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[英]When reading a column in Excel file, this program reads data and empty columns
[英]reading data from file to calculate it when the program runs
该代码应通过从文件中读取括号和税率来计算累进税,但它显示输入不匹配错误。
编辑:可以编译和运行的示例(但仍然损坏)
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
/**
<P>{@code java CalculateProgressiveXmpl R:\\jeffy\\programming\\sandbox\\xbnjava\\xbn\\z\\xmpl\\lang\\Taxes.txt}</P>
**/
public class CalculateProgressiveXmpl {
private static double baseSalary = 0.0;
private static double tax = 0.0;
public static final void main(String[] as_1RqdPathToInput) {
try {
calculateProgressive(as_1RqdPathToInput[0]);
} catch(RuntimeException rtx) {
if(as_1RqdPathToInput.length == 0) {
throw new IllegalArgumentException("One required parameter missing: Path to Taxes.txt");
}
throw rtx;
} catch(IOException iox) {
throw new RuntimeException(iox);
}
}
public static final void calculateProgressive(String s_inputFile) throws FileNotFoundException,
IOException {
try {
Scanner readtax = new Scanner(new FileReader(s_inputFile));
String taxType = readtax.next();
String brackets = readtax.next();
int ammount = readtax.nextInt() - 1;
double tax1[] = new double[ammount + 1];
while (readtax.hasNext()) {
for (int i = 0; i <= ammount - 1; i++) {
double bottombracket = readtax.nextDouble();
double topbracket = readtax.nextDouble();
double ptax = readtax.nextDouble();
if ((bottombracket <= baseSalary)
&& (baseSalary >= topbracket)) {
tax1[i] = (topbracket - bottombracket) * ptax;
} else if ((baseSalary >= bottombracket)
&& (baseSalary <= topbracket)) {
tax1[i] = (baseSalary - bottombracket) * ptax;
} else {
if (i == ammount - 1) {
double fbottombracket = readtax.nextDouble();
double fptax = readtax.nextDouble();
tax1[i] = (baseSalary - fbottombracket) * ptax;
}
}
tax = tax + tax1[i];
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
堆栈跟踪:
Exception in thread "main" java.util.InputMismatchException at java.util.Scanner.throwFor(Unknown Source) at java.util.Scanner.next(Unknown Source) at java.util.Scanner.nextInt(Unknown Source) at java.util.Scanner.nextInt(Unknown Source) at CalculateProgressiveXmpl.calculateProgressive(CalculateProgressiveXmpl.java:30) at CalculateProgressiveXmpl.main(CalculateProgressiveXmpl.java:14)
有问题的行: calculateProgressive(as_1RqdPathToInput[0]);
关于如何解决它的任何建议?
如果这是您的数据:
"Progressive Tax Ammount of brackets: 2 0.0 30000.0 0.0 45001.0 45000.0 0.2 "
然后String taxType = readtax.next();
将是“ Progressive”,并且String brackets = readtax.next();
将是“税”。 您应该从那里看到问题:)
用调试器单步执行代码也应该很明显。
readtax.nextInt()
在实际上应为next()
早期就被调用,因为Ammount失败了整数的模式匹配。
尝试: "Progressive Tax 2 0.0 30000.0 0.0 45001.0 45000.0 0.2"
测试您的代码时,我发现InputMismatchException的两个不同原因:
1)正如其他人已经指出的那样,在第一个int之前您有太多的前导字符串。 因此,将您的输入更改为只有两个像预期的那样。
2)在我的语言环境中,我用,而不是。 (点)表示十进制值,因此Scanner使用“ \\\\”作为decimalSeparator,并且在解析输入时会在nextDouble上出现InputMismatchException失败。 我建议您也检查语言环境以验证设置。
注意:一旦我解决了这些问题,代码仍然会失败(这次是java.util.NoSuchElementException),所以我认为一旦摆脱InputMismatchException,您仍然必须重新编写算法。
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