涓.綆鍗曡璇唈ava鑼冨瀷
緇忓父鍚漢璇?#8220;鑼冨瀷”錛屾垜涓鐩翠笉鏄お鏄庣櫧浠涔堝彨“鑼冨瀷”錛屼粖澶╁氨鏌ラ槄浜?jiǎn)涓浜涙枃绔狅紝緇欐垜鐨勭涓鎰熻灝辨槸涔嬫墍浠ュ湪java涓敤鑼冨瀷錛屽氨鏄負(fù)浜?jiǎn)璁╀竴浜涢敊璇湪緙栬瘧闃舵灝卞彲浠ユ毚闇插嚭鏉ワ紝鑰屼笉鐢ㄥ湪榪愯闃舵鎵嶆姏鍑哄紓甯搞備笅闈㈢粰鍑轟竴涓畝鍗曚緥瀛愭潵璇存槑銆?/p>
/** *//**
* 娌℃湁鍒╃敤鑼冨瀷鐨勪緥瀛?br>
*/ public void example1()...{ ArrayList array=new ArrayList(); array.add("this is a string"); array.add(new Integer(3));//榪欓噷鍙互姝ｇ‘娣誨姞 Iterator iterator=array.iterator();
while(iterator.hasNext())...{ String str=(String)iterator.next();//緙栬瘧鏃舵病閿欙紝浣嗗湪榪愯鏃朵細(xì)鎶涘嚭ClassCastException寮傚父 System.out.println(str);
} } public void example2()...{ ArrayList<String> array=new ArrayList<String>(); array.add("this is a string"); //array.add(new Integer(3));//緙栬瘧鏃朵細(xì)鎶ュ紓甯革細(xì)The method add(String) in the type ArrayList<String> is not applicable for the arguments(Integer) Iterator<String> iterator=array.iterator(); while(iterator.hasNext())...{ String str=iterator.next();//榪欓噷灝變笉闇瑕佽繘琛屽己鍒剁被鍨嬭漿鎹?/span> System.out.println(str); } }榪欐牱錛屾垜浠湪緙栬瘧闃舵灝卞彲浠ユ崟鑾峰彲鑳藉瓨鍦ㄥ湴鍗遍櫓銆?/p>
閫氳繃浠ヤ笂綆鍗曚緥瀛愶紝鎴戜滑鍙互鐪嬪嚭錛屼嬌鐢╦ava鑼冨瀷鐨勫ソ澶勬湁錛?/p>
- 鍐呭湪鐨勭被鍨嬭漿鎹紭浜庡湪澶栭儴鐨勪漢宸ヨ漿鎹?
- 綾誨瀷鐨勫尮閰嶉棶棰樺湪緙栬瘧闃舵灝卞彲浠ュ彂鐜幫紝鑰屼笉鐢ㄥ湪榪愯闃舵
浜?鍒涘緩鑷繁鐨勮寖鍨?/strong>
浠諱綍綾伙紝鎺ュ彛錛屽紓甯革紝鏂規(guī)硶閮藉彲浠ヤ嬌鐢ㄨ寖鍨嬶紝涓嬮潰鏄釜綆鍗曠殑渚嬪瓙錛屼嬌鐢ㄨ寖鍨嬫潵姣旇緝涓や釜瀵硅薄鐨勫ぇ灝忥紝涓や釜瀵硅薄蹇呴』閮藉疄鐜頒簡(jiǎn)Comparable鎺ュ彛銆?/font>
public <T extends Comparable> T max(T t1, T t2) ...{ if(t1.compareTo(t2) <= 0) ...{ return t2; } else ...{ return t1; } }]]>
jar cvf 瑕佷繚瀛樼殑鍚嶅瓧 璺緞
渚嬪 jar cvf upload.jar D:\project\hospital\web\WEB-INF\lib\a\upload
]]>
import java.security.*;
import java.security.spec.*;
public class MD5{
public static String getMD5(String s){
char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
try
{
byte[] strTemp = s.getBytes();
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(strTemp);
byte[] md = mdTemp.digest();
int j = md.length;
char str[] = new char[j*2];
int k = 0;
for (int i = 0; i < j; i++)
{
byte byte0 = md[i];
str[k++] = hexDigits[byte0 >>> 4 & 0xf];
str[k++] = hexDigits[byte0 & 0xf];
}
return new String(str);
}
catch (Exception e)
{
return null;
}
}
public static void main(String[] args)
{
System.out.print(MD5.getMD5("寮犱笁"));
}
}
]]>
棣栧厛System.currentTimeMillis()浜х敓涓涓綋鍓嶇殑姣錛岃繖涓縐掑叾瀹炲氨鏄嚜1970騫?鏈?鏃?鏃惰搗鐨勬縐掓暟錛孌ate()鍏跺疄灝辨槸鐩稿綋浜嶥ate(System.currentTimeMillis());鍥犱負(fù)Date綾昏繕鏈夋瀯閫燚ate(long date)錛岀敤鏉ヨ綆條ong縐掍笌1970騫?鏈?鏃ヤ箣闂寸殑姣宸?br> 寰楀埌浜?jiǎn)杩欎釜姣U掓暟錛屾垜浠嚜宸變篃鍙互綆楄搗鐜板湪鐨勫勾鏈堟棩鍛ㄦ椂錛屼絾鏄繖涓嶆槸鎴戜滑鍘昏綆楃殑錛屽洜涓烘湁Calendar銆侰alendar鏈緇堝嚭鐨勭粨鏋滃氨鏄勾鏈堟棩鍛ㄦ椂鏃跺尯銆?/p>
涔熷彲浠ョ敤榪欎釜鏉ュ仛涓婁紶鏂囦歡鐨勫悕縐幫紙閭ｅ氨涓嶅彲鑳芥湁閲嶅鍊間簡(jiǎn)鍝︼級(jí)
]]>