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JDK 版本（jdk1.7.0_21 和 jdk1.7.0_55）

安装和配置如下。

jdk1.7.0_21

update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0_21/bin/java" 1

update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_21/bin/javac" 1

update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0_21/bin/javaws" 1

sudo chmod a+x /usr/bin/java 
sudo chmod a+x /usr/bin/javac 
sudo chmod a+x /usr/bin/javaws
sudo chown -R root:root /usr/lib/jvm/jdk1.7.0_21

jdk1.7.0_55

update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0_55/bin/java" 1

update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_55/bin/javac" 1

update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0_55/bin/javaws" 1
sudo chmod a+x /usr/bin/java 
sudo chmod a+x /usr/bin/javac 
sudo chmod a+x /usr/bin/javaws
sudo chown -R root:root /usr/lib/jvm/jdk1.7.0_55

我正在选择/更改默认 JDK

update-alternatives …