What is String Tokenizer in Java?

What is String Tokenizer in Java?

  11:58 PM    ssaikgame

---

The string tokenizer class allows an application to break a string into tokens. It is very easy to use.

old way:

String[] result = "this is a test".split("\\s");
     for (int x=0; x<result.length; x++)
         System.out.println(result[x]);

New way:

StringTokenizer st = new StringTokenizer("this is a test");
     while (st.hasMoreTokens()) {
         System.out.println(st.nextToken());
     }

It checks, if there are any more tokens available or not, if TRUE, prints the token, FALSE, terminates the loop.

System.out.println("---- Split by space ------");
  while (st.hasMoreElements()) {
   System.out.println(st.nextElement());
   
System.out.println("---- Split by comma ',' ------");
  StringTokenizer st2 = new StringTokenizer(str, ",");

  while (st2.hasMoreElements()) {
   System.out.println(st2.nextElement());

For example, if your file (test.txt) contain the content like
1| 3.29| mkyong
2| 4.345| eclipse

String line;
br = new BufferedReader(new FileReader("c:/test.txt"));
while ((line = br.readLine()) != null) 
{
 System.out.println(line);
 StringTokenizer stringTokenizer = new StringTokenizer(line, "|");
 while (stringTokenizer.hasMoreElements()) 
 {
  Integer id = Integer.parseInt(stringTokenizer.nextElement().toString());
     Double price = Double.parseDouble(stringTokenizer.nextElement().toString());
     String username = stringTokenizer.nextElement().toString();
     
  StringBuilder sb = new StringBuilder();
  sb.append("\nId : " + id);
  sb.append("\nPrice : " + price);
  sb.append("\nUsername : " + username);
  sb.append("\n*******************\n");

  System.out.println(sb.toString());
   }
}

Output:
1| 3.29| mkyong

Id : 1
Price : 3.29
Username :  mkyong
*******************

2| 4.345| eclipse

Id : 2
Price : 4.345
Username :  eclipse
*******************