Question

我需要添加十进制位置，我知道如何编写它。我修改了这段代码并尝试了不同的东西，这就是为什么我的其他陈述与if不同。

另外，我会通过GUI进行扫描。无论如何，当我选择if语句然后它在控制台中显示结果，然后转到else语句。我尝试了几件事，但无法弄清楚原因。

import java.text.DecimalFormat;

import javax.swing.*;

public class MathFormula {

    public static void main(String args[]) {

        //Declarations
        double getNumDouble;
        double volumeSphere;
        String getNum;
        double area;
        double volume;
        String getUserDecision; //Declared getUserDecision for outer loop decision
        DecimalFormat df = new DecimalFormat("####0.000");
        java.util.Scanner input = new java.util.Scanner(System.in);
        //End Declarations

        // Greeting
        greeting();

        System.out.println("  "); //Left blank for clarity

        // Ask user to start the program (the outer loop)

        getUserDecision = decisionOuter();
        while (getUserDecision.equalsIgnoreCase("Y")) {

            getUserDecision = decisionInner();

            if (getUserDecision.equalsIgnoreCase("S")) {

                System.out.print("Enter you number for volume of sphere: ");
                getNum = input.next();
                getNumDouble = Double.parseDouble(getNum);
                volSphere(getNumDouble);

            } else if (getUserDecision.equalsIgnoreCase("C"))
                System.out.println(" ");
            area = arCircle();
            System.out.println("you have worked: " + df.format(area));

            getUserDecision = decisionOuter();
        }

        goodbye();
    }

    public static String decisionOuter() //Outerloop decision
    {
        String userDecisionString;

        userDecisionString = JOptionPane.showInputDialog("Would you like to use the program Y/N: ");

        return userDecisionString;
    }

    public static String decisionInner() //Inner loop decision
    {
        String userDecisionString2;

        userDecisionString2 = JOptionPane.showInputDialog("C or S: ");

        return userDecisionString2;
    }

    public static void volSphere(double getNumDouble) //Vol formula
    {
        double volumeSphere;

        volumeSphere = (4 * Math.PI * getNumDouble * getNumDouble * getNumDouble) / 3;

        System.out.println("entered " + getNumDouble + "returned" + volumeSphere);
    }

    public static double arCircle() //area formula
    {
        double getNum;
        double areaCircle;
        String getNumString;

        getNumString = JOptionPane.showInputDialog("Enter you number for radius of circle: ");
        getNum = Double.parseDouble(getNumString);
        areaCircle = (getNum * getNum * Math.PI);
        return areaCircle;
    }

    public static void greeting() //greeting
    {
        final String msgGreet = "Welcome.";
        System.out.println(msgGreet);
    }

    public static void goodbye() //goodbye
    {
        final String msgBye = "goodbye.";
        System.out.println(msgBye);
    }
}

Answer 1

因为你还没有包含围绕其他内容的curley括号。它只考虑'System.out.println（“”）;'作为你的else语句，它下面的所有其他语句都被执行，如果你想要排除，那么在else条件中包含你想要的代码周围的curley括号

//...
}
else if (getUserDecision.equalsIgnoreCase("C"))
{
    System.out.println(" ");
    area = arCircle();
    System.out.println("you have worked: " + df.format(area));
}

getUserDecision = decisionOuter();
//...

为什么我的if语句会在结果显示之后转到其他地方？

1 个答案: