orderedproperties.java

在Myeclipse中设置常量的例子,这样可以使大家不用每次都去声明一次.可以很好的优化和解决大家的烦恼.

package utils;

/*
 *author hpq
 *2008-9-2
 */
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

public class OrderedProperties extends java.util.Properties {

	ArrayList orderedKeys = new ArrayList();

	public OrderedProperties() {

		super();

	}

	public OrderedProperties(java.util.Properties defaults) {

		super(defaults);

	}

	public synchronized Iterator getKeysIterator() {

		return orderedKeys.iterator();

	}

	public static OrderedProperties load(String name)

	throws IOException {

		OrderedProperties props = null;

		java.io.InputStream is =

		OrderedProperties.class.getResourceAsStream(name);

		if (is != null) {

			props = new OrderedProperties();

			props.load(is);

			return props;

		} else {

			if (!name.startsWith("/")) {

				return load("/" + name);

			} else {

				throw new IOException("Properties could not be loaded.");

			}

		}

	}

	public synchronized Object put(Object key, Object value) {

		Object obj = super.put(key, value);

		orderedKeys.add(key);

		return obj;

	}

	public synchronized Object remove(Object key) {

		Object obj = super.remove(key);

		orderedKeys.remove(key);

		return obj;

	}

}