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Editorial Team
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Asked: 2026-05-22T18:19:51+00:00

Can anyone point me out how the first if works and the second doesn’t?

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Can anyone point me out how the first if works and the second doesn’t? I’m puzzled why the second if-clause isn’t working. I’d like to get a hint, thanks.

String msg = o.getTweet();
        if (msg.indexOf("&") > 0) {
            msg = msg.replaceAll("&", "&");// vervangt & door &
        }
        if (msg.indexOf(""") > 0) {
            msg = msg.replaceAll(""", "aa"); //vervangt " door "
        }
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1 Answer

  1. Editorial Team

    Because ZERO is a very valid index. Try this out,

        String msg = o.getTweet();
    if (msg.indexOf("&") != -1) {
        msg = msg.replaceAll("&", "&");// vervangt & door &
    }
    if (msg.indexOf(""") != -1) {
        msg = msg.replaceAll(""", "aa"); //vervangt " door "
    }

    Explanation:

    The documentation of String.indexOf(String str) explains that, “if the string argument occurs as a substring within this object, then the index of the first character of the first such substring is returned; if it does not occur as a substring, -1 is returned.” – [link to docs]

    This can be done as simple as below, as OpenSauce pointed out here.

    msg = msg.replace("&", "&").replace(""", "\"");

    Useful links:

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