java.utilパッケージにはコレクションを表現するクラスが多数あります。配列では要素数が固定になりますから，不定数のオブジェクトを扱うときには便利に使えます。J2SE 5では，Genericsを導入してさらに使いやすく安全になります。 さらに，java.util ...

2.b. Write a Java class called Customer to store their name and date_of_birth. The date_of_birth format should be dd/mm/yyyy. Write methods to read customer data as ...

Most Java programmers have used the java.util.StringTokenizer class at some time or another. It is a handy class that basically tokenizes (breaks) the input string based on a separator, and supplies ...

Though Java already has a character type and char keyword to represent and manipulate characters, the language also requires a Character class for two reasons: Character c1 = new Character ('A'); ...