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 called

public 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;    }}