Variable Scope

Example

public class Main {
    static int visits = 0;              // class level: visible in all methods

    static void visit() {
        visits++;
        int local = 5;                  // only inside visit()
        System.out.println("visit " + visits + ", local " + local);
    }

    public static void main(String[] args) {
        visit();
        visit();
        int x = 10;                     // method scope
        if (x > 5) {
            int y = 20;                 // block scope: only inside this if
            System.out.println(x + y);
        }
        // System.out.println(y);       // error: cannot find symbol y
        for (int i = 0; i < 2; i++) {
            System.out.println("loop i = " + i);
        }
        // i is not visible here either
        System.out.println("total visits " + visits);
    }
}

Output

visit 1, local 5
visit 2, local 5
30
loop i = 0
loop i = 1
total visits 2