除法计算：保留小数点几位

package service;

import org.junit.Test;
import java.text.NumberFormat;

/**
 * 除法计算：保留小数点几位
 *
 * @author zhangkuankuan
 * @version Id: NumberFormatTest.java, v 0.1 2022/7/19 17:01 zhangkuankuan Exp $$
 */
public class NumberFormatTest {

    @Test
    public void test2() {
        long successTotal = 12345;
        long total = 22923;
        NumberFormat numberFormat = NumberFormat.getInstance();
        // 设置精确到小数点后2位
//        numberFormat.setMaximumFractionDigits(2);
        // 设置精确到小数点后4位
        numberFormat.setMaximumFractionDigits(4);
        String successRate = numberFormat.format((float) successTotal / (float) total);
        System.out.println(successRate);
        System.out.println(successTotal + total);
    }

    public static void main(String[] args) {
        NumberFormatTest test = new NumberFormatTest();
        test.test2();
    }

}