Question

我试图创建一个GPA计算器，但我遇到了一个问题。我正在尝试使用一个变量来存储不同的值。例如，我希望我的代码如下：

输入AP类的数量：

然后我希望用户也为每个类命名，如：

AP Class 1的名称 AP等级2的名称等等

我希望用户输入AP类的名称以及他们在该类中拥有的百分比。如何在不知道AP类数量的情况下完成此操作？

这是我的代码：

    System.out.print("Enter the number of classes you have: ");
    numOfClass = Keyboard.readInt();

    System.out.print("Enter the amount of AP Classes: ");
    numOfAP = Keyboard.readInt();

    if (numOfAP > 0)
    {
        do
        {
            System.out.print("Enter the name of AP Class " + (numOfAPNamed + 1) + ": ");
            nameAP = Keyboard.readString();

            System.out.print("Enter grade (in percentage) of AP Class " + (numOfAPNamed + 1) + ": ");
            gradeAP = Keyboard.readDouble();

            System.out.println();

            numOfAPNamed++;
        }while (numOfAPNamed != numOfAP);

    }


}

}

Answer 1

最简单的方法是使用数组。尝试这样的事情：

// declarations
String[] nameAP = null;
double[] gradeAP = null;

System.out.print("Enter the number of classes you have: ");
numOfClass = Keyboard.readInt();
System.out.print("Enter the amount of AP Classes: ");
numOfAP = Keyboard.readInt();
if (numOfAP > 0)
{
    // instantiation
    nameAP = new String[numOfAP];
    gradeAP = new double[numOfAP];

    // loop
    for (int numOfAPNamed = 0; numOfAPNamed < numOfAP; ++numOfAPNamed)
    {
        System.out.printf("Enter the name of AP Class %d: ", numOfAPNamed + 1);
        // input name, percentage
        nameAP[numOfAPNamed] = Keyboard.readString();
        System.out.printf("Enter grade (in percentage) of AP Class %d: ", numOfAPNamed + );
        gradeAP[numOfAPNamed] = Keyboard.readDouble();
        System.out.println();
    }

    // TODO process...
}

如果您事先无法知道尺寸，例如从文件中读取，则使用集合，例如List或Map。有关详细信息，请参阅Java Collection Framework文档...

可以将多个值存储到一个变量中吗？

1 个答案: