Possible Duplicate:
Why do I get “non-static variable this cannot be referenced from a static context”?
Here are the codes
public class Stack
{
private class Node{
...
}
...
public static void main(String[] args){
Node node = new Node(); // generates a compiling error
}
}
the error says:
non-static class Node cannot be referenced from a static context
Why shouldn't I refer the Node class in my main() method ?
A non-static nested class in Java contains an implicit reference to an instance of the parent class. Thus to instantiate a Node, you would need to also have an instance of Stack. In a static context (the main method), there is no instance of Stack to refer to. Thus the compiler indicates it can not construct a Node.
If you make Node a static class (or regular outer class), then it will not need a reference to Stack and can be instantiated directly in the static main method.
See the Java Language Specification, Chapter 8 for details, such as Example 8.1.3-2.
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