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java - 单位转换器...不断返回 0

转载 作者:行者123 更新时间:2023-11-30 04:05:35 25 4
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我正在尝试在单位之间进行转换。每当我运行测试仪并输入输入时,输出始终为 0。例如,如果我要求从英寸转换为英尺,并且输入 12 英寸,则输出为 0.0 英尺。

这是我的类(class)(抱歉,它太长了;很多都是重复的)

public class UnitConverter
private String convertTo;
private String convertFrom;
private double value;
private double convertedResult;

//inches
final double INCHES_PER_INCH = 1;
final double FEET_PER_INCH = (1/12);
final double MILES_PER_INCH = 0.0000158;
final double MILLIMETERS_PER_INCH = 25.4;
final double CENTIMETERS_PER_INCH = 2.54;
final double METERS_PER_INCH = 0.0254;
final double KILOMETERS_PER_INCH = 0.0000254;

//feet
final double INCHES_PER_FOOT = 12;
final double FEET_PER_FOOT = 1;
final double MILES_PER_FOOT = 0.0001894;
final double MILLIMETERS_PER_FOOT = 304.80060996;
final double CENTIMETERS_PER_FOOT = 30.48;
final double METERS_PER_FOOT = 0.3048;
final double KILOMETERS_PER_FOOT = 0.0003048;

//miles
final double INCHES_PER_MILE = 63360;
final double FEET_PER_MILE = 5280;
final double MILES_PER_MILE = 1;
final double MILLIMETERS_PER_MILE = 1609344;
final double CENTIMETERS_PER_MILE = 160934.4;
final double METERS_PER_MILE = 1609.344;
final double KILOMETERS_PER_MILE = 1.609344;

//millimeters
final double INCHES_PER_MILLIMETER = 0.0393701;
final double FEET_PER_MILLIMETER = 0.0032808;
final double MILES_PER_MILLIMETER = 0.0000006;
final double MILLIMETERS_PER_MILLIMETER = 1;
final double CENTIMETERS_PER_MILLIMETER = 0.1;
final double METERS_PER_MILLIMETER = 0.001;
final double KILOMETERS_PER_MILLIMETER = 0.0000001;

//centimeters
final double INCHES_PER_CENTIMETER = 0.393701;
final double FEET_PER_CENTIMETER = 0.032808;
final double MILES_PER_CENTIMETER = 0.000006;
final double MILLIMETERS_PER_CENTIMETER = 10;
final double CENTIMETERS_PER_CENTIMETER = 1;
final double METERS_PER_CENTIMETER = 0.01;
final double KILOMETERS_PER_CENTIMETER = 0.000001;

// meters
final double INCHES_PER_METER = 39.37;
final double FEET_PER_METER = 3.281;
final double MILES_PER_METER = 0.0006214;
final double MILLIMETERS_PER_METER = 1000;
final double CENTIMETERS_PER_METER = 100;
final double METERS_PER_METER = 1;
final double KILOMETERS_PER_METER = 0.001;

//kilometers
final double INCHES_PER_KILOMETER = 39370;
final double FEET_PER_KILOMETER = 3280.83333;
final double MILES_PER_KILOMETER = 0.6214;
final double MILLIMETERS_PER_KILOMETER = 1000000;
final double CENTIMETERS_PER_KILOMETER = 100000;
final double METERS_PER_KILOMETER = 1000;
final double KILOMETERS_PER_KILOMETER = 1;
/**
* Constructs a unit converter that converts from one unit to another
* @param convertFrom unit you are converting from
* @param convertTo unit you want to convert to
*/

public UnitConverter(String convertFrom, String convertTo)
{
this.convertFrom = convertFrom;
this.convertTo = convertTo;
}

/**
* Gets the converted value
* @return getValue converted value
*/

public double getValue(double value)
{
//inches
if(convertFrom.equalsIgnoreCase("in") || convertFrom.equalsIgnoreCase("inch") || convertFrom.equalsIgnoreCase("inches"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_INCH * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_INCH * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_INCH * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_INCH * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_INCH * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_INCH * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_INCH * value;
}

//feet
else if(convertFrom.equalsIgnoreCase("ft") || convertFrom.equalsIgnoreCase("foot") || convertFrom.equalsIgnoreCase("feet"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_FOOT * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_FOOT * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_FOOT * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_FOOT * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_FOOT * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_FOOT * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_FOOT * value;
}

