Java Complied File

sir
can we use our java complied file(.class) in a computer where java is not installed if yes then please guide me?
2nd:
what is toString() function, and why we use () when create an instance of class like Movie m=new Movie();
Thanks
Regards

diya [You must be registered and logged in to see this image.]

1) A JVM must be installed on the host machine to run the class file.

2) “toString()” is used to display state of an object in string format, it is often used when we want to see the current values/state of data members of object

3) Movie m=new Movie(); it is so that we are calling the constructor of Movie class. When ever a new object is to be created constructor of the class is called.