定义一个father和child类，并进行测试

class Father{
private String name = "zhangjun";
class Child{
public void introFather(){
System.out.println(name);
}
}
}

public class Test {
public static void main(String[] args) {
Father.Child c = new Father().new Child();
c.introFather();
}
}

定义一个father和child类，并进行测试？然后呢