数据结构与算法之猫狗队列

一时失言乱红尘 2021-12-24 00:59 280阅读 0赞

# 数据结构与算法之猫狗队列 #

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## 目录 ##

1.  猫狗队列

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### 1. 猫狗队列 ###

1.  描述  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTkxMDY5NA_size_16_color_FFFFFF_t_70]
2.  代码实现

import java.util.LinkedList;
    import java.util.Queue;
    
    public class Code_DogCatQueue {
        
    
    	public static class Pet {
        
    		private String type;
    
    		public Pet(String type) {
        
    			this.type = type;
    		}
    
    		public String getPetType() {
        
    			return this.type;
    		}
    	}
    
    	public static class Dog extends Pet {
        
    		public Dog() {
        
    			super("dog");
    		}
    	}
    
    	public static class Cat extends Pet {
        
    		public Cat() {
        
    			super("cat");
    		}
    	}
    
    	public static class PetEnterQueue {
        
    		private Pet pet;
    		private long count;
    
    		public PetEnterQueue(Pet pet, long count) {
        
    			this.pet = pet;
    			this.count = count;
    		}
    
    		public Pet getPet() {
        
    			return this.pet;
    		}
    
    		public long getCount() {
        
    			return this.count;
    		}
    
    		public String getEnterPetType() {
        
    			return this.pet.getPetType();
    		}
    	}
    
    	public static class DogCatQueue {
        
    		private Queue<PetEnterQueue> dogQ;
    		private Queue<PetEnterQueue> catQ;
    		private long count;
    
    		public DogCatQueue() {
        
    			this.dogQ = new LinkedList<PetEnterQueue>();
    			this.catQ = new LinkedList<PetEnterQueue>();
    			this.count = 0;
    		}
    
    		public void add(Pet pet) {
        
    			if (pet.getPetType().equals("dog")) {
        
    				this.dogQ.add(new PetEnterQueue(pet, this.count++));
    			} else if (pet.getPetType().equals("cat")) {
        
    				this.catQ.add(new PetEnterQueue(pet, this.count++));
    			} else {
        
    				throw new RuntimeException("err, not dog or cat");
    			}
    		}
    
    		public Pet pollAll() {
        
    			if (!this.dogQ.isEmpty() && !this.catQ.isEmpty()) {
        
    				if (this.dogQ.peek().getCount() < this.catQ.peek().getCount()) {
        
    					return this.dogQ.poll().getPet();
    				} else {
        
    					return this.catQ.poll().getPet();
    				}
    			} else if (!this.dogQ.isEmpty()) {
        
    				return this.dogQ.poll().getPet();
    			} else if (!this.catQ.isEmpty()) {
        
    				return this.catQ.poll().getPet();
    			} else {
        
    				throw new RuntimeException("err, queue is empty!");
    			}
    		}
    
    		public Dog pollDog() {
        
    			if (!this.isDogQueueEmpty()) {
        
    				return (Dog) this.dogQ.poll().getPet();
    			} else {
        
    				throw new RuntimeException("Dog queue is empty!");
    			}
    		}
    
    		public Cat pollCat() {
        
    			if (!this.isCatQueueEmpty()) {
        
    				return (Cat) this.catQ.poll().getPet();
    			} else
    				throw new RuntimeException("Cat queue is empty!");
    		}
    
    		public boolean isEmpty() {
        
    			return this.dogQ.isEmpty() && this.catQ.isEmpty();
    		}
    
    		public boolean isDogQueueEmpty() {
        
    			return this.dogQ.isEmpty();
    		}
    
    		public boolean isCatQueueEmpty() {
        
    			return this.catQ.isEmpty();
    		}
    
    	}
    
    	public static void main(String[] args) {
        
    		DogCatQueue test = new DogCatQueue();
    
    		Pet dog1 = new Dog();
    		Pet cat1 = new Cat();
    		Pet dog2 = new Dog();
    		Pet cat2 = new Cat();
    		Pet dog3 = new Dog();
    		Pet cat3 = new Cat();
    
    		test.add(dog1);
    		test.add(cat1);
    		test.add(dog2);
    		test.add(cat2);
    		test.add(dog3);
    		test.add(cat3);
    
    		test.add(dog1);
    		test.add(cat1);
    		test.add(dog2);
    		test.add(cat2);
    		test.add(dog3);
    		test.add(cat3);
    
    		test.add(dog1);
    		test.add(cat1);
    		test.add(dog2);
    		test.add(cat2);
    		test.add(dog3);
    		test.add(cat3);
    		while (!test.isDogQueueEmpty()) {
        
    			System.out.println(test.pollDog().getPetType());
    		}
    		while (!test.isEmpty()) {
        
    			System.out.println(test.pollAll().getPetType());
    		}
    	}
    
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTkxMDY5NA_size_16_color_FFFFFF_t_70]: /images/20211223/04c73058c5cf4e20a904493a9dde3d71.png