| 承同一层次的其它的内部类 ,甚至可以继承外部类本身。下面我们给出最后一个例子做为结束：
public class Layer {
//Layer类的成员变量
private String testStr = "testStr";
//Person类，基类
class Person{
String name;
Email email;
public void setName(String nameStr){
this.name = nameStr;
}
public String getName(){
return this.name;
}
public void setEmail(Email emailObj){
this.email = emailObj;
}
public String getEmail(){
return this.email.getMailStr();
}
//内部类的内部类，多层内部类
class Email{
String mailID;
String mailNetAddress;
Email(String mailId,String mailNetAddress){
this.mailID = mailId;
this.mailNetAddress = mailNetAddress;
}
String getMailStr(){
return this.mailID +"@"+this.mailNetAddress;
}
}
}
//另一个内部类继承外部类本身
class ChildLayer extends Layer{
void print(){
System.out.println(super.testStr);//访问父类的成员变量
}
}
//另个内部类继承内部类Person
class OfficePerson extends Person{
void show(){
System.out.println(name);
System.out.println(getEmail());
}
}
//外部类的测试方法
public void testFunction(){
//测试第一个内部类
ChildLayer childLayer = new ChildLayer();
childLayer.print();
//测试第二个内部类
OfficePerson officePerson = new OfficePerson();
officePerson.setName("abner chai");
//注意此处，必须用 对象.new 出来对象的子类对象
//而不是Person.new Email(...)
//也不是new Person.Email(...)
officePerson.setEmail
(officePerson.new Email("josserchai","yahoo.com"));
officePerson.show();
}
public static void main(String[] args) {
Layer layer = new Layer();
layer.testFunction();
}
}
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