java date
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java.Text.SimpleDateFormat format = new java.Text.SimpleDateFormat("yyyy-MM-dd hh:mm:ss");//ÄãÏëÒªµÄ¸ñʽ
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format.format(new java.util.Date());//dateΪÈÕÆÚÐÍÊý¾Ý£¬¿ÉÒÔÈÎÒâʱ¼ä
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Character Classes
[abc] Simple character class
[a-zA-Z]   ......
import java.util.Arrays;
/**
* ÇóÒ»¸öÊý×éµÄÈ«ÅÅÁÐËã·¨
* @author Administrator
*/
public class Pai {
public void pai(char[] array,int start,int end){
System.out.println(" -- ×éºÏ "+start+" µ½ "+end+" --");
if(start==end){
  ......
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String : ×Ö·û´®ÀàÐÍ
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String(StringBuffer buffer)£ºÍ¨¹ýStringBufferÊý×é¹¹Ôì×Ö·û´®¶ÔÏó¡£
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byte[] b = ......
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