Java实现命令行的进度条

public class ProgressBar {
    private double finishPoint;
    private double barLength;
    
    public ProgressBar(){
        this.finishPoint = 100;
        this.barLength = 20;
    }
    
    public ProgressBar(double finishPoint, int barLength){
        this.finishPoint = finishPoint;
        this.barLength = barLength;
    }
    
    /**
     * 显示进度条
     * @param currentPoint 当前点
     * @param finishPoint 结束点
     * @param barLength 进度条长度(字符)
     * @return 进度条结果
     */
    public void showBarByPoint(double currentPoint) {
        // 根据进度参数计算进度比率
        double rate = currentPoint / this.finishPoint;
        // 根据进度条长度计算当前记号
        int barSign = (int) (rate * this.barLength);
        // 生成进度条
        System.out.print("\r");
        System.out.print(makeBarBySignAndLength(barSign) + String.format(" %.2f%%", rate * 100));
    }
    
    /**
     * 构造进度条
     * @param barSign 进度条标记(当前点)
     * @param barLength 进度条长度
     * @return 字符型进度条
     */
    private String makeBarBySignAndLength(int barSign) {
        StringBuilder bar = new StringBuilder();
        bar.append("[");
        for (int i=1; i<=this.barLength; i++) {
            if (i < barSign) {
                bar.append("-");
            } else if (i == barSign) {
                bar.append(">");
            } else {
                bar.append(" ");
            }
        }
        bar.append("]");
        return bar.toString();
    }
}