在Java中，如何将方法的输出返回到主方法中？

调用函数时需要使用括号

//RETURN TO MAIN METHOD
              double PctCompletion, AvgYardsGain, PctTouchdown, PctInterceptions;

              totalPoints = PctCompletion +  AvgYardsGain + PctTouchdown + PctInterceptions;

              total = (totalPoints / 6) * 100;

应更正为

totalPoints = PctCompletion +  AvgYardsGain + PctTouchdown + PctInterceptions;

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您应该将返回值赋给变量，然后使用这些变量。
请参阅以下代码：

totalPoints = PctCompletion() +  AvgYardsGain() + PctTouchdown() + PctInterceptions();

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您没有告诉我们您收到的错误消息。如果没有这些，就很难帮助您。您会遇到什么错误？

Assignment51.java:50:error:找不到符号totalPoints=awardPoints1+awardPoints2+awardPoints3+awardPoints4；^symbol:variable awardpoints 1位置：class Assignment51

我在您的代码文档中发现了一些东西。在每个方法之前，写“//调用xxx方法”。也许这有点挑剔，但实际上你并没有在那里调用这个方法。你实施它。在您的例子中，方法的调用发生在main方法中。

totalPoints = PctCompletion() +  AvgYardsGain() + PctTouchdown() + PctInterceptions();

    // Creating Methods

    double PctCompletion = PctCompletion();
    double AvgYardsGain = AvgYardsGain();
    double PctTouchdown = PctTouchdown();
    double PctInterceptions = PctInterceptions();

    // RETURN TO MAIN METHOD

    totalPoints = PctCompletion + AvgYardsGain + PctTouchdown + PctInterceptions;

    total = (totalPoints / 6) * 100;