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QuestionWhy am I getting an error concatenating a String in java 16? Pin
Toml61828-Nov-21 7:13
Toml61828-Nov-21 7:13 
I am trying to extract date from a String (Line), to do a Date conversion, but my String concatenation (#1) gives incorrect result.
Adding a blank ("") at the start (#2) gives the correct result.
Why is this? Where does the "105" come from?


Java
//=========================================================
System.out.println("Line= " + Line);

char ch1 = Line.charAt(0), ch2 = Line.charAt(1);
char ch4 = Line.charAt(3), ch5 = Line.charAt(4);
char ch7 = Line.charAt(6), ch8 = Line.charAt(7),
     ch9 = Line.charAt(8), ch10 = Line.charAt(9) ;
System.out.println("Text date= " + ch1 + ch2 + '/' + ch4 + ch5 + '/' +
     ch7+ ch8+ch9+ch10);

//#1 concatenate is wrong
String sDate1= ch1 + ch2 + "/" + ch4 + ch5 + '/' +
         ch7+ ch8+ch9+ch10;
System.out.println("Not correct: sDate1= " + sDate1);

//#2: For some reason, adding a blank at the start gives correct result
String sDate2= "" + ch1 + ch2 + "/" + ch4 + ch5 + '/' +
     ch7+ ch8+ch9+ch10;
System.out.println("Correct:     sDate2= " + sDate2);
//=============================================================


Output:
Line= 09/12/2021
Text date= 09/12/2021
Not correct: sDate1= 105/12/2021
Correct: sDate2= 09/12/2021
AnswerRe: Why am I getting an error concatenating a String in java 16? Pin
Gerry Schmitz28-Nov-21 8:58
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QuestionRe: Why am I getting an error concatenating a String in java 16? Pin
Richard MacCutchan28-Nov-21 9:13
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AnswerRe: Why am I getting an error concatenating a String in java 16? Pin
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