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  1. import java.util.*;
  2. class Main {
  3.     static final char DELIM = ';';
  4.     static final char ESCAPE = ':';
  5.     public static void main(String[] args) {
  6.         String a = "abc;def";
  7.         String b = "ja:3fr";
  8.         String c = ";";
  9.         String d = "";
  10.         String e = ":";
  11.         String f = "83;:;:;;;;";
  12.         String g = ":;";
  13.  
  14.         String concat = concat(a,b,c,d,e,f,g);
  15.  
  16.         String[] tokens = split(concat);
  17.  
  18.         int pos = 0;
  19.         System.out.println(test(a,tokens[pos++]));
  20.         System.out.println(test(b,tokens[pos++]));
  21.         System.out.println(test(c,tokens[pos++]));
  22.         System.out.println(test(d,tokens[pos++]));
  23.         System.out.println(test(e,tokens[pos++]));
  24.         System.out.println(test(f,tokens[pos++]));
  25.         System.out.println(test(g,tokens[pos++]));
  26.     }
  27.  
  28.     static String concat(String... ss) {
  29.         StringBuilder sb = new StringBuilder();
  30.         final String e = String.valueOf(ESCAPE);
  31.         final String ee = e + ESCAPE;
  32.         final String d = String.valueOf(DELIM);
  33.         final String ed = e + d;
  34.         for(String s : ss) {
  35.             String r = s.replace(e, ee).replace(d, ed);
  36.             System.out.println(s + " becomes " + r);
  37.             sb.append(r).append(d);
  38.         }
  39.  
  40.         String fp = sb.toString().substring(0,sb.length() - 1);
  41.         System.out.println("Final product:");
  42.         System.out.println(fp);
  43.         return fp; // trim off the last delim
  44.     }
  45.  
  46.     static String[] split(String concat) {
  47.         List<String> tokens = new ArrayList<String>();
  48.         StringBuilder sb = new StringBuilder();
  49.         boolean escaped = false;
  50.         for(int i = 0; i < concat.length(); i++) {
  51.             char c = concat.charAt(i);
  52.             if(c == ESCAPE && !escaped) {
  53.                 escaped = true;
  54.                 continue;
  55.             }
  56.             if(c == DELIM && !escaped) {
  57.                 tokens.add(sb.toString());
  58.                 sb = new StringBuilder();
  59.                 continue;
  60.             }
  61.             sb.append(c);
  62.             escaped = false;
  63.         }
  64.         tokens.add(sb.toString());
  65.         return tokens.toArray(new String[0]);
  66.     }
  67.  
  68.     static String test(String exp, String act) {
  69.         return "Expected '" + exp + "', Actual '" + act + "', Matches " + exp.equals(act);
  70.     }
  71. }
Success #stdin #stdout 0.03s 245632KB
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stdin
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Standard input is empty
stdout
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abc;def becomes abc:;def
ja:3fr becomes ja::3fr
; becomes :;
 becomes 
: becomes ::
83;:;:;;;; becomes 83:;:::;:::;:;:;:;
:; becomes :::;
Final product:
abc:;def;ja::3fr;:;;;::;83:;:::;:::;:;:;:;;:::;
Expected 'abc;def', Actual 'abc;def', Matches true
Expected 'ja:3fr', Actual 'ja:3fr', Matches true
Expected ';', Actual ';', Matches true
Expected '', Actual '', Matches true
Expected ':', Actual ':', Matches true
Expected '83;:;:;;;;', Actual '83;:;:;;;;', Matches true
Expected ':;', Actual ':;', Matches true
https://ideone.com/wUlyz
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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