BigDecimal

import java.math.BigDecimal;
import java.math.RoundingMode;

public class BigDecimalTest {
    public static void main(String[] args) {
        String raw1 = "99.9454";
        String raw2 = "-10.0354";
        System.out.println(acc(raw1));
        System.out.println(acc(raw2));
    }

    public static String acc(String raw) {
        // 中间计算结果
        BigDecimal temp = new BigDecimal(raw);
        temp = temp.setScale(2, RoundingMode.HALF_UP);
        String str = temp.toString();
        char tail = str.charAt(str.length() - 1);
        // 正负取舍策略不同
        if (temp.compareTo(new BigDecimal(0)) < 0) {
            if (tail > '5') {
                tail = '5';
            } else {
                tail = '0';
                temp = temp.add(new BigDecimal("0.1"));
            }
        }
        if (temp.compareTo(new BigDecimal(0)) > 0) {
            if (tail < '5') {
                tail = '5';
            } else {
                tail = '0';
                temp = temp.add(new BigDecimal("0.1"));
            }
        }
        str = temp.toString();
        String head = str.substring(0, str.length() - 1);
        BigDecimal result = new BigDecimal(head + tail);
        return result.toString();
    }
}