Java資料型別中String、Integer、int相互間的轉換
阿新 • • 發佈:2019-01-28
1.Integer轉換成int的方法 Integer i = new Integer(10); int k = i.intValue(); 即Integer.intValue(); 2.int轉換成Integer int i = 10; Integer it = new Integer(i); 3.String轉換成int的方法 String str = "10"; Integer it = new Interger(str); int i = it.intValue(); 即:int i = Integer.intValue(string); 4.int轉換成String int i = 10; (1)String s = String.valueOf(i); (2)String s = Ingeger.toString(i); (3)String s = "" + i; 5.String轉換成Integer String str = "10"; Integer it = Integer.valueOf(str); 6.Integer轉換成String Integer it = new Integer(10); String str = it.toString(); 7.String轉換成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); //獲取今天的日期字串 String today = java.text.DateFormat.getDateInstance().format(new java.util.Date()); //獲取今天的日期 new java.sql.Date(System.currentTimeMillis());