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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. StringBuilder sb1 = new StringBuilder("Cъешь еще этих");
  13. StringBuilder sb2 = sb1;
  14. sb2.append(" мягких булок");
  15. sb1 += new StringBuilder(" мягких булок");
  16. System.out.println(sb1);
  17. }
  18. }
Compilation error #stdin compilation error #stdout 0.05s 4386816KB
stdin
Standard input is empty
compilation info
Main.java:15: error: bad operand types for binary operator '+'
		sb1 += new StringBuilder(" ?????? ?????");
		    ^
  first type:  StringBuilder
  second type: StringBuilder
1 error
stdout
Standard output is empty