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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String a = "";
  13. 		String b = "";
  14.  
  15. 		System.out.println(a - b);
  16. 	}
  17. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:15: error: bad operand types for binary operator '-'
		System.out.println(a - b);
		                     ^
  first type:  String
  second type: String
1 error
stdout
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Standard output is empty
https://ideone.com/IHTf8X
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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