String＃replace在我的方法中不起作用

Question

As I get an HTML file containing some wild chars like ⋍ or 𖫻 , I want to replace them with a bullet. So I wrote this method :

public String replaceAmps(String initial)
{
    // This list will contain all the &amps; to replace.
    ArrayList<String> amps = new ArrayList<String>();
    String res = initial;
    int index = initial.indexOf("&amp;");
    // Get all the indexes of &amp.
    while (index >= 0) 
    {
        StringBuilder stb = new StringBuilder("&amp;");
        // Create a String until the next ";", for example &amp;#1091;<- this one
        for(int i = index+5 ; initial.charAt(i) != ';' ; i++) stb.append(initial.charAt(i));
        stb.append(";");
        // Add the amp if needed in the list.
        if(!amps.contains(stb.toString())) amps.add(stb.toString());
        index = initial.indexOf("&amp;", index + 1);
    }
    // Replace the Strings from the list with a bullet.
    for(String s : amps) res.replace(s, "•");
    return res;
}

I correctly get all the amps in my list, but the replacing doesn't work. Why? Thanks for your help.

Answer 1

Strings are immutable; the replace method returns a new String as the result of the replacement and does not modify res . Try

for(String s : amps) res = res.replace(s, "•");