JDK 8 : Install2016/01/20 |
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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. |
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root@dlp:~#
curl -LO -H "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/8u71-b15/jdk-8u71-linux-x64.tar.gz"
root@dlp:~#
tar zxvf jdk-8u71-linux-x64.tar.gz root@dlp:~# mkdir /usr/java root@dlp:~# mv jdk1.8.0_71 /usr/java/jdk1.8.0_71
root@dlp:~#
vi /etc/profile # add follows to the end
export JAVA_HOME=/usr/java/jdk1.8.0_71 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. |
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root@dlp:~#
root@dlp:~# update-alternatives --install "/usr/bin/java" "java" "/usr/java/jdk1.8.0_71/bin/java" 1 root@dlp:~# update-alternatives --install "/usr/bin/javac" "javac" "/usr/java/jdk1.8.0_71/bin/javac" 1 root@dlp:~# update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/java/jdk1.8.0_71/bin/javaws" 1
update-alternatives --config java There are 2 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ * 0 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 auto mode 1 /usr/java/jdk1.8.0_71/bin/java 1 manual mode 2 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 manual mode # select the latest one Press enter to keep the current choice[*], or type selection number: 1 update-alternatives: using /usr/java/jdk1.8.0_71/bin/java to provide /usr/bin/java (java) in manual mode # change like above, too root@dlp:~# update-alternatives --config javac root@dlp:~# update-alternatives --config javaws |
| [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);
}
}
javac day.java # compile root@dlp:~# java day # run 2016/1/18 19:13 |