student-management/src/main/java/com/student/service/StatService.java

package com.student.service;

import com.student.bean.DashboardStats;
import com.student.dao.StatDao;
import com.student.dao.impl.StatDaoImpl;

import java.util.Map;

public class StatService {

    private final StatDao statDao;

    public StatService() {
        this(new StatDaoImpl());
    }

    StatService(StatDao statDao) {
        this.statDao = statDao;
    }

    public DashboardStats getDashboard() {
        return statDao.getDashboardStats();
    }

    public Map<String, Integer> genderDistribution() {
        return statDao.genderDistribution();
    }

    public Map<String, Integer> ageDistribution() {
        return statDao.ageDistribution();
    }

    public Map<String, Integer> deptDistribution() {
        return statDao.deptDistribution();
    }
}