调用带有参数的方法到另一个方法

Question

我试图弄清楚如何，或者是否可以调用一个包含参数的方法。我想在 costForPaint 方法中使用 requiredPaint 方法。（代码已简化）：public class job {public static void main(String[] args) {    int rooms = 1;    double squareFeet = 0;    double totalSquareFeet = 115;    totalSquareFeet = squareFeet + totalSquareFeet;    }requiredPaint(totalSquareFeet);//i want to use the totalSquareFeet in this method, this is why it is calledpublic static double requiredPaint(double totalSquareFeet) {    double totalPaint = totalSquareFeet / 115;    return totalPaint;}public static double costForPaint() {    double paintCost = 2;    //shows error where required paint is    double totalPaintCost = requiredPaint() * paintCost;    return totalPaintCost;}

Answer 1

如果要在costPaint方法中使用requiredPaint方法，则需要强制向 requiredPaint 方法发送双参数。现在这完全取决于您将如何实现您的功能。

您可以将 double 类型的参数添加到您的 costForPaint 方法中，如下所示：

public static double costForPaint(double totalSquareFeet) {

    double paintCost = 2;

    //shows error where required paint is

    double totalPaintCost = requiredPaint(totalSquareFeet) * paintCost;

    return totalPaintCost;

}

Answer 2

你的代码应该像-

public static double costForPaint() {

     double paintCost = 2;

     double totalPaint = 15;//any number you want to initialize in totalPaint 

     double totalPaintCost = requiredPaint(totalPaint) * paintCost;

     return totalPaintCost;

}

您收到错误是因为 requiredPaint() 是一个参数化方法，并且您没有在其中提供任何参数。

Answer 3

1> 在 Java 中，如果您已经向方法声明了一个参数，则必须传递该参数（空值或某个值）。这是一个可以根据您的要求完成的流程。

2> 你也不能在类块中调用方法。所以我删除了requiredPaint(totalSquareFeet);

public class job {

    public static void main(String[] args) {

        int rooms = 1;

        double squareFeet = 0;

        double totalSquareFeet = 115;

        totalSquareFeet = squareFeet + totalSquareFeet;

        costForPaint(totalSquareFeet);

    }

    //i want to use the totalSquareFeet in this method, this is why it is called

    public static double requiredPaint(double totalSquareFeet) {

        double totalPaint = totalSquareFeet / 115;

        return totalPaint;

    }

    public static double costForPaint(double totalSquareFeet) {

        double paintCost = 2;

        //shows error where required paint is

        double totalPaintCost = requiredPaint(totalSquareFeet) * paintCost;

        return totalPaintCost;

    }

}