第一步:添加JDK7的源
# Step 1: Add the repository for JDK 7.
sudo apt-add-repository ppa:webupd8team/java
第二步:更新
# Step 2: Update
sudo apt-get update
第三步:安装JDK及附加组件
# Step 3: Install JDK and associated utilities
sudo apt-get install oracle-java7-installer
第四步:设置默认编译器
# Step 4: Set the default java interpreter used by the system.
sudo update-alternatives --config java
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