CODEWITHSUNDEEP
javaarraysstring
masterdany88
masterdany88

Reputation: 5341

Java String. Replace list of chars by other chars list

I have String variable with value- f.e.: this is test-str-ing_łóśżćń.

And I would like replace this chars:

, -, ł,ó,ś,ż,ć,ń with those:

_,_,l,o,s,z,c,n.

And I mean here, that if parser will found f.e.: char - (which is second in first list) should be replaced with char that is in the same position/place in second list, which in this example is: _.

The char ó should be replaced with char o.

The char ń should be replaced with char n.

In my case the list of characters to replace is quite long and parsing in loop for each char to replace would not be enought efficient.

I know method replaceAll(). but it only accept one in String and one out String

So I am looking for method, that will allow me to work on arrays/list of Strings instead of single String.

Please give me some help.

Upvotes: 1

Views: 1520

Answers (3)

RokL
RokL

Reputation: 2812

Make a static lookup table:

private static char[] substitutions = new char[65536];
static {
    // Initialize
    for (char c = 0; c < substitutions.length; c++) {
        substitutions[c] = c;
    }
    // Now add mappings.
    substitions['-'] = '_'; // Map source->target character
    ... // Add the rest
}
// LATER IN Code
char[] stringChars = inputString.toCharArray();
for (int i = 0; i < stringChars.length; i++) {
    stringChars[i] = substitutions[stringChars[i]];
}
outputString = new String(stringChars);

Upvotes: 0

Jacek Cz
Jacek Cz

Reputation: 1906

    char[] out = new char[src.length()];
    for( j ...){
    inputChar = src.charAt(j);
    for (int i = 0; i < convertChars.length; i++) {
       if (inputChar == convertChars[i]) {
         inputChar = toChars[i];
       }
     }
    }
     out[j] = inputChar ;
   }
    out2 = new String(out);

Extracted from bigger code without IDE, not tested. Loop (I hope) don't allocate objects and should not degrade speed.

Upvotes: 1

Joop Eggen
Joop Eggen

Reputation: 109577

Use java.text.Normalizer to Decompose accented letters in base letter plus "combining diacritical marks."

String base = Normalizer.normalize(accented, Form.NFKD)
    .replaceAll("\\p{M}", "");

This does a decompose (D) normalization, and then removes Marks.

Some replacements still needed.

Upvotes: 4

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