phonebookentrycomparator.java

Enjoy Web Dev With Tapestry 一书的源代码

package com.ttdev.phonebook;

import java.util.*;

public class PhoneBookEntryComparator implements Comparator {
	private String columnName;

	public PhoneBookEntryComparator(String columnName) {
		this.columnName = columnName;
	}
	public int compare(Object obj1, Object obj2) {
		PhoneBookEntry entry1 = (PhoneBookEntry) obj1;
		PhoneBookEntry entry2 = (PhoneBookEntry) obj2;
		if (columnName.equals("id")) {
			return entry1.getId()-entry2.getId();
		} else 	if (columnName.equals("firstName")) {
			return entry1.getFirstName().compareTo(entry2.getFirstName());
		} else {
			//Similar for other columns.
			return 0;
		}
	}
}