ubuntu configuration or replacement jdk, sdk

ubuntu replace jdk sdk
add in sudo gedit /etc/profile file

export JAVA_HOME=/usr/lib/jvm/jdk1.5.0_22
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/:${JAVA_HOME}/bin:$PATH

export ANDROID_HOME=/opt/android-studio
export PATH=$PATH:$ANDROID_HOME/bin
export SDK_HOME=/home/zjs/Android/Sdk
export PATH=$PATH:$SDK_HOME/tools:$SDK_HOME/platform-tools

Then

source /etc/profile
restart the device

Finally verify
java -version