what is difference between declaring variable out of main method and inside main method?

Question

When I was reading book about Java , I saw one example written like this. And I am wondering can I declare variable in outside of main method ? What is difference between declar

Answer 1

Declaring a variable in the main method will make it available only in the main. Declaring a variable outside will make it available to all the methods of the class, including the main method.

Example :

public class Foo {
   private String varOne = "Test";

   public void testOne() {
     System.out.println(varOne);
     System.out.println(varTwo); // Error, this variable is available in the testTwo method only
   }

   public void testTwo() {
     String varTwo = "Bar";
     System.out.println(varOne); // Will display "Test"
     System.out.println(varTwo); // Will display "Bar"
   }
}