java简单的将小数四舍五入代码

package testNumber;


import org.junit.jupiter.api.Test;

import java.math.BigDecimal;
import java.text.DecimalFormat;

/**
 * @author: Xu Yinshan  @createTime: 2021/5/19 16:57
 * Description: 
 */
public class TestNumber {

    @Test
    public void testNumber1(){
        DecimalFormat df = new DecimalFormat("#0.00");
        String format = df.format(new BigDecimal("2.678"));
        System.out.println(format);
    }

    @Test
    public void testNumber2(){
        BigDecimal bigDecimal = new BigDecimal("2.678").setScale(2, BigDecimal.ROUND_HALF_UP);
        System.out.println(bigDecimal.toString());
    }
}