The full pathname of a JDK installation for Oracle SQL Developer

Question

I want to run Oracle SQL Devloper on Ubuntu with this command:

sh sqldeveloper/sqldeveloper.sh

Then I got this message:

Answer 1

 apt-get install openjdk-6-jre
 apt-get install openjdk-7-jre
 apt-get install openjdk-6-jdk
 apt-get install openjdk-7-jdk
 add-apt-repository ppa:webupd8team/java
 apt-get update
 apt-get install oracle-java7-installer