1.Integer转换成int的方法
Integer i;
int k = i.intValue();
即Integer.intValue();
2.int转换成Integer
int i;
Integer it = new Integer(i);
3.String转换成int的方法
String str = "10";
Integer it = new Interger(str);
int i = it.intValue();
即：int i = Integer.intValue(string);
4.int转换成String
int i;
(1)String s = String.valueOf(i);
(2)String s = Ingeger.toString(i);
(3)String s = "" + i;
5.String转换成Integer
String str = "10"
Integer it = Integer.valueOf(str);
6.Integer转换成String
Integer it;
String str = it.toString();
7.String转换成BigDecimal
BigDecimal bd = new BigDecimal(str);
8.日期
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH)+1;
int day = calendar.get(Calendar.DATE);
//获取今天的日期字符串
String today = java.text.DateFormat.getDateInstance().format(new java.util.Date());
//获取今天的日期
new java.sql.Date(System.currentTimeMillis());