显示数字格式化以万、亿为单位转换

原创

qq5d510d208e604 2022-06-06 12:17:33 博主文章分类：Java从入门到跑路 ©著作权

文章标签 ide 文章分类 运维

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public static StringBuffer formatNum(String num, Boolean b) {  
        StringBuffer sb = new StringBuffer();  
        BigDecimal b0 = new BigDecimal("100");  
        BigDecimal b1 = new BigDecimal("10000");  
        BigDecimal b2 = new BigDecimal("100000000");  
        BigDecimal b3 = new BigDecimal(num);  

        String formatNumStr = "";  
        String unit = "";  

        // 以百为单位处理  
        if (b) {  
            if (b3.compareTo(b0) == 0 || b3.compareTo(b0) == 1) {  
                return sb.append("99+");  
            }  
            return sb.append(num);  
        }  

        // 以万为单位处理  
        if (b3.compareTo(b1) == -1) {  
            formatNumStr = b3.toString();  
        } else if ((b3.compareTo(b1) == 0 && b3.compareTo(b1) == 1)  
                || b3.compareTo(b2) == -1) {
            unit = "万";  

            formatNumStr = b3.divide(b1).toString();  
        } else if (b3.compareTo(b2) == 0 || b3.compareTo(b2) == 1) {  
            unit = "亿";
            formatNumStr = b3.divide(b2).toString();  

        }  
        if (!"".equals(formatNumStr)) {  
            int i = formatNumStr.indexOf(".");  
            if (i == -1) {  
                sb.append(formatNumStr).append(unit);  
            } else {  
                i = i + 1;  
                String v = formatNumStr.substring(i, i + 1);  
                if (!v.equals("0")) {  
                    sb.append(formatNumStr.substring(0, i + 1)).append(unit);  
                } else {  
                    sb.append(formatNumStr.substring(0, i - 1)).append(unit);  
                }  
            }  
        }  
        if (sb.length() == 0)  
            return sb.append("0");  
        return sb;
    }

测试

System.out.println(formatNum("9",false));
        System.out.println(formatNum("109",false));
        System.out.println(formatNum("109",true));
        System.out.println(formatNum("10000",false));
        System.out.println(formatNum("10001",false));
        System.out.println(formatNum("2000000",false));
        System.out.println(formatNum("2001111",false));

输出结果