Installing the JDK8 under CentOS

Installing JDK8

1. Go to http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html to download the JDK installation file jdk-8u60-linux-x64.tar.gz.

2. Create a new/usr/java folder, place the jdk-8u60-linux-x64.tar.gz under the folder, and switch to the/usr/java directory.

3. Execute the command tar zxvf jdk-8u60-linux-x64.tar.gz to extract the Jdk1.8.0_60 folder after extracting/usr/java directory.

4. Through the above steps, the JDK installation is complete. The following begins configuring environment variables.
   

Configuring Environment variables

1. Executes the command Vim/etc/profile edit the profile file.

2. Add the following at the bottom of the/etc/profile:
   Java_home=/usr/java/jdk1.8.0_60
   Path= $JAVA _home/bin: $PATH
   Classpath= $JAVA _home/jre/lib/ext: $JAVA _home/lib/tools.jar
   Export PATH java_home CLASSPATH

3. Above, the environment variable configuration is complete. Note that the path in the configuration, it is necessary to put $java_home/bin in front, or use the Java command, the system will find the previous Java, do not look down. In this way, the JAVA executable file run directory is not $java_home/bin, and in other directories, will cause a lot of problems.

4. Execute command source/etc/profile the profile file to take effect immediately.
   

Command test

1. With the Javac command, no command not found error occurs.

2. With Java-version, a version of Java Edition "1.8.0_60" appears.

3. See if your configuration is correct.
   Echo $JAVA _home
   Echo $CLASSPATH
   Echo $PATH
   

Code testing

Create a new file Hello.java in your own working directory. Write the following content:

public class hello{public static void Main (string[] args) {System.out.println ("Hello World"); }     }

Execute the command below and if you get the following result, the JDK installation is complete.

# Javac Hello.java # JAVA-CP. Hello

Hello World

Of course, we installed the JDK8, should test the characteristics of the JDK8. You can use the JDK8-specific stream to test the code as follows:

Import java.util.arrays;   import java.util.iterator;    import  java.util.List;    import java.util.function.Consumer;     import java.util.function.function;    import java.util.function.predicate; public class testlambda {            Public static void main (String[] args)  {                         //  aggregate operations                     list<string> mylist = arrays.aslist ("Zhangsan",  "Lisi",  "Wangwu",             "Liuliu");      &nBsp;              mylist.stream (). Filter (X -> x.contains ("a")). Map (X -> x.touppercase ())                .foreach (X&NBSP;-&GT;&NBSP;SYSTEM.OUT.PRINTLN (x));     }}

Run with the following command to get the results, stating that there is no problem with the installation.

# Javac Testlambda.java # JAVA-CP. Testlambda

Zhangsan
Wangwu

This article is from the SQL Server deep dives blog, so be sure to keep this source http://ultrasql.blog.51cto.com/9591438/1694884

Installing the JDK8 under CentOS