1. Lecture 4
More concepts in OOP
Object Oriented Programming
Eastern University, Dhaka
Md. Raihan Kibria

2. Classpath
 Classpath is a reference which needs to be
provided to JRE/JVM to run classes
 The reference indicates the location where
the classes are to be found
 Classpath is to be given as a switch to
“java” command

3. Example
java -cp c:temp B
 This means the class B is to be found
under c:temp folder
 The above command can be issued from
any folder
 Suppose B is under com package and com
folder is under c:temp
 To run B, issue command:
 java -cp c:temp com.B

4. Example
 B.java was under c:tempcom folder.
 The package declaration for B.java was
like: package com;

5. Installing and using JDK
www.oracle.com/technetwork/java/javase/dow
nloads/index.html
Install by clicking the exe.
 Check if java command works in command
line:
java -version

6. Installing and using JDK
Common issues:
 java command not found: check that
jdk/bin is referenced to under path

7. Tools that make you productive
 IDE: Integrated development envionment
 Example:
– Eclipse, Netbeans, IntelliJ

8. Strengths and Advantages
 Summarize the special features and
advantages of the product being introduced