Java - What is the output: string switch and null case value

Question

What is the output of the following code.

public class Main {

  public static void main(String[] args) {

    String switchValue = "1";

    switch (switchValue) {

    case "1":
      System.out.println("in case 1");
    case "2":
      System.out.println("in case 2");
    case null :
      System.out.println("in case null"); 

    default:
      System.out.println("in default");
    }
  }
}

Compilation error: constant expression required!

Note

You cannot use null in string switch case constant.

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