我该如何处理由函数与数ArrayList中，和组

我是处理员工的ArrayList中，并通过员工的数量需要通过函数的用法组，算在职职工和计数不活动的员工。我知道如何全过程，但如何通过函数处理与组ArrayList中。

public class Employee {
    private String name;
    private String department;
    private String status;
    public Employee(String name, String department, String status) {
        this.setName(name);
        this.setDepartment(name);
        this.setStatus(status);
    }
    public String getName() {
        return name;
    }
    public String getDepartment() {
        return department;
    }
    public void setName(String name) {
        this.name = name;
    }
    public void setDepartment(String department) {
        this.department = department;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
}

ArrayList<Employee> listEmployee = new ArrayList<Employee>();
listEmployee.add(new Employee("Ravi", "IT", "active"));
listEmployee.add(new Employee("Tom", "Sales", "inactive"));
listEmployee.add(new Employee("Kanna", "IT", "inactive"));

int count = 0;
for (Employee e : listEmployee) {
    count++;
}
System.out.println("Count of Employees" + count);

这是上面的代码我试图让员工数

int count = 0;
for (Employee e : listEmployee) {
    count++;
}
System.out.println("Count of Employees" + count);

请帮忙按部门的分组我来处理数据

我期待下面的输出来：

Department total activeCount inactiveCount
IT         2     1           1
Sales      1     0           1