Java非靜態內部類和靜態內部類，訪問父類的非靜態和靜態成員變數及成員函數

 public class Test {</p><p>// Not static variable<br />private int mAge = 10;</p><p>// Static variable<br />private static int mId = 1;</p><p>// Single instance object<br />private static Test test = null;</p><p>/**<br /> * @param args<br /> */<br />public static void main(String[] args) {<br />// TODO Auto-generated method stub<br />System.out.println("--- main() start --->");</p><p>test = getIntance();</p><p>InnerClass ic;<br />ic = test.new InnerClass();</p><p>System.out.println("----------------");</p><p>test.setAge(20);<br />test.setId(2);</p><p>InnerStaticClass isc;<br />isc = new InnerStaticClass();</p><p>System.out.println("--- main() end <---");</p><p>}</p><p>/**<br /> * Get single instance object<br /> */<br />public static Test getIntance() {<br />if (null == test) {<br />test = new Test();<br />}</p><p>return test;<br />}</p><p>public int getAge() {<br />return mAge;<br />}</p><p>public void setAge(int age) {<br />mAge = age;<br />}</p><p>public static int getId() {<br />return mId;<br />}</p><p>public static void setId(int id) {<br />mId = id;<br />}</p><p>/**<br /> * Not static inner class<br /> */<br />public class InnerClass {<br />private int mInnerAge;<br />private int mInnerId;</p><p>public InnerClass()<br />{<br />System.out.println("InnerClass");<br />mInnerAge = mAge; // OK<br />mInnerAge = getAge(); // OK<br />System.out.println("mInnerAge = " + mInnerAge);</p><p>mInnerId = mId; // OK<br />mInnerId = getId(); // OK<br />System.out.println("mInnerId = " + mInnerId);<br />}<br />}</p><p>/*<br /> * Static inner class<br /> */<br />public static class InnerStaticClass {<br />private int mInnerAge;<br />private int mInnerId;</p><p>public InnerStaticClass()<br />{<br />System.out.println("InnerStaticClass");</p><p>// Cannot make a static reference to the non-static field mAge<br />//mInnerAge = mAge;</p><p>// Cannot make a static reference to the non-static method getAge() from the type Test<br />//mInnerAge = getAge();<br />System.out.println("mInnerAge = " + mInnerAge);</p><p>mInnerId = mId; // OK</p><p>mInnerId = getId(); // OK</p><p>System.out.println("mInnerId = " + mInnerId);<br />}<br />}<br />}

輸出：

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