Question

In java, what does it mean when a variable "exists" from its declaration to }?

Answer 1

It means that you can use that variable in that block only.. You can not use that variable outside that block

Please find the below example

class Test{
        public void fun(){
                int x=10;
                // you can use x from here to 
                System.out.prinln();
                System.out.prinln();
                System.out.prinln();
                System.out.prinln();
                System.out.prinln();
                System.out.prinln();
                // here only
        }
        public void sun(){
                // you can't use the x here 
        }
}