Com.Java.Basis第十一课 《抽象+多态》（二）

package com.JavaBasicsDemo6.Abstract8;
public class Animal {
    public int age = 40;
    public String name;
    public Animal() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Animal(String name) {
        super();
        this.name = name;
    }
    public void eat(){
        System.out.println("动物吃东西");
    }
}
package com.JavaBasicsDemo6.Abstract8;
public class Cat extends Animal{
    public int age = 15;
    public int weight = 10;
    public Cat() {
    }
    public Cat(String name) {
        super(name);
    }
    @Override
    public void eat(){
        // TODO Auto-generated method stub
        System.out.println("猫抓老鼠");
    }
    public void playGame(){
        System.out.println("猫捉迷藏");
    }
}
package com.JavaBasicsDemo6.Abstract8;
public class Dog extends Animal{
    public void guard(){
    }
}
package com.JavaBasicsDemo6.Abstract8;
public class AnimalTest {
    public static void main(String[] args) {
        // 创建一个Animal对象
        Animal a = new Animal();
        //创建一只猫
        Cat c = new Cat("猫");
        thinking(c);
        //父类型的引用接收了（指向）子类型的对象，称为向上造型
        Animal a1 = new Dog();
        System.out.println(a1.age);
        a1.eat();
//    Cat c1 = (Cat)new Animal();
    }
    public static void thinking(Animal animal) {//各种动物在思考Animal animal = new Cat();
        if (animal.name == "猫") {
            System.out.println("猫在思考");
        }
        if (animal.name == "狗狗") {
            System.out.println("狗在思考");
        }
    }
}

package abstact;
/**
 * 抽象类不能被实例化(初学者很容易犯的错)，如果被实例化，就会报错，编译无法通过。只有抽象类的非抽象子类可以创建对象。
抽象类中不一定包含抽象方法，但是有抽象方法的类必定是抽象类。
抽象类中的抽象方法只是声明，不包含方法体，就是不给出方法的具体实现也就是方法的具体功能。
构造方法，类方法（用 static 修饰的方法）不能声明为抽象方法。
抽象类的子类必须给出抽象类中的抽象方法的具体实现，除非该子类也是抽象类。
 * @author MZFAITHDREAM
 * @author MZFAITHDREAM
 *
 */
public abstract class Student {
  //姓名
    private String name;
    //年龄
    private int age;
    //班级
    private String grand;
    public Student(){}
    public Student(String name,int age,String grand){
      this.name = name;
      this.age = age;
      this.grand = grand;
    }
    //getXxx()/setXxx()
    public String getName(){
      return name;
    }
    public void setName(String name){
      this.name = name;
    }
    public int getAge(){
      return age;
    }
    public void setAge(int age){
      this.age = age;
    }
    public String getGrand(){
      return grand;
    }
    public void setGrand(String grand){
      this.grand = grand;
    }
    //学习study(抽象方法) (抽象方法)
    public abstract void study();
    //学习打王者游戏(抽象方法 playingking)
    public abstract void playingking();
    //学习english (抽象方法)
    public abstract void learnenglish();
    //吃饭eat(具体方法)
    public void eat(){
      System.out.println("学习累了,去吃饭");
    }
    @Override
    public int hashCode() {
      final int prime = 31;
      int result = 1;
      result = prime * result + age;
      result = prime * result + ((grand == null) ? 0 : grand.hashCode());
      result = prime * result + ((name == null) ? 0 : name.hashCode());
      return result;
    }
    @Override
    public boolean equals(Object obj) {
      if (this == obj)
        return true;
      if (obj == null)
        return false;
      if (getClass() != obj.getClass())
        return false;
      Student other = (Student) obj;
      if (age != other.age)
        return false;
      if (grand == null) {
        if (other.grand != null)
          return false;
      } else if (!grand.equals(other.grand))
        return false;
      if (name == null) {
        if (other.name != null)
          return false;
      } else if (!name.equals(other.name))
        return false;
      return true;
    }
    @Override
    public String toString() {
      return "Student [name=" + name + ", age=" + age + ", grand=" + grand + "]";
    }
  }
package abstact;
//定义具体基础班学员类
public class BasicStudent  extends Student{
  public BasicStudent(){
    super();
  }
  public void study(){
    System.out.println("基础班学员学习的是JavaSE");
  }
  public void playingking() {
    System.out.println("学会一点游戏，不是很好");
  }
  public void learnenglish() {
    System.out.println("英语学的是皮毛");
  }
  }
package abstact;
public class OutstandingStudent  extends Student{
  public OutstandingStudent() {}
  public OutstandingStudent(String name, int age, String grand) {
    super(name, age, grand);
  }
  @Override
  public void study() {
    System.out.println("好好学习，天天向上");
  }
  @Override
  public void playingking() {
    System.out.println("王者是什么呢");
  }
  @Override
  public void learnenglish() {
    System.out.println("english很厉害");
  }
}
package abstact;
//定义具体就业班学员类
public class WorkStudent extends Student{
  public WorkStudent(){}
  public WorkStudent(String name,int age,String grand){
    super(name,age,grand);
  }
  public void study(){
    System.out.println("就业班学员学习的是JavaEE");
  }
  @Override
  public void playingking() {
    System.out.println("游戏上王者，学业一事无成");
  }
  @Override
  public void learnenglish() {
    System.out.println("I don't like english");
  }
}
package abstact;
public class StudentTest {
/**
 * abstact 父类中定义，子类中去实现，Test 中去测试
 * @param args
 */
  public static void main(String[] args) {
      //基础班学员测试
      //多态(测试)
      //方式1
    Student s1 = new BasicStudent();
      s1.setName("一日王月");
      s1.setGrand("bdqn_S1");
      System.out.println(s1.getName()+"---"+s1.getAge()+"---"+s1.getGrand());
      s1.study();
      s1.eat();
      s1.learnenglish();
      s1.playingking();
      System.out.println("---------------------------------");
      //方式2
      s1 = new BasicStudent();
      System.out.println(s1.getName()+"---"+s1.getAge()+"---"+s1.getGrand());
      s1.study();
      s1.eat();
      s1.learnenglish();
      s1.playingking();
      System.out.println("---------------------------------");
      //就业班学员测试
      //方式1
      Student   s = new WorkStudent();
      s.setName("我的人生");
      s.setAge(25);
      s.setGrand("bdqn_Y2");
      System.out.println(s.getName()+"---"+s.getAge()+"---"+s.getGrand());
      s.study();
      s.eat();
      s.learnenglish();
      s.playingking();
      System.out.println("---------------------------------");
      //方式2
      s = new BasicStudent();
      System.out.println(s.getName()+"---"+s.getAge()+"---"+s.getGrand());
      s.study();
      s.eat();
      System.out.println(s.hashCode());
      System.out.println("---------------------------------");  
      //优秀学员
      //方式1
      Student a  =new  OutstandingStudent();
      a.setName("自学成才");
      a.setAge(20);
      a.setGrand("bdqn_S1——阿0298");
      System.out.println(a.getName()+"---"+a.getAge()+"---"+a.getGrand());
      a.study();
      a.eat();
      a.learnenglish();
      a.playingking();
      System.out.println(a.hashCode());
      System.out.println("---------------------------------");
      //方式2
      a = new BasicStudent();
      System.out.println(a.getName()+"---"+a.getAge()+"---"+a.getGrand());
      a.study();
      a.eat();
      a.learnenglish();
      a.playingking();
      System.out.println(s.hashCode());
      System.out.println("---------------------------------");
  }
}