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string in switch case

 
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string in switch case, How to switch-case on string
kornni
4 Jan, 2009 - 07:00 AM
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Hi All

I want to switch statement on string, But I don't know

I know only use if-else but my teacher not use if-else he want switch-case

CODE
  switch(Name){
                case "S0":
                    if(input == '0' )
                        Name = "S1";  //input 0 next state = S1
                    else if (input == '1')
                        Name = "S0";  //input 1 next state = S0
                    break;
                case "S1":
                    if(input == '0')
                        Name = "S1";
                    else
                        Name = "S2";
                    break;
            default:
                    break;
        }
        return Name;              
    }
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ayman_mastermind
RE: String In Switch Case
4 Jan, 2009 - 07:14 AM
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actually you cant use switch statements on strings, you could use them either on numbers or on chars. so one solution is to convert your string into char and use single quotes ' ' or you will have to create a map with the strings as keys and integer values indexing an array of integers as values that you can use as indices for the switch statement. Hope that helps, good luck in your programming wink2.gif
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baavgai
RE: String In Switch Case
4 Jan, 2009 - 08:10 AM
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Sorry, switch doesn't work with string.

Don't worry, switch is almost always a poor choice, anyway. It lacks flexibility and, as you've seen, has some major limitations. Here's the logic you offered in a standard if-then:

java

if(Name.equals("S0") && input=='0') {
	Name = "S1";
} else if(Name.equals("S1") && input!='0') {
	Name = "S2";
}


edit: oops'd my if


This post has been edited by baavgai: 4 Jan, 2009 - 08:25 AM
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macosxnerd101
RE: String In Switch Case
4 Jan, 2009 - 02:33 PM
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The only datatypes you can use a switch on are: char, byte, short and int. Simply use a series of if statements in its place for your problem. You can, for other problems, do something like:
CODE

String x = "123";
for(int i = 0; i < x.length(); i++){
  switch(x.charAt(i)){
         //Code Here
         }
   }
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Locke
RE: String In Switch Case
4 Jan, 2009 - 03:42 PM
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QUOTE(kornni @ 4 Jan, 2009 - 07:00 AM) *
I know only use if-else but my teacher not use if-else he want switch-case


Then...honestly, he's a bit of an idiot if he told you to use switch-case on Strings themselves.
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