Question

好的，所以我一直在研究一个带有类的计算器（要使用类而不是函数），当我运行它时，无论我输入什么或者说要用于运算符，我都会返回零。这是我的代码：

主要课程：

    import java.util.Scanner;
  //numof = number of numbers in array
  // numarrays = the array for user input
 // finial = finial number aka the answer

public class Calculator {
public static double finial;    
/**
 * @return the finial
 */
public static double getFinial() {
    return finial;
}



/**
 * @param numof the finial to set
 */
public static void setFinial(double finial) {
    finial = numof;
}

public static int numof;    
/**
 * @return the numof
 */
public static int getNumof() {
    return numof;
}



/**
 * @param numof the numof to set
 */
public static void setNumof(int numof) {
    numof = numof;
}


public static double[] numarrays;
/**
 * @return the numarrays
 */
public static double[] getNumarrays() {
    return numarrays;
}



/**
 * @param numarrays the numarrays to set
 */
public static void setNumarrays(double[] numarrays) {
    numarrays = numarrays;
}







@SuppressWarnings("resource")
public static void main (String[] args) {
    System.out.println("Hello and welcome to my calculator, in this calculator you can add, subtract or multiply");
    System.out.println("For the next step I need to know how many numbers you would like to input? ");


    int numof;  
    Scanner numofnums= new Scanner(System.in);
    numof = numofnums.nextInt();
    Calculator.setNumof(numof);



    System.out.println("So next you are going to input the numbers");


    double[] numarrays = new double[numof];
    for (int k=0; k < numof; k++){
        System.out.println("Please enter number");
        Scanner input = new Scanner(System.in);
        numarrays[k] = input.nextDouble();

    }
    Calculator.setNumarrays(numarrays);

    System.out.println("Please enter what you would like to do with these numbers add,subtract,avg,multiply");
    Scanner OP = new Scanner(System.in);
    String OPerator= OP.next();
    if (OPerator.equals ("add")){
        Add.adding();


    }
    else if (OPerator.equals ("subtract")){
        subtract.subtracting();


    }
    else if (OPerator.equals ("multiply")){
        multiply.multiplying();

    }
    else if (OPerator.equals ("avg")){
        avg.avging();

        }
        System.out.println("The answer is " + Calculator.getFinial());





}
}

这是添加类：

    public class  Add extends Calculator {

public static void adding() {
    double finial = 0;


for (int h = 0; h < Calculator.getNumof(); h++){
    finial  = finial + Calculator.getNumarrays()[h];


}
Calculator.setFinial(finial);
}
}

我还有三个课程，但只是操作员课程，如果你需要它，请告诉我

Answer 1

快速浏览一下显示一些重要的基本问题。例如，在基本的设置器中，例如：

public static void setFinial(double finial) {
    finial = numof;
}

来自您的代码，您最有可能的是

public static void setFinial(double paramFinial) {
    finial = paramFinial;
}

如果静态变量和参数具有相同的名称，则无法同时访问它们。编译器会认为你在谈论参数。另外，请注意你的setter使用参数paramFinial而不是numof可能无意的引用。

如果您要评论finial，numof和其他变量所代表的内容，那么阅读其余代码将会容易得多。

带有类的Java计算器

1 个答案: