using Switch and strings java

Question

I've heard that you can use switch on strings, but Im not getting it to work. ToDo would in this case be a user input String, but my compiler tells me "int cannot be converted into String". Can anybody tell me what I'm doing wrong?

class Comands {
  public Comands () {} 

  public void doSomething (String toDo){

    while (!(toDo.equals("quit"))) {
      switch (toDo) {
        case 1: toDo.equals("right");
        System.out.println("go right");
        break;

        case 2: toDo.equals("left");
        System.out.println("go left");
        break;
      }
    }
  }
}

case "right": System.out.println("go right"); break; case "left":... — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Nov 29, 2014 at 21:12
See also the Java Tutorial on strings in switch statements (at the bottom of the page): docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html — Jeffrey Bosboom
– Jeffrey Bosboom, Commented Nov 29, 2014 at 21:15

ihsan · Accepted Answer · 2014-11-29 21:15:26Z

3

Like @Hovercraft Full Of Eels mentioned, you are comparing your string with integer in case 1:, this should contain a string like this:

...
case "left":
    // sysout();
    break;
case "right":
    // sysout();
    break;
...

answered Nov 29, 2014 at 21:15

ihsan

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Petr Duchek · Accepted Answer · 2014-11-29 21:16:30Z

1

 switch (toDo) {
    case "right":
    System.out.println("go right");
    break;

    case "left":
    System.out.println("go left");
    break;
  }

Note: Only in Java SE 7 and later, you can use a String object in the switch statement's expression.

More info here.

answered Nov 29, 2014 at 21:16

Petr Duchek

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3 Comments

user4091380 Over a year ago

Do you know if it is possible to do ignoreCase somehow?

August Over a year ago

@stian You need to use if statements if you want to ignore case.

khelwood Over a year ago

@stian It's not possible to use ignoreCase, but you can do switch (toDo.toLowerCase()) so that you know your string will be lower case.

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