CÀI ĐẶT JAVA DEVELOPMENT ENVIRONMENT

1.1.1.     CÀI ĐẶT JAVA DEVELOPMENT ENVIRONMENT

 Cài đặt Java SE Development Kit (JDK)

a)    Tải jdk-7-linux-x64.rpm  từ địa chỉ http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.rpm hoặc và địa chỉ của Oracle (http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html)  

b)   Cài đặt JDK

[root@linux ~]#rpm -Uvh jdk-7-linux-x64.rpm

Preparing...      ########################################### [100%]

   1:jdk          ########################################### [100%]

Unpacking JAR files...

        rt.jar...

        jsse.jar...

        charsets.jar...

        tools.jar...

        localedata.jar...

[root@linux ~]#vi /etc/profile

# add at the last line

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

[root@linux ~]#source /etc/profile

c)   Test thử bằng cách tạo chương trình sau

[root@linux ~]#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);

   }

}

[root@linux ~]#javac day.java             # compile

[root@linux ~]#java day                   # execute

2011/7/30 21:7