Java8获取List集合元素最大、最小、总和、平均值

public static void main(String[] args) {
        initEmp();
        int sum = empList.stream().mapToInt(Employee->Employee.getAge()).sum();
        int max = empList.stream().mapToInt(Employee->Employee.getAge()).max().getAsInt();
        int min = empList.stream().mapToInt(Employee->Employee.getAge()).min().getAsInt();
        double avg = empList.stream().mapToInt(Employee->Employee.getAge()).average().getAsDouble();
        System.out.println("最大值："+max+"\n最小值："+min+"\n总和："+sum+"\n平均值："+avg);
}