/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    static Scanner sc=new Scanner(System.in);  
 
    static int year;  
    static int month;  
    public static void main(String[] args){  
        System.out.println("请输入年份：");  
        String ye=sc.next();  
        while(true){  
            if(ye.matches("\\d{4}")){  
                year=Integer.parseInt(ye);  
                break;  
            }else{  
                System.out.println("年份输入错误，请重新输入");  
            }  
        }  
 
        System.out.println("请输入月份：");  
        String mon=sc.next();  
        while(true){  
            if(mon.matches("[1-9]|0[1-9]|1[012]")){  
                month=Integer.parseInt(mon);  
                break;  
            }else{  
                System.out.println("月份输入错误，请重新输入");  
            }  
        }  
 
 
        Calendar cal=Calendar.getInstance();  
        cal.set(year, month-1, 1);  
 
        int day=cal.getActualMaximum(Calendar.DATE);  
        int index=cal.get(Calendar.DAY_OF_WEEK); //判断该月第一天是星期几，输出几个空格  
 
        System.out.println("日"+"\t"+"一"+"\t"+"二"+"\t"+"三"+"\t"+"四"+"\t"+"五"+"\t"+"六"+"\t");  
        for(int i=0;i<index-1;i++){  
            System.out.print(" "+"\t");  
        }  
 
        for(int i=1;i<=day;i++){    //输出该月每天，输出七个换行  
            System.out.print(i+"\t");  
            if((index-1+i)%7==0){  
                System.out.println("");  
            }  
        }  
    }  
}

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MjAxOAo1

2018
5