内部类的四种实现方式
内部类分为四种：
1.成员内部类
2.局部内部类
3.静态内部类
4.匿名内部类1.成员内部类
Java code
<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->//成员内部类......相当于非静态方法class MemberInner { private int a = 3; public class Inner2 { private int a = 2; public void doSomething() { // 调用外部类的属性 System.out.println(MemberInner.this.a);// 这块要注意......很重要！！！ System.out.println(a); } }}public class Test3 { public static void main(String[] args) { MemberInner.Inner2 inner2 = new MemberInner().new Inner2();// 非静态内部类要new实例 inner2.doSomething(); }}<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->//静态内部类......相当于静态方法class StaticInner{ private static int a=3; public static class Inner{ public void test(){ System.out.println(a); } }}public class Test2 { public static void main(String[] args) { StaticInner.Inner inner=new StaticInner.Inner();//静态内部类直接调用 inner.test(); }}<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->//局部内部类......相当于局部变量class LocalInner { public void doSomething(int b) { final int a = 3;// 只能访问final的变量 class Inner3 { public void test(int b) { System.out.println(b); System.out.println(a); } } new Inner3().test(b); }}public class Test4 { public static void main(String[] args) { LocalInner inner = new LocalInner(); inner.doSomething(4); }}