静态内部类无法访问外部类的实例成员

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestStaticInnerClass
{
	private int prop1 = 5;
	private static int prop2 = 9;
	static class StaticInnerClass
	{
		private static int age;
		public void accessOuterProp()
		{
			//下面代码出现错误：静态内部类无法访问外部类的实例成员
			System.out.println(prop1);
			//下面代码正常
			System.out.println(prop2);
		}
	}
}
/*
TestStaticInnerClass.java:22: 错误: 无法从静态上下文中引用非静态 变量 prop1
                        System.out.println(prop1);
                                           ^
1 个错误
请按任意键继续. . .
*/