how can I use conditions in switch statement

well?:rolleyes:

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

VB Code:

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

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. ;)

Code:

---

  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;     
  }
  }

---

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

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

Code:

---


  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");
    }
  }
  }
 }

---

So basically Java doesnt support that? right?


umm tnx for the help btw :D :) :) :)

Quote:

---

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...

Code:

---

int a = 1, b = 1;

switch (a)
{
    case 1: //legal

    case 1.5: //illegal - not an integral

    case b: //illegal - not a constant
}

---

:)