public class Main {
  public static void main(String[] args)  
  {  
      String s = "$myvar";
      String r = replaceVars(s);
      System.out.println(r);  
  }  
 
  public static String replaceVars(String source)  
  {  
      String[][] varNames = new String[][]{new String[]{"myvar", "This is a variable"},
                                           new String[]{"anothervar", "This is another variable"},
                                          new String[]{"yetanothervar", "This is yet another variable"}};  
      for(String[] s : varNames) {
        if (source.substring(1).equals(s[0])) {
          source = s[1];
        }
      }
      return source;
  }
}

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