基于控制台的Java进步 [英] Console based progress in Java

问题描述

有没有简单的方法来实现Java中的进程的滚动百分比，以显示在控制台中？我有一个百分比数据类型（双）我在一个特定的过程中生成，但我可以强制它到控制台窗口并刷新，而不是只打印一个新行的每个新的更新的百分比？我正在考虑推送cls和更新，因为我在Windows环境中工作，但我希望Java有一些内置的能力。欢迎所有建议！谢谢！

Is there are easy way to implement a rolling percentage for a process in Java, to be displayed in the console? I have a percentage data type (double) I generated during a particular process, but can I force it to the console window and have it refresh, instead of just printing a new line for each new update to the percentage? I was thinking about pushing a cls and updating, because I'm working in a Windows environment, but I was hoping Java had some sort of built-in capability. All suggestions welcomed! Thanks!

推荐答案

您可以打印回车 \r

示例：

public class ProgressDemo {
  static void updateProgress(double progressPercentage) {
    final int width = 50; // progress bar width in chars

    System.out.print("\r[");
    int i = 0;
    for (; i <= (int)(progressPercentage*width); i++) {
      System.out.print(".");
    }
    for (; i < width; i++) {
      System.out.print(" ");
    }
    System.out.print("]");
  }

  public static void main(String[] args) {
    try {
      for (double progressPercentage = 0.0; progressPercentage < 1.0; progressPercentage += 0.01) {
        updateProgress(progressPercentage);
        Thread.sleep(20);
      }
    } catch (InterruptedException e) {}
  }
}

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