정샘@IT.블로거

package net.jeongsam.petshop;

import java.util.ArrayList;
import java.util.Random;

class CountTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		int maleTeachers = 0;
		int femaleTeachers = 0;
		int maleStudents = 0;
		int femaleStudents = 0;
		
		Student s = null;
		Teacher t = null;
		ArrayList persons = new ArrayList();
		
		for (int i = 0; i < 500; i++) {
			switch (new Random().nextInt(5)) {
			case 0:
			case 1:
			case 2:
			case 3:
				s = new Student();
				s.setGender((new Random().nextInt(2) == 0) ? 'M' : 'F');
				persons.add(s);
				break;
			default:
				t = new Teacher();
				t.setGender((new Random().nextInt(2) == 0) ? 'M' : 'F');
				persons.add(t);
				break;
			}
		}
		
		for (Person p : persons) {
			if (p instanceof Teacher && p.getGender() == 'M') {
				maleTeachers++;
			} else if (p instanceof Teacher && p.getGender() == 'F') {
				femaleTeachers++;
			} else if (p instanceof Student && p.getGender() == 'M') {
				maleStudents++;
			} else {
				femaleStudents++;
			}
		}
		
		System.out.println("남자 강사의 수 : " + maleTeachers + "명");
		System.out.println("여자 강사의 수 : " + femaleTeachers + "명");
		System.out.println("남자 수강생의 수 : " + maleStudents + "명");
		System.out.println("여자 수강생의 수 : " + femaleStudents + "명");
	}
}