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  1. class Main {
  2.     public static void main(String[] args) {
  3.         int x = 2;
  4.         int y = 2;
  5.         switch(x) {
  6.             case 1: break;
  7.             case y: break;
  8.         }
  9.     }
  10. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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1
2
10
42
11
compilation info 
Main.java:7: error: constant expression required
            case y: break;
                 ^
1 error
stdout
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Standard output is empty
https://ideone.com/wAXMZ
language:
Java (12.0.1)
created:
11 years ago
visibility:
secret

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