計算公式時出現Java錯誤

-2

我在編寫一個簡單的程序。它符合，但是在進入所需的測量之後，它就會爆炸。它看起來可能是一個轉換錯誤，但所有的數字都是一個浮點數。計算公式時出現Java錯誤

任何人都可以幫忙嗎？

import javax.swing.JOptionPane; 
public class Test 
{ 
    public static void main(String[] args) 
    { 
     String lengthString, radiusString ; 

     radiusString = JOptionPane.showInputDialog(null, "Enter the radius of the cylinder. ", JOptionPane.QUESTION_MESSAGE); 
      float radius = Float.parseFloat(radiusString); 

     lengthString = JOptionPane.showInputDialog(null, "Enter the length of the cylinder. ", JOptionPane.QUESTION_MESSAGE); 
     float length = Float.parseFloat(lengthString); 


     float pi = 3.14f ; 
     float two = 2f; 
     float bottomArea = (radius * radius * pi); 
     float cylinderArea = (two * radius * pi * length) + (two + bottomArea) ; 
     float volume = (bottomArea * length); 



     JOptionPane.showMessageDialog(null, String.format("The length of the cylinder is %.02f \n", length + 
      "The radius of the cylinder is %.02f \n", radius + 
      "The area of the cylinder is %.02f \n", cylinderArea + 
     "The volume of the cylinder is %.02f \n", volume)); 
    } 

}

java.util.IllegalFormatConversionException: f != java.lang.String 
    at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302) 
    at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2806) 
    at java.util.Formatter$FormatSpecifier.print(Formatter.java:2753) 
    at java.util.Formatter.format(Formatter.java:2520) 
    at java.util.Formatter.format(Formatter.java:2455) 
    at java.lang.String.format(String.java:2940) 
    at Test.main(Test.java:37) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

來源

2016-09-06 BlueConch

選中此項：http://stackoverflow.com/help/mcve – cuihtlauac

'float two = 2f;'真的嗎？！ – glglgl

我沒有多少年像你自己編程。不好意思。 – BlueConch

在格式Stringf代表浮點值，但在format打電話給你的第一個參數是String：

length + "The radius of the cylinder is %.02f \n"

你應該格式化字符串，這樣，而不是：

String.format("The length of the cylinder is %.02f \n" + 
      "The radius of the cylinder is %.02f \n" + 
      "The area of the cylinder is %.02f \n" + 
      "The volume of the cylinder is %.02f \n", 
      length, radius, cylinderArea, volume)

來源

2016-09-06 07:43:00 fabian

謝謝你的工作。 – BlueConch

計算公式時出現Java錯誤

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