import java.util.Hashtable;
import java.util.Enumeration;
...
class myHash {
	void method() throws IOException {
		String		str, name;
		StringTokenizer	line;

		RandomAccessFile fp = new RandomAccessFile("/etc/passwd", "r");
		Hashtable hash	    = new Hashtable(5);

		while ((str = fp.readLine()) != null) {
			line = new StringTokenizer(str, ":");
			name = line.nextToken();
			hash.put(name, str);
		}

		System.out.println("Size : " + hash.size());

		Enumeration step = hash.elements();

		while (step.hasMoreElements()) {
			str = (String) step.nextElement();
			System.out.println(str);
		}

		str = (String) hash.get("chris");
		System.out.println();
		System.out.println(str);
	}
}