import java.io.*;

public class Department {
	private int numberStudents;
	private String deptName;
	
	//  default constructor 
	public Department() {
		deptName = "ACAE";
		numberStudents = 100;
	}
	
	// specific constructor 
	public Department(int i, String s) {
		deptName = s;
		numberStudents = i;		
	}
	
	//accessors
	public String getName(){
		return deptName;
	}
	public int getNumber(){
		return numberStudents;
	}
	
	//mutators
	public void setName(String s){
		deptName = s;
	}
	public void setNumber(int n){
		numberStudents = n;
	}
	//main method to use this class
	public static void main(String args[]) throws IOException{
		//construct an object using default constructor
		Department d1 = new Department();
		//output the initial values
		System.out.println("by default, the department name is " + d1.getName());
		System.out.println("by default, the number of students is " + d1.getNumber());
		//using user's input to change the department
		System.out.println("please input the new department name");
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		//get the input, which is a string
		String a = stdin.readLine();		
		//try to use a loop to continue changing the name untill user input s to stop
		while(!a.equals("s")){ //to compare two objects equals or not, use the method, "==" will not work	
			//use a mutator to change the name
		    d1.setName(a);
		    //output the new name
			System.out.println("new department name is " + d1.deptName);
			System.out.println("please input the new department name(input s to stop the loop)");
			a = stdin.readLine();
		}					
	}
}