《代码大全》看到“表驱动法”一章，以下是表驱动法的第一个方法——直接访问表

 

import java.util.Scanner;import java.util.Calendar;class DaysPerMonth {    public static void main(String[] args) {                System.out.println("输入年份：");        Scanner scan = new Scanner(System.in);        String input_year = scan.nextLine();        int year = Integer.parseInt(input_year);        System.out.println("输入月份：");        String input_month = scan.nextLine();        int month = Integer.parseInt(input_month);        int days = daysPerMonth(year, month);        System.out.println( year + " 年 " + month + " 月有 " + days + "天");    }    public static int daysPerMonth(int year, int month) {                boolean flag = LeapYearIndex(year);        System.out.println("是否是闰年？" + flag);        if(flag) {            int[] days = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};            return days[month-1];        } else {            int[] days = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};            return days[month-1];        }    }    public static boolean LeapYearIndex(int year) {        if ( ( year % 4 == 0 && year % 100 != 0 ) || year % 400 == 0 ) {            return true;        } else {            return false;        }    }}