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                            #### JRE
java程序的運行時環境，包含JVM和運行時所需要的核心類庫

#### JDK
java程序開發工具包，包含JRE和開發人員使用的工具

### Linux下安裝JDK
```
1.下載
wget https://download.java.net/java/early_access/jdk8/b03/BCL/jdk-8u202-ea-bin-b03-linux-x64-07_nov_2018.tar.gz

2.  解壓 
tar zxvf jdk-8u191-linux-x64.tar.gz -C /usr/local

3. 環境變量
vi /etc/profile
export JAVA_HOME=/usr/local/src/java/jdk1.8.0_201   
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar  
export PATH=$PATH:$JAVA_HOME/bin

vi /etc/profile
export JAVA_HOME=/usr/local/src/jdk/jdk1.8.0_191 
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar  
export PATH=$PATH:$JAVA_HOME/bin

4. source /etc/profile 使文件立即生效

5. java -version 檢測是否安裝成功
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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