Java面向对象编程（封装/继承/多态）实例解析
本文主要介绍了面向对象的三大特征实例解析，下面看看具体内容。
封装
封装一个Teacher和Student类
packagecom.hz.test;
publicclassTeacher{
privateStringname;
privateStringmajorDirection;
privateStringteachCourse;
privateintteachAge;
publicTeacher(){
super();
}
publicTeacher(Stringname,StringmajorDirection,StringteachCourse,intteachAge){
this.name=name;
this.majorDirection=majorDirection;
this.teachCourse=teachCourse;
this.teachAge=teachAge;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicStringgetMajorDirection(){
returnmajorDirection;
}
publicvoidsetMajorDirection(StringmajorDirection){
this.majorDirection=majorDirection;
}
publicStringgetTeachCourse(){
returnteachCourse;
}
publicvoidsetTeachCourse(StringteachCourse){
this.teachCourse=teachCourse;
}
publicintgetTeachAge(){
returnteachAge;
}
publicvoidsetTeachAge(intteachAge){
this.teachAge=teachAge;
}
publicStringtoString(){
return"姓名="+getName()+",专业方向="+getMajorDirection()
+",所教课程="+getTeachCourse()+",教龄="+getTeachAge();
}
}
Student类
packagecom.hz.test;
importjava.util.Arrays;
/**
*@authorztw
*
*/
publicclassStudent{
privateStringname;
privateintage;
privateString[]courses;
privateStringinterest;
publicStudent(){
super();
}
publicStudent(Stringname,intage,String[]courses,Stringinterest){
this.name=name;
this.age=age;
this.courses=courses;
this.interest=interest;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicStringgetName(){
returnname;
}
publicvoidsetAge(intage){
if(age<0){
System.out.println("年龄不能为负值");
}else{
this.age=age;
}
}
publicintgetAge(){
returnage;
}
publicvoidsetCourses(String[]courses){
this.courses=courses;
}
publicStringgetCourses(){
returnArrays.toString(courses);
}
publicvoidsetInterest(Stringinterest){
this.interest=interest;
}
publicStringgetInterest(){
returninterest;
}
publicStringtoString(){
return"姓名="+getName()+",年龄="+getAge()+",课程="+getCourses()
+",兴趣="+getInterest();
}
}
测试类
packagecom.hz.test;
publicclassTest{
publicstaticvoidmain(String[]args){
Stringarr[]={"阿斯达","是的","大概","太诱惑"};
Studentstu=newStudent("张三",21,arr,"打球");
Teachertea=newTeacher("王五","阿斯达","阿斯达",99);
System.out.println(stu);
System.out.println(tea);
}
}
输出结果：
姓名=张三,年龄=21,课程=[阿斯达,是的,大概,太诱惑],兴趣=打球
姓名=王五,专业方向=阿斯达,所教课程=阿斯达,教龄=99
继承
定义Play，TaoistPriest，Master，Warrior
publicclassPlay{
Stringmain;
publicPlay(Stringmain){
this.main=main;
}
publicvoidhitMonster(){
System.out.println(main+"打怪");
}
}
/**
*TaoistPriest:道士
*@authorztw
*
*/
publicclassTaoistPriestextendsPlay{
{
System.out.print("我是道士：");
}
publicTaoistPriest(Stringmain){
super(main);
}
}
/**
*Master:法师
*@authorztw
*
*/
publicclassMasterextendsPlay{
{
System.out.print("我是法师：");
}
publicMaster(Stringmain){
super(main);
}
}
/**
*Warrior:武士
*@authorztw
*
*/
publicclassWarriorextendsPlay{
{
System.out.print("我是武士：");
}
publicWarrior(Stringmain){
super(main);
}
}
测试类
publicclassTest{
publicstaticvoidmain(String[]args){
TaoistPriesttp=newTaoistPriest("灵魂火符");
tp.hitMonster();
Masterm=newMaster("雷电术");
m.hitMonster();
Warriorw=newWarrior("烈火术");
w.hitMonster();
}
}
输出结果：
我是道士：灵魂火符打怪 我是法师：雷电术打怪 我是武士：烈火术打怪
多态
服务器，客户端交互
LoginListener
publicinterfaceLoginListener{
publicvoidsucceed(Stringmsg);
publicvoidfailed(Stringmsg);
}
MyLoginListener
publicclassMyLoginListenerimplementsLoginListener{
publicvoidsucceed(Stringmsg){
System.out.println(msg);
}
publicvoidfailed(Stringmsg){
System.out.println(msg);
}
}
Server
publicclassServer{
publicvoidlogin(StringuserName,Stringpassword,LoginListenerlistener){
System.out.print("loading");
for(inti=0;i<10;i++){
try{
Thread.sleep(100*i);
System.out.print(".");
}catch(InterruptedExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
if(userName.equals("zhangsan")&&password.equals("123")){
if(listener!=null){
listener.succeed("登录成功");
}
}else{
if(listener!=null){
listener.succeed("登录失败");
}
}
}
}
测试类
publicclassLoginTest{
publicstaticvoidmain(String[]args){
Scannersc=newScanner(System.in);
System.out.println("请输入用户名：");
StringuserName=sc.next();
System.out.println("请输入用户密码：");
Stringpassword=sc.next();
Serverserver=newServer();
server.login(userName,password,newMyLoginListener());
}
}
输出结果
请输入用户名： zhangsan 请输入用户密码： 123 loading……….登录成功
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