【学习版】资料包-java

BigDecimal常用方法
https://www.csdn.net/tags/NtzaggysMzU4ODMtYmxvZwO0O0OO0O0O.html

    @Test
    public void test2() {
        BigDecimal a = new BigDecimal("4.04930393290");
        //显示价格
        NumberFormat format = NumberFormat.getCurrencyInstance(Locale.CHINA);
        System.out.println("result:" + format.format(a));
        //显示百分比
        NumberFormat nf = NumberFormat.getPercentInstance();
        System.out.println("result:====" + nf.format(a));

    }

result:￥4.05
result:====405%

Math常用方法-解决大部分数学计算
https://blog.csdn.net/Walker_sis/article/details/115772408

常用的16个Java实用工具类
https://blog.csdn.net/m0_49496327/article/details/123549714