??最近在Linux上運(yùn)行java程序出現(xiàn)Unsupported major.minor version 51.0錯誤，后發(fā)現(xiàn)是編譯后的java程序與Linux上的java Se版本不一致而產(chǎn)生的錯誤。提示的版本號與Java se對應(yīng)表如下：
JavaSE 8 = 52 (0x34 hex),
JavaSE 7 = 51 (0x33 hex),
JavaSE 6 = 50 (0x32 hex),
JavaSE 5 = 49 (0x31 hex),
J2SE 1.4 = 48 (0x30 hex),
J2SE 1.3 = 47 (0x2F hex),
J2SE 1.2 = 46 (0x2E hex),
J2SE 1.1 = 45 (0x2D hex)
下面介紹一下Kali下JDK1.8的安裝過程
1、下載jdk安裝包
??點(diǎn)擊下面的鏈接選擇合適的JDK版本下載：
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
2、建立目錄，將下載的jdk復(fù)制過去并解壓
sudo mkdir -p /usr/local/java
sudo cp jdk-8u161-linux-x64.tar.gz /usr/local/java
cd /usr/local/java
sudo tar xzvf jdk-8u91-linux-x64.tar.gz
3、配置環(huán)境變量
sudo vim /etc/profile
###復(fù)制以下代碼到文件結(jié)尾
JAVA_HOME=/usr/local/java/jdk1.8.0_161
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH
4、通知系統(tǒng)java的位置
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_161/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_161/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_161/bin/javaws" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_161/bin/javaws" 1
5、設(shè)置默認(rèn)JDK
sudo update-alternatives --set java /usr/local/java/jdk1.8.0_161/bin/java
sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_161/bin/javac
sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_161/bin/javaws
6、重新載入profile
source /etc/profile
通過 java -version以及javac -version即可看到是否安裝完成
參考：http://blog.csdn.net/qq_29343201/article/details/51926430
