JAVA_HOME/lib/tools.jar EOF source /etc/profile.d/java8.sh
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[2] | If another version of JDK had been installed, change the default like follows. |
[root@dlp ~]# alternatives --config java There are 2 programs which provide 'java'. Selection Command ----------------------------------------------- 1 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-1.b14.el7.x86_64/jre/bin/java *+ 2 /usr/java/jdk1.8.0_71/jre/bin/java # select the latest one Enter to keep the current selection[+], or type selection number: 1 |
[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); } } # compile [root@dlp ~]# javac day.java # run [root@dlp ~]# java day 2016/9/30 19:46 |
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