utility.java

来自「一个j2me手机游戏的简单引擎」· Java 代码 · 共 44 行

package isoj2me;

import java.util.*;
import javax.microedition.lcdui.*;

/**
 * <p>isoj2me: Utility</p>
 * <p>This class contains utility methods.</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>License: Lesser GPL (http://www.gnu.org)</p>
 * <p>Company: <a href=http://www.mondonerd.com target="_blank">Mondonerd.com</a></p>
 * @author Massimo Maria Avvisati
 * @version alpha 0.4
 */

public class Utility {
  public Utility() {
  }

  /**
   * This method return an Image loading it from the "hard disk" of the mobile phone (from the standard directory) or, if the image was already loaded, it return an image took from an hashtable
   * @param imageCode alphanumeric code for this image (filename)
   * @param imagesHash where to store Image objects
   * @return the requested Image
   */

  public static Image loadImage(String imageCode, Hashtable imagesHash) {
    if (imagesHash.containsKey(imageCode)) {
      return (Image) imagesHash.get(imageCode);
    }
    else {
      try {
	Image temp_image = Image.createImage("/" + imageCode + ".png");
	imagesHash.put(imageCode, temp_image);
	return (Image) imagesHash.get(imageCode);
      }
      catch (Exception ex) {
	System.out.println("loadImage Error can't load " + imageCode + ":" + ex);
      }
    }
    return null;
  }

}