class Person
{
	String name;
	int age;
	public Person(String name,int age) //重載構造方法
	{
		this.name=name;
		this.age=age;
	}
	void Introduce()
	{
		System.out.println("my name is:"+name+"and i'm"+age+"years old");//打印
	}
}
class Student
{
	String name;
	int age;
	String depart;
	public Student(String name,int age)
	{
		this.name=name;
		this.age=age;
		this.depart="CS";
	}
	void Introduce()
	{
		System.out.println("my name is:"+name+"and i'm"+age+"years old");
	}
}
class Monitor
{
	String name;
	int age;
	String depart;
	String job;
	public Monitor(String name,int age)
	{
		this.name=name;
		this.age=age;
		this.depart="CS";
		this.job="Monitor";
	}
	void Introduce()
	{
		System.out.println("my name is:"+name+"and i'm"+age+"years old");
	}
}

public class Test
{
	public static void main (String args[])
	{
		Person person1=new Person("tom",18);
		person1.Introduce();
		Student student1=new Student("jean",19);
		student1.Introduce();
		Monitor monitor1=new Monitor("licon",20);
		monitor1.Introduce();
	}	
}