linux下jdk的安装

1.检查是否已经安装了jdk

rpm -qa | grep jdk or rpm -a jdk or java -version

2.若已经安装了jdk，则可以选择卸载掉

rpm -e jdk的包名

3.正式安装jdk

1)jdk-6u45-linux-x64-rpm.bin

mkdir /usr/java

mv jdk-6u45-linux-x64-rpm.bin /usr/java

chmod +x jdk-6u45-linux-x64-rpm.bin

./jdk-6u45-linux-x64-rpm.bin(执行该文件后将会生成文件jdk-6u45-linux-amd64.rpm)

rpm -ivh jdk-6u45-linux-amd64.rpm

2)jdk-6u45-linux-x64.bin

mkdir /usr/java

mv jdk-6u45-linux-x64.bin

chmod +x jdk-6u45-linux-x64.bin

./jdk-6u45-linux-x64.bin

4.配置环境变量

#vim /etc/profile

export JAVA_HOME=/usr/java/jdk1.6.0_45

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

5.测试是否安装完成

1）java -version

2)#vim hello.java

public class hello{

              public static void main(String args[]){

                            System.out.println(“hello owrld”);

              }

}

#javac hello.java

#java hello

#若输出hello则表示已经安装成功