Java数据类型中String、Integer、int相互间的转换

1.Integer转换成int的方法Integer i = new Integer(10); 
int k = i.intValue();
即Integer.intValue(); 2.int转换成Integerint i = 10;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Stringint i = 10;(1)String s = String.valueOf(i);(2)String s = Ingeger.toString(i);(3)String s = "" + i; 5.String转换成IntegerString str = "10";Integer it = Integer.valueOf(str); 6.Integer转换成StringInteger it = new Integer(10);String str = it.toString(); 7.String转换成BigDecimalBigDecimal 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());