Java控制台进度条，批处理数据必备！

需求描述

写了好多批量处理数据的代码了，但是从一开始连日志都不知道打印，只知道干等着，到后来慢慢关注日志和性能。发现通过一条一条的日志来查看进度真是一个费力不讨好的事情。最近才想到用进度条来展示程序的进度，真是兜了一个大圈子😂，希望看到之后有收获的同学能顺手点个赞，谢谢！

import java.util.Arrays;

public class ConsoleProgressBar {

    public static void printBar(int total, int now) {
        // 参数校验
        check(total, now);
        // 计算百分比
        double percent = (double) now / total * 100;
        // 计算格数，默认100格
        int fillNum = (int) percent;
        // 生成进度条
        String bar = generateBar(fillNum);
        // 输出
        System.out.printf("\rProgress [%s] %.2f%%", bar, percent);
        if (fillNum == 100) System.out.print('\n');
    }

    public static void printBar(int total, int now, String elapse) {
        // 参数校验
        check(total, now);
        // 计算
        double percent = (double) now / total * 100;
        // 计算格数，默认100格
        int fillNum = (int) percent;
        // 生成进度条
        String bar = generateBar(fillNum);
        // 输出
        System.out.printf("\rProgress [%s] %.2f%% | elapse: %s", bar, percent, elapse);
        if (fillNum == 100) System.out.print('\n');
    }

    public static String generateBar(int total, int fillNum, char c) {
        char[] chars = new char[total];
        Arrays.fill(chars, 0, fillNum, c);
        Arrays.fill(chars, fillNum, total, ' ');
        return String.valueOf(chars);
    }

    private static String generateBar(int fillNum) {
        return generateBar(100, fillNum, '#');
    }

    private static void check(int total, int now) {
        if (total < now) throw new IllegalArgumentException("total can't smaller than now");
        if (total < 1) throw new IllegalArgumentException("total can't smaller than 1");
        if (now < 0) throw new IllegalArgumentException("now can't smaller than 0");
    }

}