ubuntu安装jdk

1.chmod 777 jdk-xx.bin
2.sudo ./jdk-xx.bin
3.vi /etc/environment

  PATH=":${JAVA_HOME}/bin:${JRE_HOME}/bin"
  JAVA_HOME=/home/jdk1.6.0_45/
  JRE_HOME=${JAVA_HOME}/jre
  CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib


4.source /etc/environment
5.update-alternatives --install /usr/bin/java java /home/jdk1.6.0_45/bin/java 300
  update-alternatives --install /usr/bin/javac javac /home/jdk1.6.0_45/bin/javac 300

6.update-alternatives --config java

.bashrc

JAVA_HOME=/home/jdk1.6.0_45
export JAVA_HOME
PATH=$JAVA_HOME/bin:$PATH
export PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export CLASSPATH
export JAVA_HOME=/home/jdk1.6.0_45
export PATH=$PATH:$JAVA_HOME/bin
export LD_LIBRARY_PATH=.:/home/jdk1.6.0_45/bin