Simple screenshot that explains the non-static invocation.

/*
Instance invocation in the memory:

*/
package kju.obj;

import static kju.print.Printer.*;
public class NonStaticInvoke {
public static void main(String[] args) {
Person p = new Person("lily");
p.setName("lucy");
}
}

class Person {
public static final String country = "cn";
private String name;
public Person(String name) {
this.name = name;
}

public static void showCountry() {
println("country = " + country);
}

public void setName(String name) {
this.name = name;
}
}