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public static void reduceImg(String imgsrc, int widthdist, int heightdist) {
  try {
   File srcfile = new File(imgsrc);
   if (!srcfile.exists()) {
    return;
   }
   // ÔØÈëͼƬÎļþ
   Image src = javax.imageio.ImageIO.read(srcfile);
   int w0 = src.getWidth(null); // µÃµ½Ô´Í¼¿í
   int h0 = src.getHeight(null); // µÃµ½Ô´Í¼³¤
   BufferedImage tag = new BufferedImage((int) widthdist,
     (int) heightdist, BufferedImage.TYPE_INT_RGB);
   // ±£´æÎļþ
   // »æÖÆËõСºóµÄͼ
   tag.getGraphics().drawImage(
     src.getScaledInstance(widthdist, heightdist,
       java.awt.Image.SCALE_SMOOTH), 0, 0, null);
   // tag.getGraphics().drawImage(src.getScaledInstance(widthdist,
   // heightdist, Image.SCALE_AREA_AVERAGING), 0, 0, null);
   // ±êעˮӡ
   // int x = widthdist/10*8; //ˮӡλÖÃ(x,y)
   // int y = heightdist/10*8;
   // jpg_logo( tag , x , y );
   // ÖØÃüÃû²¢Ð½¨Í¼Æ¬
   String oleName = imgsrc.substring(imgsrc.lastIndexOf(".") - 1,
     imgsrc.lastIndexOf("."));
   String newName = oleName + "v";
   String imgdist = imgsrc.replace(oleName, newName);
   // Êä³öµ½ÎļþÁ÷
   FileOutputStream out = new FileOutputStream(imgdist);
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
   // ½üJPEG±àÂë
   encoder.encode(tag);
   out.close();
  } catch (IOException ex) {
   ex.printStackTrace();
  }
 }
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Àý 1.1.
public class HelloWorldApp { //an application
public static void main (String args[ ]){
System.out.println("Hello World!");
}
}
± ......

javaÕýÔò±í´ïʽ

   ÔÚʹÓÃRegularExpressionValidatorÑéÖ¤¿Ø¼þʱµÄÑéÖ¤¹¦Äܼ°ÆäÑéÖ¤±í´ïʽ½éÉÜÈçÏÂ:
Ö»ÄÜÊäÈëÊý×Ö£º“^[0-9]*$”
Ö»ÄÜÊäÈënλµÄÊý×Ö£º“^d{n}$”
Ö»ÄÜÊäÈëÖÁÉÙnλÊý×Ö£º“^d{n,}$”
Ö»ÄÜÊäÈëm-nλµÄÊý×Ö£º“^d{m,n}$”
Ö»ÄÜÊäÈëÁãºÍ·ÇÁ㿪ͷµÄÊý×Ö£º“^(0|[1- ......

JavaÕýÔòÑéÖ¤

import java.util.regex.*;

public final class RegExpValidator
{
/**
* ÑéÖ¤ÓÊÏä
* @param ´ýÑéÖ¤µÄ×Ö·û´®
* @return Èç¹ûÊÇ·ûºÏµÄ×Ö·û´®,·µ»Ø <b>true </b>,·ñÔòΪ <b>false </b>
*/
public static boolean isEmail(String str)
{ ......

Effective Java ѧϰ±Ê¼Ç£¨2£©

 ÓÐʱ£¬ÎÒÃÇÔÚдһ¸ö¹¹Ô캯Êýʱ£¬¾­³£ÒòΪËü°üº¬ÖÚ¶àµÄ²ÎÊý¶ø¿àÄÕ,Õâʱ¿ÉÒÔ¿¼ÂÇÓÃBuilderģʽÀ´´´½¨¶ÔÏó¡£
È磬ÎÒÃÇÒªÉè¼ÆÒ»¸öÓªÑø³É·ÝµÄÀ࣬°üº¬ÄÜÁ¿£¬µ°°×ÖÊ£¬Ö¬·¾£¬¸Æ£¬Ìú£¬Ð¿£¬Î¬ÉúËØA, άÉúËØB1 ... µÈ£¬µ«ÔÚ¹¹ÔìµÄʱºò£¬²»Ò»¶¨Ã¿´Î¶¼ÐèÒªÕâЩ²ÎÊý£¬Èç¸Æ£¬Ìú£¬Ð¿ºÍάÉúËØµÈÊÇ¿ÉÑ¡µÄ£¬ÎªÁËÊÊÓ¦¶àÖÖ¿ÉÄܵĴîÅ䣬±È ......

javaÖÐÖØÐ´equals·½·¨

import java.util.Date;
class Dog{
 private String name;
 private Date birthday;
 
 
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public Date getBirthday() {
  return b ......
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