java学习第42天2020/8/16

一.

import java.util.Scanner;
public class time {
	int year,month,day;
	time()
	 {
		  year=1000;month=1;day=1;
	 }
	public int isleap()
	{
	 if(year%400==0||year%100!=0&&year%4==0)
	  return 1;
	 else return 0;
	}
	public int check()
	{
		if(month<=12)
		 {
		  if((month==2&&isleap()==1&&day<=29)||(month==2&&isleap()==0&&day<=28)||((month==1||month==3||month==5||month==7||month==8||month==10||month==12)&&day<31)||(month==4||month==6||month==9||month==11&&day==30))
		   return 1;
		  else
		   return 0;
		 }
		 else
		  return 0;
	}
	 public void setdate(int j,int k,int l)
	 {
	  year=j;
	  month=k;
	  day=l;
	 }
	 public void display()
	 {
	  if(check()==0)
		  System.out.println(year+"-"+month+"-"+day+","+"error day");
	  else
	   {
		  System.out.println(year+"-"+month+"-"+day);
	      if(isleap()==1)
	    	  System.out.println(","+"leap day");
	      else
	    	  System.out.println(","+"common year");
	   }
	 }
	 public static void main(String []args)
	 {
		 Scanner input=new Scanner(System.in);
		 time r=new time();
		 System.out.println("请输入两组年月日：");
		 int a,b,c,d,e,f;
		 a=input.nextInt();b=input.nextInt();c=input.nextInt();d=input.nextInt();e=input.nextInt();f=input.nextInt();
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(a,1,1);
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(a,b,1);
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(a,b,c);
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(d,e,f);
		 r.isleap();
		 r.check();
		 r.display();
	 }

}

 

 

 

二.输出后都会换行

使用System.out.println输出换行使用System.out.print输出不换行

package 例题;
import java.util.Scanner;
public class time {
	int year,month,day;
	time()
	 {
		  year=1000;month=1;day=1;
	 }
	public int isleap()
	{
	 if(year%400==0||year%100!=0&&year%4==0)
	  return 1;
	 else return 0;
	}
	public int check()
	{
		if(month<=12)
		 {
		  if((month==2&&isleap()==1&&day<=29)||(month==2&&isleap()==0&&day<=28)||((month==1||month==3||month==5||month==7||month==8||month==10||month==12)&&day<31)||(month==4||month==6||month==9||month==11&&day==30))
		   return 1;
		  else
		   return 0;
		 }
		 else
		  return 0;
	}
	 public void setdate(int j,int k,int l)
	 {
	  year=j;
	  month=k;
	  day=l;
	 }
	 public void display()
	 {
	  if(check()==0)
		  System.out.println(year+"-"+month+"-"+day+","+"error day");
	  else
	   {
		  System.out.print(year+"-"+month+"-"+day);
	      if(isleap()==1)
	    	  System.out.println(","+"leap day");
	      else
	    	  System.out.println(","+"common year");
	   }
	 }
	 public static void main(String []args)
	 {
		 Scanner input=new Scanner(System.in);
		 time r=new time();
		 System.out.println("请输入两组年月日：");
		 int a,b,c,d,e,f;
		 a=input.nextInt();b=input.nextInt();c=input.nextInt();d=input.nextInt();e=input.nextInt();f=input.nextInt();
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(a,1,1);
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(a,b,1);
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(a,b,c);
		 r.isleap();
		 r.check();
		 r.display();
		 r.setdate(d,e,f);
		 r.isleap();
		 r.check();
		 r.display();
	 }

}

 

 

 

三.例题