Java 40. Các dạng kế thừa trong Java

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Video giải thích chi tiết

 Ví dụ kế thừa đơn 

  
public class Animal {
	protected String name;
	public Animal(String name) {
		this.name = name;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
	public void eat() {
		System.out.println("I'm eating");
	}
}
  

  
public class Dog extends Animal{
	public Dog() {
		super("Dog");
	}
	
	public void bark() {
		System.out.println("Gau gau");
	}
}
  

  
public class Test {
	public static void main(String[] args) {
		Dog d = new Dog();
		d.eat();
		d.bark();
	}
}
  

 Ví dụ kế nhiều tầng 

  
public class Animal {
	protected String name;
	public Animal(String name) {
		this.name = name;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
	public void eat() {
		System.out.println("I'm eating");
	}
}
  

  
public class Dog extends Animal{
	public Dog() {
		super("Dog");
	}
	
	public void bark() {
		System.out.println("Gau gau");
	}
}
  

  
public class BabyDog extends Dog{
	public BabyDog() {
		super();
	}
	public void weep() {
		System.out.println("Ẳng Ẳng");
	}
}
  

public class Test {
	public static void main(String[] args) {
		System.out.println("Kiểm tra");
		BabyDog bbd = new BabyDog();
		bbd.eat();
		bbd.bark();
		bbd.weep();
	}
}
  

 Ví dụ kế thừa đơn 

   
public class Animal {
	protected String name;
	public Animal(String name) {
		this.name = name;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
	public void eat() {
		System.out.println("I'm eating");
	}
}
  

   
public class Dog extends Animal{
	public Dog() {
		super("Dog");
	}
	
	public void bark() {
		System.out.println("Gau gau");
	}
}
  

   
public class Cat extends Animal{
	public Cat() {
		super("Cat");
	}
	
	public void meow() {
		System.out.println("Meo meo");
	}
}
  

   
public class Bird extends Animal{
	public Bird() {
		super("Bird");
	}
	
	public void fly() {
		System.out.println("I'm flying");
	}
}
  

   
public class Test {
	public static void main(String[] args) {
		Dog d = new Dog();
		d.eat();
		d.bark();
		
		Cat c = new Cat();
		c.eat();
		c.meow();
		
		Bird b = new Bird();
		b.eat();
		b.fly();
	}
}