Why non-static context can't be accessible from static context in java?

Question

Whenever we try to access the non-static content from a static block then we get compile error. What is the reason behind this?

Answer 1

Static fields and methods are connected to the class itself and not its instances. If you have a class A, a 'normal' method b and a static method c and make an instance a of your class, the calls to A.c()and a.b() are valid. Method c() has so no idea, which instance is connected, so it cannot use non-static fields.

The solution for you is, that you make your fields static or make your methods non-static. You main could look like this then:

class Programm {
public static void main(String[] args){
Programm programm = new Programm(); programm.start();
}
public void start(){
// can now access non-static fields } }
Source: StackOverflow