Linux install JDK, Eclipse
table of Contents
Article Directory
1. Environmental preparation
The premise is to configure the network ip first
1. Download Eclipse-Linux
https://www.eclipse.org/downloads/packages/
2. Download JDK
Official website download address: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
3. Download the SSH Secure File Transfer Client connection tool or MobaXterm
A: The head of any beast on the Internet;
Two, unzip and install
1. Use the tool wind10 -> Linux to transfer files
file—connect—hostName (linux ip)—user name (system user)—prot (port: default)—authentication (select password)—after clicking connect—input the password
Select and click the right mouse button—Upload----->
2. Contos deletes its own jdk
//检查jdk
rpm -qa | grep java
rpm 管理套件
-qa 使用询问模式，查询所有套件
grep 查找文件里符合条件的字符串
java 查找包含java字符串的文件
delete
只删除这几个
java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
//删除命令
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
rpm 管理套件
-e 删除指定的套件
--nodeps 不验证套件档的相互关联性
//检查
java -version
3.Ubuntu uninstall jdk
#查看java安装路径：
root@hdas:/home/kong# which java
/data/rj/jdk/bin/java
#其他jvm地址：
/usr/lib/jvm
-----------------------------------
#删除指令：
sudo apt-get remove openjdk* 在输入openj后可以按Tab键查看提示
root@de:/home/af# sudo apt-get remove openj
openjdk-11-jre openjdk-8-jre-headless
openjdk-11-jre-headless openjfx
root@de:/home/af# sudo apt-get remove openjdk*
*****
解压缩后将会空出 583 MB 的空间。
您希望继续执行吗？ [Y/n] y
****
4. Unzip the file in Linux
[root@yu local]# tar -zxvf 【文件名】【目标路径】 【eclipse】新名称
[root@yu local]# tar -zxvf 【文件名】【目标路径】 【jdk】新名称
//查看
[root@yu local]# ll
总用量 48
drwxrwxr-x. 8 root root 4096 12月 12 23:25 eclipse
drwxr-xr-x. 7 10 143 4096 12月 16 2018 jdk
Three, configure environment variables
open a file
vim /etc/profile
//在最下面添加，按i 开始编辑：
export JAVA_HOME=/opt/jdk
export CLASSPATH=.:${
JAVA_HOME}/jre/lib/rt.jar:${
JAVA_HOME}/lib/dt.jar:${
JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${
JAVA_HOME}/bin:${
JAVA_HOME}/jre/bin
//保存退出
esc > shift+: > 输入wq > 回车键
Refresh configuration
source /etc/profile
View java
[root@yu /]# java -version
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)
//
[root@yu /]# java
用法: java [-options] class [args...]
(执行类)
或 java [-options] -jar jarfile [args...]
(执行 jar 文件)
4. Test and run hello world. java program
Create a java file
[root@yu eclipse]# touch HelloWorld.java
Write java code file
[root@yu eclipse]# vim HelloWorld.java
//内容如下
public class HelloWorld {
public static void main(String[] agrs){
System.out.println("Hello World");
}
}
Compile the java file
[root@yu eclipse]# javac HelloWorld.java
Run file
[root@yu eclipse]# java HelloWorld
//运行结果
Hello World
This is so spicy