Kali 安装 jdk

1. 官网下载jdk-linux-x64.tar.gz

2. tar -xvzf jdk-linux-x64.tar.gz解压到当前目录

3. 然后复制到/usr/jdk

cp -r jdk1.8.0_201/ /usr/jdk

4. 编辑/etc/profile，加入如下命令以配置java的环境变量

复制以下内容追加到文件末尾

export JAVA_HOME=/usr/jdk
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH

5. 告诉系统JDK的位置，最后2行代码不是重复，是要执行2次

update-alternatives --install "/usr/bin/java" "java" "/usr/jdk/bin/java" 1
update-alternatives --install "/usr/bin/javac" "javac" "/usr/jdk/bin/javac" 1
update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/jdk/bin/javaws" 1
update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/jdk/bin/javaws" 1

6. 设置新的JDK为默认,代码也是执行2次

update-alternatives --set java /usr/jdk/bin/java
update-alternatives --set java /usr/jdk/bin/java

update-alternatives --set javac /usr/jdk/bin/javac
update-alternatives --set javac /usr/jdk/bin/javac

update-alternatives --set javaws /usr/jdk/bin/javaws
update-alternatives --set javaws /usr/jdk/bin/javaws

7. source /etc/profile: 重载Profile文件
8. 输入java -version，看到如下图则说明配置成功