Using Strings with Switch statements

So I have searched around, and read that in the JDK 1.7 it allows for Strings to be used in Switch statements. I am using a book to learn java, and it uses a string with the switch statement. In the book however, it is using NetBeans instead of IntelliJ. Here is my code:

public class Commodity {     public static void main(String[] args) {         String command = "BUY";         int balance = 550;         int quantity = 42;         switch(command) {             case "BUY":                 quantity += 5;                 balance -= 20;                 break;             case "SELL":                 quantity -= 5;                 balance += 15;         }         System.out.println("Balance: " + balance +                 "\n" + "Quantity: " + quantity);         }     }



But I keep getting the error on the switch(command) line. I have the JDK 1.7 and it will still not let me do this. Anyone know how I can do this? Thanks

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