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1.дһ¸ö·½·¨£¬ÓÃÒ»¸öforÑ­»·´òÓ¡¾Å¾Å³Ë·¨±í
  /**
* ´òÓ¡¾Å¾Å³Ë·¨¿Ú¾÷±í
*/
public void nineNineMulitTable(){
for (int i = 1,j = 1; j <= 9; i++) {
System.out.print(i+"*"+j+"="+i*j+" ");
if(i==j){
i=0;
j++;
System.out.println();
}
}
}

2.¸ø¶¨Ò»¸öjava.util.Date¶ÔÏó£¬ÈçºÎת»¯Îª”2007-3-22 20:23:22”¸ñʽµÄ×Ö·û´®
/**
* ½«Ä³¸öÈÕÆÚÒԹ̶¨¸ñʽת»¯³É×Ö·û´®
* @param date
* @return str
*/
public String date2FormatStr(Date date)
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String str = sdf.format(date);
return str;
}
3.дһ¸ö·½·¨£¬Äܹ»ÅжÏÈÎÒâÒ»¸öÕûÊýÊÇ·ñËØÊý
/**
* ÅжÏÈÎÒâÒ»¸öÕûÊýÊÇ·ñËØÊý
* @param num
* @return boolean
*/
public boolean isPrimeNumber(int num)
{
for (int i = 2; i <= Math.sqrt(num); i++) {
if(num%i==0)
{
return false;
}
}
return true;
}

4.дһ¸ö·½·¨£¬ÊäÈëÈÎÒâÒ»¸öÕûÊý£¬·µ»ØËüµÄ½×³Ë

/**
*»ñµÃÈÎÒâÒ»¸öÕûÊýµÄ½×³Ë
*@param n
*@returnn!
*/
public int factorial(int num)
{
//µÝ¹é
if(num == 1)
{
return 1;
}
return num*factorial(num-1);
}
5.дһ¸ö·½·¨£¬Óöþ·Ö²éÕÒ·¨ÅжÏÈÎÒâÕûÊýÔÚÈÎÒâÕûÊýÊý×éÀïÃæÊÇ·ñ´æÔÚ£¬Èô´æÔھͷµ»ØËüÔÚÊý×éÖеÄË÷ÒýλÖ㬲»´æÔÚ·µ»Ø-1

/**
*¶þ·Ö²éÕÒÌØ¶¨ÕûÊýÔÚÕûÐÍÊý×éÖеÄλÖÃ(µÝ¹é)
*@param dataset
*@param data
*@param beginIndex
*@param endIndex
*@return index
*/
public int binarySearch(int[] dataset,int data,int beginIndex,int endIndex){
int midIndex = (beginIndex+endIndex)/2;
//Èç¹û²éÕÒµÄÊýÒª±È¿ªÊ¼Ë÷ÒýµÄÊý¾ÝҪС»òÕßÊDZȽ


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