错误：非法的Characher：'\ u00bf'
所以我正在研究我的java编码类的最终项目，当我尝试编译测试文件时，我收到一个错误：非法字符：'\ u00bf'我试过搜索错误而我找不到太多帮助解决错误。
/*
* File: USCrimeClass.java
* Author: Darren Pirtle Jr.
* Date: Decemeber 12, 2016
*
*/
import java.util.File;
import java.util.FileInputStream;
import java.util.FileNotFoundException;
import java.util.Scanner;
public class TestUSCrime {
static Scanner input = new Scanner(System.in);
/**
*
* @param args
*/
public static void main(String[] args) {
long startTime = System.currentTimeMillis();
long endTime = 0;
System.out.println("********** Welcome to the US Crime Statistical Application ******************");
if (args.length != 1) {
System.out.println("Usage: \"java UserCrimeStatsApp Crime.csv");
return;
}
USCrimeClass[] data = read(args[0]);
String choice;
while (true) {
String menu = "\nEnter the number of the question you want answered. Enter ‘Q’ to quit the program :\n"
+ "1. What were the percentages in population growth for each consecutive year from 1994 – 2013?\n"
+ "2. What year was the Murder rate the highest?\n"
+ "3. What year was the Murder rate the lowest?\n"
+ "4. What year was the Robbery rate the highest?\n"
+ "5. What year was the Robbery rate the lowest?\n"
+ "6. What was the total percentage change in Motor Vehicle Theft between 1998 and 2012?\n"
+ "7. What was the total percentage change in property crimes between 2011 and 2013?\n"
+ "8. What was the total percentage change in murder crimes between 2012 and 2013?\n"
+ "Q. Quit the program";
System.out.println(menu);
choice = getInput();
System.out.println();
switch (choice) {
case "1":
showPercentage(data);
break;
case "2":
System.out.println("The Murder rate was highest in "
+ murderRate(data));
break;
case "3":
System.out.println("The Murder rate was lowest in "
+ lowestMurderRate(data));
break;
case "4":
System.out.println("The Robbery rate was highest in "
+ highestRobberyRate(data));
break;
case "5":
System.out.println("The Robbery rate was lowest in "
+ lowestRobberyRate(data));
break;
case "6":
System.out.println("Total Percentage change in motor vehicle theft between(1998-2012) is "
+ String.format("%.4f", chnage1998_2012(data))
+ "%");
break;
case "7":
System.out.println("Total Percentage change in property crimes between 1994 and 1998 is "
+ String.format("%.4f", chnage1994_1998(data))
+ "%");
break;
case "8":
System.out.println("Total Percentage change in murder crimes between 2012 and 2013 is "
+ String.format("%.4f", chnage2012_2013(data))
+ "%");
break;
case "Q":
System.out.println("Thank you for trying the US Crimes Statistics Program.");
endTime = System.currentTimeMillis();
System.out.println("Elapsed time in seconds was: "
+ (endTime - startTime) / 1000);
return;
default:
System.out.println("Error: Invalid choice selected!! Try again.\n");
break;
}
}
}
/**
* Display menu to user
*/
static void displayMenu() {
}
public static String getInput() {
String choice;
System.out.print("\nEnter your selection: ");
choice = input.next();
return choice;
}
/**
* Return the highest murder rate for a year
*
* @param data
* @return year with highest murder rate
*/
public static int murderRate(USCrimeClass[] data) {
int year = 0;
float maxRate = 0;
for (USCrimeClass crime : data) {
if (crime.getMurderRate() > maxRate) {
maxRate = crime.getMurderRate();
year = crime.getYear();
}
}
return year;
}
/**
* Return the lowest murder rate for a year
*
* @param data
* @return year with lowest murder rate
*/
