declaration

I hope this can help you:

public class Methods {

    private int c; // instance variable, visible in non-static methods of the Methods-class
    private static int f;// class variable, visible in all methods of the Methods-class

    public static void main(String[] args) {
        int a; // locale variable, visible only in main-method
        f = 2;
    }

    public void test1(){
        int b;// locale variable, visible only in test1-method
        c = 12;
        f = 12;
    }

    public void test2(){
        int d;// locale variable, visible only in test2-method
        c = 15;
    }
}

Description for class and instance variable https://www.tutorialspoint.com/What-are-class-variables-instance-variables-and-local-variables-in-Java