updateProgress(double，double)在任务中具有受保护的访问权限

Question

我已经实现了自己的javafx.concurrent.Task，我想在类声明之外调用它的updateProgress方法，但是错误显示：updateProgress(double，double)在任务中具有受保护的访问权限

downloadTask.updateProgress(index,size);

Answer 1

Javadoc：https://docs.oracle.com/javafx/2/api/javafx/concurrent/task.html

Javadoc中的代码片段：

 public class IteratingTask extends Task<Integer> {
         private final int totalIterations;

         public IteratingTask(int totalIterations) {
             this.totalIterations = totalIterations;
         }

         @Override protected Integer call() throws Exception {
             int iterations = 0;
             for (iterations = 0; iterations < totalIterations; iterations++) {
                 if (isCancelled()) {
                     updateMessage("Cancelled");
                     break;
                 }
                 updateMessage("Iteration " + iterations);
                 updateProgress(iterations, totalIterations);
             }
             return iterations;
         }
     }