Java - double类型的数据保留两位小数

    public static void main(String[] args) {
        double d = 3.1856666;
        // double类型的数据保留两位小数
        System.out.println(new DecimalFormat("#.00").format(d));
        // 或
        System.out.println(String.format("%.2f", d));
    }

Connected to the target VM, address: '127.0.0.1:57442', transport: 'socket'
3.19
Disconnected from the target VM, address: '127.0.0.1:57442', transport: 'socket'
3.19