第6节 类的封装和继承

package com.fengzhuang;
/*
 *
 * @author yutianbao
 * @param
 * @date 2019/3/13 22:04
 * @return
 * @Motto: good good study,day day up
 */
public class FengZhuang {
    /*封装：将类的某些信息隐藏在类内部，不允许外部程序直接访问，而是通过
    该类提供的方法来实现对隐藏信息的访问。*/
    // 实现封装分三步
    //1.修改属性的可见性：将属性私有化
    private String name;
    private int age;
    private String phoneNo;

    //2.创建setter/getter方法
    //给name赋值
    public String getName() {
        return this.name;
    }
    //取name值
    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return this.age;
    }
    //3.添加对属性操制作的限制
    public void setAge(int age) {
        if(age>0&&age<=150){
            this.age = age;
        }else{
            System.out.println("您输入的年龄错误！");
            this.age = 25;
        }
    }
    public String getPhoneNo() {
        return this.phoneNo;
    }
    public void setPhoneNo(String phoneNo) {
        if(phoneNo.length()==11){
            this.phoneNo = phoneNo;
        }else{
            System.out.println("您输入的手机号错误！");
            this.phoneNo = "1xx xxxx xxxx" ;
        }
    }
    public void print(){
        System.out.println("我的名字是;"+this.getName()+",年龄是："+this.getAge()+",手机号是："+this.getPhoneNo());
    }

}

package com.fengzhuang;
/*
 *
 * @author yutianbao
 * @param
 * @date 2019/3/13 22:08
 * @return
 * @Motto: good good study,day day up
 */
public class Test {
    public static void main(String[] args){
        //FengZhuang fez = new FengZhuang("蒋辉煌",25,"18975742300");
        FengZhuang fez = new FengZhuang();
        fez.setName("余与");
        fez.setAge(160);
        fez.setPhoneNo("13632908564");
        fez.print();
    }

}　

package com.extend;
/**
 * 宠物类，狗狗和企鹅的父类
 */
public class Pet {
	private String name = "无名氏";// 昵称
	private int health = 100;// 健康值
	private int love = 20;// 亲密度

	/**
	 * 无参构造方法
	 */
	public Pet() {
		System.out.println("父类无参构造方法");
	}
	/**
	 * 有参构造方法
	 * @param name  昵称
	 */
	public Pet(String name,int health,int love) {
		this.name = name;
		this.health = health;
		this.love = love;
		System.out.println("父类有参构造方法");
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getHealth() {
		return health;
	}

	public void setHealth(int health) {
		if(health<0||health>100){
			System.out.println("健康值应该在0至100之间，默认值为60。");
			this.health=60;
			return;
		}
		this.health = health;
	}

	public int getLove() {
		return love;
	}



	public void setLove(int love) {
		if(love<0||love>100){
			System.out.println("亲密度应该在0至100之间，默认值为10。");
			this.love=10;
			return;
		}
		this.love = love;
	}

	/**
	 * 输出宠物信息
	 */
	public void print() {
		System.out.println("宠物的自白：\n我的名字叫" +
				this.name + "，我的健康值是" + this.health
				+ "，我和主人的亲密程度是" + this.love + "。");
	}

	//重写Object类的equals()方法
	public boolean equals(Object obj){
		boolean flag = false;
		if(obj==this){  //==比较引用地址
			flag = true;
		}
		if(!(obj instanceof Pet)){  //instanceof  判断类型
			flag = false;
		}else{
			Pet pe = (Pet)obj;
			if(pe.love==this.love&&pe.health==this.health&&pe.love==this.love){
				flag = true;
			}
		}
		return flag;
	}
}

package com.extend;
/**
 * 狗狗类，宠物的子类
 */
public class Dog extends Pet {
	private String strain="哈士奇";// 品种

	//无参构造方法
	public Dog(String name,int health,int love,String strain) {
		super(name,health,love);
		this.strain = strain;
		System.out.println("dog类构造方法");
	}

	public String getStrain() {
		return strain;
	}

	public void setStrain(String strain) {
		this.strain = strain;
	}
	//重写父类方法
	public void print() {
		System.out.println("宠物的自白：\n我的名字叫" +
				this.getName() + "，我的品种是" + this.getStrain()+"，我的健康值是" + this.getHealth()
				+ "，我和主人的亲密程度是" + this.getLove() + "。");
	}
}

package com.extend;

import com.sun.jmx.snmp.SnmpString;

/**
 * 企鹅类
 */
public class Penguin extends Pet {
	private String sex="Q仔";// 企鹅性别

	//构造方法
	public Penguin(String name,int health,int love,String sex) {
		super(name,health,love);
		this.sex = sex;
		System.out.println("penguin类构造方法");
	}

	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	//重写父类方法
	public void print() {
		System.out.println("宠物的自白：\n我的名字叫" +
				this.getName() + "，我的性别是" + this.getSex()+"，我的健康值是" + this.getHealth()
				+ "，我和主人的亲密程度是" + this.getLove() + "。");
	}


}

package com.extend;
//测试类
public class Test {
	public static void main(String[] args) {
		// 1、创建宠物对象pet并输出信息
		Pet pet = new Pet("贝贝",99,60);
		//Pet pet1 = new Pet("贝贝",99,60);
		//Pet pet2 = new Pet("贝贝",99,59);
		//System.out.println("equals()比较对象："+pet1.equals(pet2));
		pet.print();
		// 2、创建狗狗对象dog并输出信息
		Dog dog = new Dog("贝贝",59,40,"牧羊犬");
//		dog.setName("多多");
//		dog.setHealth(90);
//		dog.setLove(80);
//		dog.setStrain("吉娃娃");
		dog.print();
		// 3、创建企鹅对象pgn并输出信息
		Penguin pgn = new Penguin("幽幽",85,20,"Q妹");
//		pgn.setName("大黑");
//		pgn.setHealth(98);
//		pgn.setLove(99);
//		pgn.setSex("Q妹");
		pgn.print();

		/**************************/
//		Bus bus = new Bus(20);
//		bus.print();
		//System.out.println(pgn.equals(dog));
	}
}

package com.extend;
//测试类
class Car{
	private int siteNo = 4;//载客量
	public Car(){
		System.out.println("载客量是："+siteNo+"人");
	}
	public void setSiteNo(int siteNo){
		this.siteNo = siteNo;
	}
	public void print(){
		System.out.println("载客量是："+siteNo+"人");
	}
}
class Bus extends Car{
	 public Bus(int siteNo){
		 setSiteNo(siteNo);
	 }
}
public class Test {
	public static void main(String[] args) {
            Bus bus = new Bus(20);
            bus.print();     
      }
}