how can I use conditions in switch statement

[MrPolite]

well?

also something like this (I'm showing the VB example, hope someone can tell me how to do this in java )

Select case num
       case is > 5
             ' do something
     
       ' ......
end select

[Dillinger4]

Here is some code that i had which contains a switch statement.
The main thing to remember when using switch statements is that the expression associated with it must have a byte, char, short or int value. The floting point and boolean types are not supported, and neither is long, even though long is an integer type.

  import java.io.*; 
  import java.util.*;
  
 class VowelGrabber{ 
    public static void main(String[] args){

   try{
   File f = new File("C://Java/text.txt");
   BufferedReader buff = new BufferedReader(new FileReader(f));
   
   while(true){
       String x = buff.readLine();
        if(x == null) break; 
         x.toLowerCase(); 
          StringTokenizer st = new StringTokenizer(x); 
            while(st.hasMoreTokens()){
               grabVowels(st.nextToken()); 
            }
    }
   }catch(IOException e){System.err.println(e);}
  }
   public static void grabVowels(String s){
      int numofvowels = 0; 
  
      for(int i = 0; i < s.length(); ++i){
       char c = s.charAt(i);  
       switch(c){
        case 'a': 
            numofvowels++;
             break;
        case 'e': 
            numofvowels++;
             break;
        case 'i': 
            numofvowels++;
              break;
        case 'o': 
            numofvowels++;
              break;
        case 'u': 
            numofvowels++;
              break;
        }
      } 
     System.out.println(" String " + s + " encountered " + numofvowels + " vowels ");
     numofvowels = 0;      
   }
  }

[MrPolite]

tnx Dilenger4 for the reply, but I'm looking for something that does exactly the same thing as the VB code that I posted I know how to use the case the way you said it, but I want it to check for a condition, kinda like an if statement. see the example in the first post plz
thank you

[Dillinger4]

I guess i would juast wrap up the switch statement in an if.

  public class test{
   public static void main(String[] args){
      selectCase(12);
  }
  public static void selectCase(int i){
   if(i > 5){
    switch(i){     
      case 6: System.out.println("six"); 
      break; 
      case 7: System.out.println("seven"); 
      break; 
      default: 
      System.out.println("number is greater then 5 but not six or seven"); 
    }
   }
  }
 }

[MrPolite]

So basically Java doesnt support that? right?


umm tnx for the help btw

[crptcblade]

Originally posted by MrPolite
So basically Java doesnt support that? right?

Correct...in Java, as well as C/C++ and other languages, the case statements must be a constant integral value. Example...

int a = 1, b = 1;

switch (a)
{
    case 1: //legal

    case 1.5: //illegal - not an integral

    case b: //illegal - not a constant
}