JDK 8 : Install
JDK 8 : Install
2015/03/16
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Install Java SE Development Kit 8 (JDK8) and build Java Environment.
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| [1] | Download and install JDK 8. Make sure the latest version and source URL of JDK on Oracle download site. |
[root@dlp ~]#
[root@dlp ~]#
curl -LO -H "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/8u71-b15/jdk-8u71-linux-x64.rpm"
rpm -Uvh jdk-8u71-linux-x64.rpm
Preparing... ############################## [100%]
1:jdk1.8.0_71 ############################## [100%]
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
jfxrt.jar...
[root@dlp ~]#
vi /etc/profile
# add follows to the end
export JAVA_HOME=/usr/java/default
export PATH=$PATH:$JAVA_HOME/bin export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar
source /etc/profile
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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-1.8.0.65-3.b17.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: 2 |
| [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);
}
}
javac day.java
# compile
[root@dlp ~]#
java day
# run
2015/3/16 20:30 |
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