How to create an executable jar file with 1 GB heap

Question

I created a class that gives a text file containing system performance as output. I want to run it as an executable Jar. but when I run the Jar I want to increa

Answer 1

 java -Xms1200m -Xmx1300m -jar FILENAME.jar

Define this somewhere in the jar File or in the Manifest is not possible:

Can I set Java max heap size for running from a jar file?