Owl Teach Yourself Java 2 in 21 Days Professional Reference Edition, Second Edition
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ROGERS CADENHEAD

Day 4: Working with Objects

Notes and Corrections

  • None.

Source Files

Reader Questions

  • Question: I solved the first exercise using the StringTokenizer class, calling my files Uebungtag4.java and Uebungtag4.class. Why didn't you use that class?
    Answer: I used the substring() method to solve this exercise because the date format is in a fixed format -- "MM/DD/YYYY". Because it is fixed, I can count on the month, day, and year always occupying the same portions of a string. The month is in positions 1 and 2, the day in 4 and 5, and so on.
         Your StringTokenizer solution is more flexible, because it can handle dates that aren't as fixed. For example, it works with "7/6/1964" and "07/06/1964."

Activities

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