main方法也无权访问非静态成员。
public class Snippet{ private String instanceVariable; private static String staticVariable; public String instanceMethod() { return "instance"; } public static String staticMethod() { return "static"; } public static void main(String[] args) { System.out.println(staticVariable); // ok System.out.println(Snippet.staticMethod()); // ok System.out.println(new Snippet().instanceMethod()); // ok System.out.println(new Snippet().instanceVariable); // ok System.out.println(Snippet.instanceMethod()); // wrong System.out.println(instanceVariable); // wrong }}
