jdk 설치 어떻게

[root@SearchServer /]# java -version
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
Classic VM (build 1.4.2, J2RE 1.4.2 IBM build cxia32142-20041210 (JIT enabled: jitc))

제가 rpm -e java-1.4.2-ibm-jdbc-1.4.2.1-1jpp_2rh로삭제를 했는데
java -version하면 나오거든요
jdk 1.5를 깔려고 하는데 깔아도 될까요?

한번 깔아보아습니다.
마직막 부분
Next Steps:

    1. Access the About Application Server PE 9 welcome page at:
       file:///opt/SDK/docs/about.html

    2. Start the Application Server by executing:
       /opt/SDK/bin/asadmin start-domain domain1

    3. Start the Admin Console:
       http://localhost:4848

/opt/SDK/디렉토리에 잘 깔린것 같습니다.

그리고
vi /etc/profile
PATH="$PATH:/opt/SDK/bin"
export JAVA_HOME="/opt/SDK"

source profile
했는데

java -version하면 =>
[root@SearchServer bin]# java -version
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2)
Classic VM (build 1.4.2, J2RE 1.4.2 IBM build cxia32142-20041210 (JIT enabled: jitc))
[root@SearchServer bin]#

아직도 이렇게 나타납니다.