Java 版本终端进度条实现。

Untitled.java

import java.util.concurrent.*;
import java.util.*;

public class Untitled {
    public static void main(String[] args) {
        long total = 235;
        long startTime = System.currentTimeMillis();

        for (int i = 1; i <= total; i = i + 3) {
            try {
                Thread.sleep(50);
                printProgress(startTime, total, i);
            } catch (InterruptedException e) {
            }
        }
    }


    private static void printProgress(long startTime, long total, long current) {
        long eta = current == 0 ? 0 : 
            (total - current) * (System.currentTimeMillis() - startTime) / current;

        String etaHms = current == 0 ? "N/A" : 
                String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(eta),
                        TimeUnit.MILLISECONDS.toMinutes(eta) % TimeUnit.HOURS.toMinutes(1),
                        TimeUnit.MILLISECONDS.toSeconds(eta) % TimeUnit.MINUTES.toSeconds(1));

        StringBuilder string = new StringBuilder(140);   
        int percent = (int) (current * 100 / total);
        string
            .append('\r')
            .append(String.join("", Collections.nCopies(percent == 0 ? 2 : 2 - (int) (Math.log10(percent)), " ")))
            .append(String.format(" %d%% [", percent))
            .append(String.join("", Collections.nCopies(percent, "=")))
            .append('>')
            .append(String.join("", Collections.nCopies(100 - percent, " ")))
            .append(']')
            .append(String.join("", Collections.nCopies((int) (Math.log10(total)) - (int) (Math.log10(current)), " ")))
            .append(String.format(" %d/%d, ETA: %s", current, total, etaHms));

        System.out.print(string);
    }
}