Question

I wrote this code to calculate the valid day entry—- and in the process i experimented with nesting the switch statement inside the if else statement… in the switch statement.. i further added an if else statement…

And was pretty happy.. with it.. until i .. well.. Compiled it 🙁

it’s giving like 50 errors.. or something… So is this type of nesting invalid??
What all nesting is valid?

The code is as follows

      public DateFour(int m,int d,int y){

      if (y<2011 && y>0){
          year=y;
          if{
              switch(m){
              case 1:case 3 case 5: case 7:case 8:case 10: case 12:
                 month=31;
                 if (day>0 && day<=31){
                 day=d;
                 System.out.println("The date today is:"+day"/"+month+"/"+year);
                  }
                  else{
                      System.out.println("invalid date");
                  }
                  break;
                 case 2:
                             month=28;
                              if (day>0 && day<=28){
                 day=d;
                 System.out.println("The date today is:"+day"/"+month+"/"+year);
                  }
                  else{
                      System.out.println("invalid date");
                  }
                             break;
                             case 4:
                             case 6:
                             case 9:
                             case 11:
                             month =30;
                              if (day>0 && day<=30){
                 day=d;
                 System.out.println("The date today is:"+day"/"+month+"/"+year);
                  }
                  else{
                      System.out.println("invalid date");
                  }
                             default:
                             System.out.println("Invalid month.");

                  }


      }
      }
      else{
          System.out.println("invalid input");

  }
  }

Answer 1

if {

That is not a valid construct in Java. if what?

case 1:case 3 case 5: case 7:case 8:case 10: case 12:

You’re missing a : in there. Please use spacing consistently.

All your print statements are missing a + after day.

Otherwise, yes, you can nest switch and if. It just gets unreadable very, very fast (as you have just noticed).