Java非静态内部类和静态内部类，访问父类的非静态和静态成员变量及成员函数

public class Test {

	// Not static variable
	private int mAge = 10;
	
	// Static variable
	private static int mId = 1;
	
	// Single instance object
	private static Test test = null;
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println("--- main() start --->");

		test = getIntance();
		
		InnerClass ic;
		ic = test.new InnerClass();
		
		System.out.println("----------------");
		
		test.setAge(20);
		test.setId(2);
		
		InnerStaticClass isc;
		isc = new InnerStaticClass();

		System.out.println("--- main() end <---");

	}
	
	/**
	 * Get single instance object
	 */
	public static Test getIntance() {
		if (null == test) {
			test = new Test();
		}
		
		return test;
	}
		
	public int getAge() {
		return mAge;
	}

	public void setAge(int age) {
		mAge = age;
	}

	public static int getId() {
		return mId;
	}

	public static void setId(int id) {
		mId = id;
	}


	/**
	 * Not static inner class
	 */
	public class InnerClass {
		private int mInnerAge;
		private int mInnerId;
		
		public InnerClass()
		{
			System.out.println("InnerClass");
			mInnerAge = mAge; // OK
			mInnerAge = getAge(); // OK
			System.out.println("mInnerAge = " + mInnerAge);
			
			mInnerId = mId; // OK
			mInnerId = getId(); // OK
			System.out.println("mInnerId = " + mInnerId);
		}
	}
	
	/*
	 * Static inner class
	 */
	public static class InnerStaticClass {
		private int mInnerAge;
		private int mInnerId;
		
		public InnerStaticClass()
		{
			System.out.println("InnerStaticClass");
			
			// Cannot make a static reference to the non-static field mAge
//			mInnerAge = mAge;
			
			// Cannot make a static reference to the non-static method getAge() from the type Test
//			mInnerAge = getAge();
			System.out.println("mInnerAge = " + mInnerAge);
			
			mInnerId = mId; // OK
			
			mInnerId = getId(); // OK
			
			System.out.println("mInnerId = " + mInnerId);
		}
	}
}

输出：

--- main() start --->
InnerClass
mInnerAge = 10
mInnerId = 1
----------------
InnerStaticClass
mInnerAge = 0
mInnerId = 2
--- main() end <---