一个内部类定义在外部类方法中的的例子（调用参数的时候需要注意final来修饰）...

class Outer { private String name = "hello world . "; public void fun(final String s) { class Inner { public void print() { System.out.println("name:" + name+ s); } } new Inner().print(); } } public class InnerDemo01 { public static void main(String args[]) { new Outer().fun("nice to meet you"); } }