Process and Thread

Hi ,

What is the difference between process and thread in java.How to have different processess in a java code.



Thank you.

sannuth kashikar wrote: How to have different processess in a java code.

A process is, more or less, the same as a program or application.

"A Java code with different processes" could only mean multiple copies of the JVM -- i.e., launching java.exe multiple times.

What is the use of java.lang.Process class.How useful is this ?

sannuth kashikar wrote:What is the use of java.lang.Process class.How useful is this ?

It's part of Java's machinery for launching other programs. It's useful to the extent that you ... need to launch other programs!

You don't create Process objects yourself. If you launch a program with the Runtime.exec() methods, or the ProcessBuilder class, then you will get a Process object that you can use to keep track of the running program.

A Process object is good for only a few things:
- interaction with the process using the input, output and error streams
- terminating the process
- waiting for the process to finish before doing anything else
- retrieving the exit code of the process

That's why there are only methods for these operations.