public static int lowestMurderRate(USCrimeClass[] data) {
int year = 0;
float minRate = data[0].getMurderRate();
for (USCrimeClass crime : data) {
if (crime.getMurderRate() < minRate) {
minRate = crime.getMurderRate();
year = crime.getYear();
}
}
return year;
}
/***
*
* @param data
* @return
*/
public static int highestRobberyRate(USCrimeClass[] data) {
int year = 0;
float maxRate = 0;
for (USCrimeClass crime : data) {
if (crime.getRobberyRate() > maxRate) {
maxRate = crime.getRobberyRate();
year = crime.getYear();
}
}
return year;
}
/****
*
* @param data
* @return
*/
public static int lowestRobberyRate(USCrimeClass[] data) {
int year = 0;
float minRate = data[0].getRobberyRate();
for (USCrimeClass crime : data) {
if (crime.getRobberyRate() < minRate) {
minRate = crime.getRobberyRate();
year = crime.getYear();
}
}
return year;
}
/**
* Calculate the percentage change in motor vehicle theft between
* 1998-2012
*
* @param data
* @return
*/
static float chnage1998_2012(USCrimeClass[] data) {
float change;
int motorVehicleTheftIn1998 = data[4].getMotorVehicleTheft();
int motorVehicleTheftIn2012 = data[18].getMotorVehicleTheft();
change = (float) (motorVehicleTheftIn2012 - motorVehicleTheftIn1998)* 100 / motorVehicleTheftIn1998;
return change;
}
/***
*
* @param data
* @return
*/
public static float chnage2012_2013(USCrimeClass[] data) {
float change;
float rate2012 = data[18].getMurderRate();
float rate2013 = data[19].getMurderRate();
change = (rate2013 - rate2012) * 100 / rate2012;
return change;
}
/***
*
* @param data
* @return
*/
public static float chnage1994_1998(USCrimeClass[] data) {
float change;
int rate1994 = data[2].getPropertyCrime();
int rate1998 = data[6].getPropertyCrime();
change = (float) (rate1998 - rate1994) * 100 / rate1994;
return change;
}
/**
* Display the percentage population for each consecutive year
*
* @param data
*/
static void showPercentage(USCrimeClass[] data) {
float growth;
for (int i = 0; i < data.length - 1; i++) {
growth = 100 * (float) (data[i + 1].getPopulation() - data[i]
.getPopulation()) / data[i].getPopulation();
System.out.println("[" + data[i].getYear() + "-"
+ data[i + 1].getYear() + "]: "
+ String.format("%.4f", growth) + "%");
}
}
/**
* function handles the choice given by the user
*
* @param data
*/
static void handleMenu(USCrimeClass[] data) {
}
/***
* Read file data
*
* @param filename
* @return
*/
public static USCrimeClass[] read(String filename) {
USCrimeClass[] stats = new USCrimeClass[20];
int count = 0;
String line;
try {
// read file
Scanner inputReader = new Scanner(new File(filename));
// ignore column name
inputReader.nextLine();
while (inputReader.hasNext()) {
line = inputReader.nextLine();
String[] data = line.split(",");
stats[count] = new USCrimeClass(Integer.parseInt(data[0]));
stats[count].setPopulation(Integer.parseInt(data[1]));
stats[count].setMurderRate(Float.parseFloat(data[5]));
stats[count].setMotorVehicleTheft(Integer.parseInt(data[18]));
stats[count].setPropertyCrime(Integer.parseInt(data[12]));
stats[count].setRobberyRate(Float.parseFloat(data[9]));
count++;
}
}
catch (FileNotFoundException e) {
System.out.println(e);
}
return stats;
}
}
enter code here
1 个答案:
答案 0 :(得分：3)
您似乎已将源代码文件保存为带有BOM（字节顺序标记）的UTF-16编码文档。
您可以尝试将其保存为UTF-8并使用-encoding utf8
编辑：我可能错了。可能是您已经在使用UTF-8（https://en.wikipedia.org/wiki/Byte_order_mark），在这种情况下，只需将-encoding utf8添加到javac命令就可以了，或者将源文件保存为utf-8而不用bom
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