java--内部类（局部）
package com.qianfeng.demo5;
public class Mother{
//sex= 1 男孩
//sex= 0 女孩
publicPerson birth(int sex){
if(sex == 1){
returnnew Boy("男");
}else{
returnnew Girl("女");
}
}
publicPerson birth2(int sex){
class Boy extends Person{
publicBoy(String sex) {
super(sex);
}
}
class Girl extends Person{
publicGirl(String sex) {
super(sex);
}
}
if(sex == 1){
returnnew Boy("男");
}else{
returnnew Girl("女");
}
}
publicPerson birth3(int sex){
if(sex == 1){
returnnew Person(){
int age = 0;
String sex = "男";
};
}else{
returnnew Girl("女");
}
}
}
package com.qianfeng.demo5;
public class Person {
publicString sex;
publicint age;
publicPerson(String sex){
this.sex = sex;
}
publicPerson(){
}
}
package com.qianfeng.demo5;
public class Girl extends Person {
publicGirl(String sex) {
super(sex);
// TODO Auto-generated constructor stub
}
}
package com.qianfeng.demo5;
public class Boy extends Person {
publicBoy(String sex) {
super(sex);
// TODO Auto-generated constructor stub
}
}
package com.qianfeng.demo4;
public class Outer {
publicint a = 1;
publicstatic int b = 2;
publicvoid method(){
final int abb = 22;
class Inner{
publicint a = 33;
//单单使用static修饰的变量不能再局部内部类中定义
//配合final使用则表示常量
//publicstatic int b = 22;
publicvoid method(){
System.out.println(a);
//Local variable abb defined in anenclosing
//scope must be final or effectivelyfinal
//a = abb;
//abb++;
System.out.println(abb);
}
//Themethod method2 cannot be declared static;
//staticmethods can only be declared in a static or top level type
/*publicstatic void method2(){
}*/
}
//abb++;
System.out.println(abb);
Inner inner = new Inner();
inner.method();
}
publicstatic void main(String[] args) {
Outer outer = new Outer();
outer.method();
}
}