//miles
else if(convertFrom.equalsIgnoreCase("mi") || convertFrom.equalsIgnoreCase("mile") || convertFrom.equalsIgnoreCase("miles"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_MILE * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_MILE * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_MILE * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_MILE * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_MILE * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_MILE * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_MILE * value;
}

//millimeters
else if(convertFrom.equalsIgnoreCase("mm") || convertFrom.equalsIgnoreCase("millimeter") || convertFrom.equalsIgnoreCase("millimeters"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_MILLIMETER * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_MILLIMETER * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_MILLIMETER * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_MILLIMETER * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_MILLIMETER * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_MILLIMETER * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_MILLIMETER * value;
}

//centimeters
else if(convertFrom.equalsIgnoreCase("cm") || convertFrom.equalsIgnoreCase("centimeter") || convertFrom.equalsIgnoreCase("centimeters"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_CENTIMETER * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_CENTIMETER * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_CENTIMETER * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_CENTIMETER * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_CENTIMETER * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_CENTIMETER * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_CENTIMETER * value;
}

//meters
else if(convertFrom.equalsIgnoreCase("m") || convertFrom.equalsIgnoreCase("meter") || convertFrom.equalsIgnoreCase("meters"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_METER * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_METER * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_METER * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_METER * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_METER * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_METER * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_METER * value;
}

//kilometers
else if(convertFrom.equalsIgnoreCase("km") || convertFrom.equalsIgnoreCase("kilometer") || convertFrom.equalsIgnoreCase("kilometers"))
{
if(convertTo.equalsIgnoreCase("in") || convertTo.equalsIgnoreCase("inch") || convertTo.equalsIgnoreCase("inches"))
convertedResult = INCHES_PER_KILOMETER * value;
else if(convertTo.equalsIgnoreCase("ft") || convertTo.equalsIgnoreCase("foot") || convertTo.equalsIgnoreCase("feet"))
convertedResult = FEET_PER_KILOMETER * value;
else if(convertTo.equalsIgnoreCase("mi") || convertTo.equalsIgnoreCase("mile") || convertTo.equalsIgnoreCase("miles"))
convertedResult = MILES_PER_KILOMETER * value;
else if(convertTo.equalsIgnoreCase("mm") || convertTo.equalsIgnoreCase("millimeter") || convertTo.equalsIgnoreCase("millimeters"))
convertedResult = MILLIMETERS_PER_KILOMETER * value;
else if(convertTo.equalsIgnoreCase("cm") || convertTo.equalsIgnoreCase("centimeter") || convertTo.equalsIgnoreCase("centimeters"))
convertedResult = CENTIMETERS_PER_KILOMETER * value;
else if(convertTo.equalsIgnoreCase("m") || convertTo.equalsIgnoreCase("meter") || convertTo.equalsIgnoreCase("meters"))
convertedResult = METERS_PER_KILOMETER * value;
else if(convertTo.equalsIgnoreCase("km") || convertTo.equalsIgnoreCase("kilometer") || convertTo.equalsIgnoreCase("kilometers"))
convertedResult = KILOMETERS_PER_KILOMETER * value;
}
return convertedResult;
}
}

这是我的测试仪:

import java.util.Scanner;

public class UnitConverterTester
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
System.out.println("Convert from: ");
String input = in.nextLine();
System.out.println("Convert to: ");
String output = in.nextLine();

System.out.println("Value: ");
double number = in.nextDouble();
UnitConverter one = new UnitConverter(input, output);
double converted = one.getValue(number);
System.out.print(number + " " + input + " " + "=" + " " + converted + " " + output);
}
}

抱歉这么长!感谢您的时间和帮助! :)

最佳答案

表达式 final double FEET_PER_INCH = (1/12); 始终将 FEET_PER_INCH 设置为 0。这是因为 integer division - 两个操作数都不是浮点值,因此浮点结果被丢弃。

要解决此问题,您可以进行除法运算,或将数字更改为小数。

示例:

final double FEET_PER_INCH = (double)(1/12);
// or
final double FEET_PER_INCH = 1.0/12;

关于java - 单位转换器...不断返回 0,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20806539/

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