Java帮助: why can't I access the static methods declared in a class outside the current main method file

Question

遵循 SAX 的 JavaDocs 教程: 主方法无法识别方法usage()。据我所知，它应该是可访问的，因为这些方法被声明为静态，并且与主方法存在于同一包中。

public class Main {
    public static void main(String args[]){
        String filename = null;

//Checks to see if commnad line arguments are present
        for (int i = 0; i < args.length; i++) {
            filename = args[i];
            if (i != args.length - 1) {
                usage();
            }
        }

        if (filename == null) {
            usage();
        } 

//Defined in the same package as the main method
    public class SAXLocalNameCount extends DefaultHandler{
        private Hashtable tags;

        public void startDocument() throws SAXException{
            tags = new Hashtable();
        }

//The problem method    
    private static void usage() {
       System.err.println("Usage: SAXLocalNameCount <file.xml>");
       System.err.println("       -usage or -help = this message");
       System.exit(1);
    }
}

Answer 1

usage() 似乎是 SAXLocalNameCount 类的成员，而不是 Main 类的成员。尽管有缩进。