常规小操作的代码:
import java.math.BigDecimal; import java.sql.Timestamp; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.Iterator; public class TestCommon { private static SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); public static void main(String[] args) { System.out.println("===时间操作==="); long times= 1471253315716l ; Timestamp ts =new Timestamp(times); System.out.println(df.format(ts)); Calendar calendar = Calendar.getInstance(); calendar.setTime(new Date()); calendar.set(Calendar.DAY_OF_MONTH, calendar.get(Calendar.DAY_OF_MONTH)-30); System.out.println("---"+df.format(calendar.getTime())); System.out.println("===运算操作==="); BigDecimal big1 = new BigDecimal(654); BigDecimal big2 = new BigDecimal("354.254788"); //big1.compareTo(big2) = 0 System.out.println((big1.add(big2)).setScale(2,BigDecimal.ROUND_HALF_UP)); System.out.println(big1.divide(new BigDecimal(2), 2,BigDecimal.ROUND_HALF_UP)); System.out.println("===迭代操作==="); Iterable<BigDecimal> values= new ArrayList<>(); BigDecimal sum = new BigDecimal(0); for (Iterator iter = values.iterator(); iter.hasNext();) { BigDecimal val = (BigDecimal)iter.next(); sum = sum.add(val); } } }
时间: 2024-10-06 05:34:52