Local variable age defined in an enclosing scope must be final or effectively final

标题：Local variable age defined in an enclosing scope must be final or effectively final

原因是：被匿名内部类访问的局部变量，相当于被final修饰了，故只能赋一次值；

如下代码，注释了 age=6;故编译器不会报错，若不注释age=6;则报Local variable age defined in an enclosing scope must be final or effectively final

interface A{
     
	void test();
}
public class DemoInner03{
     
	public static void main(String[] args) {
     
		int age=8;
//		age=6;

		A a=new A() {
     
			public void test() {
     
				System.out.println("哈哈哈，真轻松！！！");
				System.out.println(age);
			}
		};
		a.test();
	}
}