1. 下載下傳相應版本的jdk,解壓後移動到/opt 目錄
2. 設定環境變量:修改/etc/profile 檔案,
執行指令: sudo gedit /etc/profile
在末尾添加:
export JAVA_HOME=/opt/jdk1.7.0_21
export CLASSPATH=.:$JAVA_HOME/lib
export PATH=$JAVA_HOME/bin:$PATH
3.将所安裝的jdk設定成預設的java版本(原來的openJDK):
執行代碼:
sudo update-alternatives --install /usr/bin/java java /opt/jdk1.7.0_21/bin/java 300 &&
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_21/bin/javac 300 &&
sudo update-alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_21/bin/jar 300 &&
sudo update-alternatives --install /usr/bin/javah javah /opt/jdk1.7.0_21/bin/javah 300 &&
sudo update-alternatives --install /usr/bin/javap javap /opt/jdk1.7.0_21/bin/javap 300