How to replace ' with empty string in Java

Question

How can I replace single quote ' with empty string in Java. I tried following but doesn't seem to be working.

String data="Sid's den";
data.replace("'", "");
data.replaceAll("'", "");

Thanks in advance. Any help is much appreciated.(Output should be: Sids den)

Thanks guys for your responses. I guess I should have been more clear about my question. Basically I am getting special characters from the table and with what value we have to replace that also from the same table. Here is snippet of the code:

query = "select spl_char, replace_with from entcon_splchars";
ptsmt = DBConnector.sqlConnection.prepareStatement(query);
rs = ptsmt.executeQuery();

while (rs.next()) {
        if(data.contains(rs.getString("spl_char"))){
          data = data.replace(rs.getString("spl_char"),rs.getString("replace_with"));
            }
         }

so whenevr in the data we have special character ' then I am facing nullpointer exception. Please suggest how to go ahead with this?

Read the doc. data.replace("'", "") would return the new String (not change the current), which is stated in doc: "Returns: The resulting string" — Dmitry Ginzburg
– Dmitry Ginzburg, Commented Jun 3, 2014 at 12:33

Mena · Accepted Answer · 2014-06-03 12:30:47Z

7

Use replace, no need for regex.

Remember that Strings are immutable, so you need to assign data.replace("'", ""); to a variable.

For instance: data = data.replace("'", "");

answered Jun 3, 2014 at 12:30

Mena

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Comments

steffen · Accepted Answer · 2014-06-03 12:56:03Z

4

Strings are immutable so you'll receive a new instance. Try

 data = data.replace("'", "");

Your Edit

Check the return values of getString() - you could get your NPE because your database table contains null values in one of the columns spl_char or replace_with.

edited Jun 3, 2014 at 12:56

answered Jun 3, 2014 at 12:32

steffen

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Comments

Cyclops · Accepted Answer · 2014-06-03 12:50:07Z

3

I can see your problem, If you need to replace it you need to replace it and also need to assign it back to the variable. Solution should be,

        String data="Sid's den";

        data = data.replaceAll("'", "");

        System.out.println(data);

Because String is immutable in java. But StringBuffer and StringBuilder is mutable in java.

String

StringBuffer

StringBuilder

edited Jun 3, 2014 at 12:50

answered Jun 3, 2014 at 12:38

Cyclops

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Comments

hsz · Accepted Answer · 2014-06-03 12:31:36Z

2

Just try with:

"foo'bar'buz".replace("'", "")

Output:

"foobarbuz"

In your case:

String data = "Sid's den";
String output = data.replace("'", "");

answered Jun 3, 2014 at 12:31

hsz

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Comments

ngrashia · Accepted Answer · 2014-06-03 12:31:42Z

1

Try:

data = data.replace ("'", "") ;

OR

data = data.replaceAll("'", "") ;

You would need to assign the replaced string to a variable.

answered Jun 3, 2014 at 12:31

ngrashia

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