インタフェースと抽象クラスの典型的な応用例

/*
       ,         


  ：      
  ：  ，  ，  ，  
  ：  ，  ，  ，  

       ，         ，  。

  ：
  ，  
  ();
  (){}

              ，             ，  ，         

    。


      ：      
      ：      

  ：      

  ：  
 */

//      
interface Smoking {
	//        
	public abstract void smoke();
}

//       
abstract class Person {
	private String name;
	private int age;

	public Person() {
	}

	public Person(String name, int age) {
		this.name = name;
		this.age = age;
	}

	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 abstract void eat();

	public void sleep() {
		System.out.println("    ");
	}
}

//      
class Teacher extends Person {
	public Teacher() {
	}

	public Teacher(String name, int age) {
		super(name, age);
	}

	public void eat() {
		System.out.println("    ");
	}
}

//      
class Student extends Person {
	public Student() {
	}

	public Student(String name, int age) {
		super(name, age);
	}

	public void eat() {
		System.out.println("    ");
	}
}

//      
class SmokingTeacher extends Teacher implements Smoking {
	public SmokingTeacher() {
	}

	public SmokingTeacher(String name, int age) {
		super(name, age);
	}

	public void smoke() {
		System.out.println("     ");
	}
}

//      
class SmokingStudent extends Student implements Smoking {
	public SmokingStudent() {
	}

	public SmokingStudent(String name, int age) {
		super(name, age);
	}

	public void smoke() {
		System.out.println("     ");
	}
}

public class InterfaceDemo1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//     
		SmokingStudent ss = new SmokingStudent();
		ss.setName("   ");
		ss.setAge(27);
		System.out.println(ss.getName() + "---" + ss.getAge());
		ss.eat();
		ss.sleep();
		ss.smoke();
		System.out.println("-------------------");

		SmokingStudent ss2 = new SmokingStudent("  ", 30);
		System.out.println(ss2.getName() + "---" + ss2.getAge());
		ss2.eat();
		ss2.sleep();
		ss2.smoke();
	}
}

/*
 *     ：    ---27                 -------------------   ---30                
 */

   ---27
    
    
     
-------------------
  ---30