ex3_5.java

判断三角形

//3.5（查找当月的天数）
import javax.swing.JOptionPane;
public class Ex3_5{
	public static void main (String[] args) {
        int year,month,numofday=0;
        year=Integer.parseInt(JOptionPane.showInputDialog("输入年份："));
        month=Integer.parseInt(JOptionPane.showInputDialog("输入月份："));
        switch(month){//根据不同情况得到每个月的天数
          case 1:
          case 3:
          case 5:
          case 7:
          case 8:
          case 10:
          case 12:numofday=31;  break;
          case 4:
          case 6:
          case 9:
          case 11:numofday=30; break;
     	  case 2:     if((year%400)==0||(year%4==0&&year%100!=0))
     	                numofday=29;
     	              else
     	                numofday=28;
     	  break;
        }
        System.out.println(year+"年"+month+"月共有"+numofday+"天");
        System.exit(0);
    }
}