Java2

//
import java.time.Instant;

/**
 * Created by Administrator on 2018/9/26.
 */
import java.util.*;
public class mian {
    public static void main(String arge[]) {
        System.out.println("请输入年份");
        Scanner in = new Scanner(System.in);
        int year;
        year = in.nextInt();
        if (year % 4 == 0 && year % 400 == 0) {
            System.out.println("是闰年");
        }
        if (year % 100 != 0) {
            System.out.println("是平年");
        } else {
            System.out.println("是闰年");
        }
        System.out.println("请输入月份");
        int month;
        month= in.nextInt();

        switch(month){
            case 2:
                System.out.println( month + "月有28");
                break;
            case 1:
                break;
            case 3:
                break;
            case 5:
                break;
            case 7:
                break;
            case 8:
                break;
            case 10:
                break;
            case 12:
                System.out.println(month + "月有31");
                break;
            default:
                System.out.println( month + "月有30");
                break;
        }

    }
}

 * Created by Administrator on 2018/9/26.
 */
public class lian
{
    public static void main(String arge[]){
        int a=10;
        double x=2.3;
        double c=x+a;
        int u=(int)x+a;
        boolean t=2>8||9>2;//或运算
        boolean v=2>8&&9>2;//与运算
        int r=10;
        ++a;
        r++;
        a--;
        --r;
        System.out.println(a++);
        System.out.println(++r);
        System.out.println(u%x);
        System.out.println(Math.atan(-x));
    }
}
//import java.time.Instant;

/**
 * Created by Administrator on 2018/9/26.
 */
import java.util.*;
public class mian {
    public static void main(String arge[]){
        int month;
        System.out.println("请输入");
        Scanner in=new Scanner(System.in);
        int year;
        year = in.nextInt();
        if(year%4==0&&year%400==0){
            System.out.println("是闰年");
        }
        if (year%100!=0){
            System.out.println("是平年");
        }
        else
            System.out.println("是闰年");

    }
}