javaÖÐstringÓëÆäËûÀàÐÍÖ®¼äµÄ»¥Ïàת»»

1.½«Int,Float,Double,Longת»»ÎªString
String s = ""+i;
String s = String.valueOf(i);
String s = Integer.toString(i);
µÚÒ»ÖÖ·½·¨£ºs = ""+i;   //»á²úÉúÁ½¸öString¶ÔÏó
µÚ¶þÖÖ·½·¨£ºs=String.valueOf(i); //Ö±½ÓʹÓÃStringÀàµÄ¾²Ì¬·½·¨£¬Ö»²úÉúÒ»¸ö¶ÔÏó
µÚÈýÖÖ·½·¨£ºÐ§ÂÊ×î¸ß£¿
2.½«Stringת»»ÎªInt,Float,Double,Long
int i = Integer.parseInt(s);
int i = Integer.valueOf(s).intValue();
µÚÒ»ÖÖ·½·¨£ºi=Integer.parseInt(s);//Ö±½ÓʹÓþ²Ì¬·½·¨£¬²»»á²úÉú¶àÓàµÄ¶ÔÏ󣬵«»áÅ׳öÒì³£
µÚ¶þÖÖ·½·¨£ºi=Integer.valueOf(s).intValue();//Integer.valueOf(s) Ï൱ÓÚ new Integer(Integer.parseInt(s))£¬Ò²»áÅ×Òì³££¬µ«»á¶à²úÉúÒ»¸ö¶ÔÏó
3.½«Dateת»»ÎªString
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String s = format.format(date);
4.½«Stringת»»ÎªDate
DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date date = format.parse(s);
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public class TypeChange {
   public TypeChange() {
   }
   //change the string type to the int type
   public static   int stringToInt(String intstr)
   {
     Integer integer;
     integer = Integer.valueOf(intstr);
     return integer.intValue();
   }
   //change int type to the string type
   public static String intToString(int value)
   {
     Integer integer = new Integer(value);
     return integer.toString();
   }
   //change the string type to the float type
   public static   float stringToFloat(String floatstr)
   {
     Float floatee;
     floatee = Float.valueOf(floatstr);
     return floatee.floatValue();
   }
   //change the float type to the string type
   public