解析Java实现设计模式六大原则之里氏替换原则

public class Cache {
    public void set(String key, String value) {

    }
}

public class Redis extends Cache {
    @Override
    public void set(String key, String value) {

    }
}


public class Memcache extends Cache {
    @Override
    public void set(String key, String value) {

    }
}

public class CacheTest {
    public static void main(String[] args) {
        // 父类对象都可以接收子类对象
        Cache cache = new Cache();
        cache.set("key123", "key123");

        cache = new Redis();
        cache.set("key123", "key123");

        cache = new Memcache();
        cache.set("key123", "key123");
    }
}

public class Redis extends Cache{
    @Override
    public void set(String key, String value) {
        if (key == null || key.length() < 10 || key.length() > 100) {
            System.out.println("key的长度不符合要求");
            throw new IllegalArgumentException(key的长度不符合要求);
        }
    }
}

public class CacheTest {
    public static void main(String[] args) {
        // 父类对象都可以接收子类对象
        Cache cache = new Cache();
        cache.set("key123", "key123");

        cache = new Redis();
        cache.set("key123", "key123");
    }
}

public class Product {
    private BigDecimal amount;
    private Calendar createTime;
 
    public BigDecimal getAmount() {
        return amount;
    }
    public void setAmount(BigDecimal amount) {
        this.amount = amount;
    }
 
    public Calendar getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Calendar createTime) {
        this.createTime = createTime;
    }
}
 
public class ProductSort extends Sort<Product> {
 
    public void sortByAmount(List<Product> list) {
        //根据时间进行排序
        list.sort((h1, h2)->h1.getCreateTime().compareTo(h2.getCreateTime()));
    }
}

// 定义抽象类枪
public abstract class AbstractGun{
    // 射击
    public abstract void shoot();
    
    // 杀人
    public abstract void kill();
}

// 定义手枪，步枪，机枪
public class Handgun extends AbstractGun{   
    public void shoot(){  
         // 手枪射击
    }
    
    public void kill(){    
        // 手枪杀人
    }
}
public class Rifle extends AbstractGun{
    public void shoot(){
         // 步枪射击
    }
    
    public void kill(){    
         // 步枪杀人
    }
}

public class ToyGun extends AbstractGun{
    public void shoot(){
        // 玩具枪射击
    }
    
    public void kill(){ 
        // 因为玩具枪不能杀人，就返回空，或者直接throw一个异常出去
        throw new Exception("我是个玩具枪，惊不惊喜，意不意外，刺不刺激？");
    }
}

class A{
	public int func1(int a, int b){
		return a-b;
	}
}
 
public class Client{
	public static void main(String[] args){
		A a = new A();
		System.out.println("100-50="+a.func1(100, 50));
		System.out.println("100-80="+a.func1(100, 80));
	}
}

class B extends A{
	public int func1(int a, int b){
		return a+b;
	}
	
	public int func2(int a, int b){
		return func1(a,b)+100;
	}
}
 
public class Client{
	public static void main(String[] args){
		B b = new B();
		System.out.println("100-50="+b.func1(100, 50));
		System.out.println("100-80="+b.func1(100, 80));
		System.out.println("100+20+100="+b.func2(100, 20));
	}
}

/**
 * 鸟
 */
public class Bird {
    // 飞行的速度
    private double flySpeed;

    public void setFlySpeed(double flySpeed) {
        this.flySpeed = flySpeed;
    }

    public double getFlyTime(double distance) {
        return distance/flySpeed;
    }
}

/**
 * 燕子
 */
public class Swallow extends Bird{
}

/**
 * 几维鸟
 */
public class Kiwi extends Bird {
    @Override
    public void setFlySpeed(double flySpeed) {
        flySpeed = 0;
    }
}

/**
  * 测试飞行耗费时间
  */
public class BirdTest {
    public static void main(String[] args) {
        Bird bird1 = new Swallow();
        Bird bird2 = new Kiwi();
        bird1.setFlySpeed(120);
        bird2.setFlySpeed(120);
        System.out.println("如果飞行300公里：");
        try {
            System.out.println("燕子花费" + bird1.getFlyTime(300) + "小时.");
            System.out.println("几维花费" + bird2.getFlyTime(300) + "小时。");
        } catch (Exception err) {
            System.out.println("发生错误了!");
        }
    }
}

/**
 * 动物
 */
public class Animal {
    private double runSpeed;

    public double getRunTime(double distance) {
        return distance/runSpeed;
    }

    public void setRunSpeed(double runSpeed) {
        this.runSpeed = runSpeed;
    }
}


/**
 * 鸟
 */
public class Bird {
    // 飞行的速度
    private double flySpeed;

    public void setFlySpeed(double flySpeed) {
        this.flySpeed = flySpeed;
    }

    public double getFlyTime(double distance) {
        return distance/flySpeed;
    }
}

/**
 * 燕子
 */
public class Swallow extends Bird {
}

/**
 * 几维鸟
 */
public class Kiwi extends Animal {
    @Override
    public void setRunSpeed(double runSpeed) {
        super.setRunSpeed(runSpeed);
    }
}

/**
  * 测试飞行耗费时间
  */
public class BirdTest {
    public static void main(String[] args) {
        Bird bird1 = new Swallow();
        Animal bird2 = new Kiwi();
        bird1.setFlySpeed(120);
        bird2.setRunSpeed(110);
        System.out.println("如果飞行300公里：");
        try {
            System.out.println("燕子花费" + bird1.getFlyTime(300) + "小时.");
            System.out.println("几维鸟花费" + bird2.getRunTime(300) + "小时。");
        } catch (Exception err) {
            System.out.println("发生错误了!");
        }
    }
}