Java面向对象编程（封装/继承/多态）实例解析

package com.hz.test;public class Teacher {  private String name;  private String majorDirection;  private String teachCourse;  private int teachAge;  public Teacher() {    super();  }  public Teacher(String name,String majorDirection,String teachCourse,int teachAge) {    this.name = name;    this.majorDirection = majorDirection;    this.teachCourse = teachCourse;    this.teachAge = teachAge;  }  public String getName() {    return name;  }  public void setName(String name) {    this.name = name;  }  public String getMajorDirection() {    return majorDirection;  }  public void setMajorDirection(String majorDirection) {    this.majorDirection = majorDirection;  }  public String getTeachCourse() {    return teachCourse;  }  public void setTeachCourse(String teachCourse) {    this.teachCourse = teachCourse;  }  public int getTeachAge() {    return teachAge;  }  public void setTeachAge(int teachAge) {    this.teachAge = teachAge;  }  public String toString() {    return "姓名=" + getName() + ", 专业方向=" + getMajorDirection()        + ", 所教课程=" + getTeachCourse() + ", 教龄=" + getTeachAge();  }}

package com.hz.test;import java.util.Arrays;/** * @author ztw * */public class Student {  private String name;  private int age;  private String[] courses;  private String interest;  public Student() {    super();  }  public Student(String name,int age,String[] courses,String interest) {    this.name = name;    this.age = age;    this.courses = courses;    this.interest = interest;  }  public void setName(String name){    this.name = name;  }  public String getName(){    return name;  }  public void setAge(int age){    if(age<0){      System.out.println("年龄不能为负值");    }else{      this.age = age;    }  }  public int getAge(){    return age;  }  public void setCourses(String[] courses){    this.courses = courses;  }  public String getCourses(){    return Arrays.toString(courses);  }  public void setInterest(String interest){    this.interest = interest;  }  public String getInterest(){    return interest;  }  public String toString() {    return "姓名=" + getName() + ", 年龄=" + getAge() + ", 课程=" + getCourses()        + ", 兴趣=" + getInterest();  }  }

package com.hz.test;public class Test {  public static void main(String[] args) {    String arr[] = {"阿斯达","是的","大概","太诱惑"};    Student stu = new Student("张三",21,arr,"打球");    Teacher tea = new Teacher("王五","阿斯达","阿斯达",99);    System.out.println(stu);    System.out.println(tea);  }}

public class Play {  String main;  public Play(String main) {    this.main = main;  }  public void hitMonster() {    System.out.println(main+"打怪");  }}

/** * TaoistPriest:道士 * @author ztw * */public class TaoistPriest extends Play {  {    System.out.print("我是道士：");  }  public TaoistPriest(String main) {    super(main);  }}

/** * Master:法师 * @author ztw * */public class Master extends Play{  {    System.out.print("我是法师：");  }  public Master(String main) {    super(main);  }}

/** * Warrior:武士 * @author ztw * */public class Warrior extends Play{  {    System.out.print("我是武士：");  }  public Warrior(String main) {    super(main);  }}

public class Test {  public static void main(String[] args) {    TaoistPriest tp = new TaoistPriest("灵魂火符");    tp.hitMonster();    Master m = new Master("雷电术");    m.hitMonster();    Warrior w = new Warrior("烈火术");    w.hitMonster();  }}

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

public interface LoginListener {  public void succeed(String msg);  public void failed(String msg);}

public class MyLoginListener implements LoginListener{  public void succeed(String msg) {    System.out.println(msg);  }  public void failed(String msg) {    System.out.println(msg);  }}

public class Server {  public void login(String userName,String password,LoginListener listener) {    System.out.print("loading");    for (int i = 0; i < 10; i++) {      try {        Thread.sleep(100*i);        System.out.print(".");      } catch (InterruptedException e) {        // TODO Auto-generated catch block        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");      }    }  }}

public class LoginTest {  public static void main(String[] args) {    Scanner sc = new Scanner(System.in);    System.out.println("请输入用户名：");    String userName = sc.next();    System.out.println("请输入用户密码：");    String password = sc.next();    Server server = new Server();    server.login(userName, password, new MyLoginListener());  }}

请输入用户名： zhangsan 请输入用户密码： 123 loading……….登录成功