How can I use staitc method?thanks!

Question

here is my code :
class a
void go()
System.out.println("now you are calling a.go method!");
public class b extends a
public static void main(String args[])
a t1=new a();
t1.go();
It can be compiled and excuted perfectly,but I read from book that "in static method ,we can olny call static variable or method....." ,but t1.go() method is not static method ,why? thanks!

Answer 1

static methods cannot refer to the methods and variables in their scope. They can however instantiate an object and use it... just like you did in your code.
Think about this.
public class SuperString extends String{
  public static void test(){
    String hello = "Hello";
    System.out.println(hello + " The string length is: " + hello.length());
}in this example whe have String class that we added a static function to. It is otherwise the same thing as a String. Notice how I can instantiate and use a String class, but If I tried something like this
public class SuperString extends String{
  public static void test(){
    System.out.println(this + " The string length is: " + this.length());
}it would fail.