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/*program HelloWorld.java*/

class HelloWorld

public void display()
system.out.println("Hi ! BlueJ is very easy to work with.");


can someone tell me what does this error means?
"package system does not exist"



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A package does not exist with the name "system".  There is a package with the name "System".    lower case/higher case.

Further, normally we define a function called  main in the main entry object class.

     public static void main (String  args [] )  {


I dont see that in your program .  I hope that is present in your class definition on your computer.

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