Install JDK 8 in CentOS

Install JDK 8 in CentOS

Install JDK 8 in CentOS

Install JDK 8

1. Go to renewal.

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

3. Execute the command tar zxvf jdk-8u60-linux-x64.tar.gz for decompression, decompress the/usr/java directory and add the jdk1.8.0 _ 60 folder.

4. After completing the preceding steps, JDK installation is complete. Configure the environment variables.

Configure Environment Variables

1. Run vim/etc/profile to edit the profile file.

2. Add the following content at the bottom of/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. The environment variable configuration is complete. Note that $ JAVA_HOME/bin must be placed in front of the PATH during configuration. Otherwise, when using java commands, the system will find the previous java and will not look down. In this way, the directory for running the java executable file is not under $ JAVA_HOME/bin, but under other directories, it will cause a lot of problems.

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

Command Test

1. If you use the javac command, the command not found error will not occur.

2. If java-version is used, the version is java version "1.8.0 _ 60 ".

3. Check whether your configuration is correct.

Echo $ JAVA_HOME

Echo $ CLASSPATH

Echo $ PATH

Code Testing

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

Public class Hello {
Public static void main (String [] args ){
System. out. println ("Hello World ");
}
}

Run the following command. If the following result is displayed, jdk installation is complete.

# Javac Hello. java
# Java-cp. Hello

Hello World

Of course, the jdk8 we have installed should test the features of jdk8. You can use the stream unique to JDK 8 for testing. The Code is 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 ");
MyList. stream (). filter (x-> x. contains ("a"). map (x-> x. toUpperCase ())
. ForEach (x-> System. out. println (x ));
}
}

Run the following command. The result shows that the installation is correct.

# Javac TestLambda. java
# Java-cp. TestLambda

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