Help in debugging the string concatenation code

Posted by mithun1538 on Stack Overflow See other posts from Stack Overflow or by mithun1538
Published on 2010-04-16T10:50:28Z Indexed on 2010/04/16 10:53 UTC
Read the original article Hit count: 258

Filed under:

concatenation

|

string-concatenation

|

java

|

debugging

I have a code to concatenate strings. However, for some reason, the final string is not a combination of the required strings. Consider the following code :

//cusEmail is of type String[]
String toList = "";
    for(i=0; i < cusEmail.length - 1; i++) {
        toList.concat(cusEmail[i]);
        toList.concat("; ");
        System.out.println(cusEmail[i]);
    }
    toList.concat(cusEmail[i]);
    System.out.println(toList);

The first sout statement displays the strings in cusEmail[i] correctly. However, once concatenated, the second sout displays a blank / empty. Any reason for this? Am i concatenating it correctly?

© Stack Overflow or respective owner

Related posts about concatenation

Concatenation of fields in different rows

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm stuck on an aggregation problem that I can't get to the bottom of. I have some data which is best summarized as follows id |phraseId|seqNum|word ========================= 1 |1 |1 |hello 2 |1 |2 |world 3 |2 |1 |black 4 |2 |2 |and 5 |2 |3 … >>> More
When should I use String.Format or String.Concat instead of the concatenation operator?

as seen on Stack Overflow - Search for 'Stack Overflow'
In C# it is possible to concatenate strings in several different ways: Using the concatenation operator: var newString = "The answer is '" + value + "'."; Using String.Format: var newString = String.Format("The answer is '{0}'.", value); Using String.Concat: var newString = String.Concat("The… >>> More
T-SQL Tuesday # 16 : This is not the aggregate you're looking for

as seen on SQL Blog - Search for 'SQL Blog'
This week, T-SQL Tuesday is being hosted by Jes Borland ( blog | twitter ), and the theme is " Aggregate Functions ." When people think of aggregates, they tend to think of MAX(), SUM() and COUNT(). And occasionally, less common functions such as AVG() and STDEV(). I thought I would write a quick… >>> More
Concatenation Operator - PHP

as seen on Stack Overflow - Search for 'Stack Overflow'
This might be a silly question but it struck me, and here i ask. <?php $x="Hi"; $y=" There"; $z = $x.$y; $a = "$x$y"; echo "$z"."<br />"."$a"; ?> $z uses the traditional concatenation operator provided by php and concatenates, conversely $a doesn't, My questions: a. by… >>> More
String concatenation within INFORMIX-SQL "Perform" screens.

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I concatenate two char columns within a perform screen? example: table sample col1 char(1), col2 char(1) . . after editadd of sample let label_3 = sample.col1 + sample.col2 .. this didn't work, I even tried using subscripts for the 2 cols but no dice! >>> More

Related posts about string-concatenation

vb.net string concatenation string + function output + string = string + function output and no more

as seen on Stack Overflow - Search for 'Stack Overflow'
The following output produces a string with no closing xml tag. m_rFlight.Layout = m_rFlight.Layout + "<G3Grid:Spots>" + Me.gvwSpots.LayoutToString() + "</G3Grid:Spots>" This following code works correctly m_rFlight.Layout = m_rFlight.Layout + "<G3Grid:Spots>" + Me.gvwSpots.LayoutToString() m_rFlight… >>> More
Difference in String concatenation performance

as seen on Stack Overflow - Search for 'Stack Overflow'
I know you should use a StringBuilder when concatenating strings but I was just wondering if there is a difference in concatenating string variables and string literals. So, is there a difference in performance in building s1, s2, and s3? string foo = "foo"; string bar = "bar"; string s1 = "foo"… >>> More
String concatenation within INFORMIX-SQL "Perform" screens.

as seen on Stack Overflow - Search for 'Stack Overflow'
How can I concatenate two char columns within a perform screen? example: table sample col1 char(1), col2 char(1) . . after editadd of sample let label_3 = sample.col1 + sample.col2 .. this didn't work, I even tried using subscripts for the 2 cols but no dice! >>> More
t-sql string concatenation

as seen on Stack Overflow - Search for 'Stack Overflow'
i have a table that has following column Type -------- type 1 type 2 type 3 How can i convert the above to a string like ('type 1', 'type 2', 'type 3') I want to use the output in my t-sql query with IN clause. Something like select * from TableA where SomeColumn IN ('Type 1','Type 2', Type 3') I… >>> More
how to create a string literal as a function argument via string concatenation in c

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to pass a string literal to a function myfunction("arg1" CONSTANT "arg1"); now part of that constructed string literal needs to be a function return stmp = createString(); myfunction("arg1" stmp "arg2"); is there any way to do this in one line? myfunction("arg1" createString() "arg2");… >>> More