该错误低于以下内容：
symbol：class CarbonDioxideData location：class CarbonAnalysis public static void category（CarbonDioxideData [] data，int size，Scanner input，PrintStream output）{^ CarbonAnalysis.java:65：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis public static void getData（Scanner c，CarbonDioxideData [] data，int size）{^ CarbonAnalysis.java:81：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis public static void swap（CarbonDioxideData [] data，int pose1，int pose2）{^ CarbonAnalysis.java:88：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis public static void total（CarbonDioxideData [] data，int size，PrintStream output）{^ CarbonAnalysis.java:107：找不到符号符号：class CarbonDioxideData location： class CarbonAnalysis public static void co2per（CarbonDioxideData [] data，int size，PrintStream output）{^ CarbonAnalysis.java:125：找不到符号符号：class CarbonDioxideData locat ion：class CarbonAnalysis public static void road（CarbonDioxideData [] data，int size，PrintStream output）{^ CarbonAnalysis.java:143：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis public static void cars（CarbonDioxideData [] data，int size，PrintStream输出）{^ CarbonAnalysis.java:161：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis public static void findCanada（CarbonDioxideData [] data，int size，String name，PrintStream output）{^ CarbonAnalysis.java:173 ：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis public static void printList（CarbonDioxideData [] data，int size，String s，PrintStream output）{^ CarbonAnalysis.java:32：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis CarbonDioxideData [] data = new CarbonDioxideData [size]; ^ CarbonAnalysis.java:32：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis CarbonDioxideData [] data = new CarbonDioxideData [size]; ^ CarbonAnalysis.java:67：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis data [i] = new CarbonDioxideData（）; ^ CarbonAnalysis.java:82：找不到符号符号：class CarbonDioxideData location：class CarbonAnalysis CarbonDioxideData temp = data [pose1]; ^
这是代码：
public static void main(String[] args) throws FileNotFoundException{
Scanner input = new Scanner(System.in);
PrintStream output = new PrintStream(new File("carbon_report.txt"));
if(args.length == 0){
System.out.println("No file command line found.");
System.out.println("Please type a filename");
System.exit(0);
}
// get a valid filename
File f = new File(args[0]);
while(f.exists() == false){
System.out.println("File doesn't exist. Please type a new name.");
String filename = input.nextLine();
f = new File(filename);
}
Scanner console = new Scanner(f);
console.nextLine();
int size = console.nextInt();
// create a new array of CarbonDioxideData
CarbonDioxideData[] data = new CarbonDioxideData[size];
getData(console, data, size);
category(data, size, input, output);
}
// get which categories the user want to analyze
public static void category(CarbonDioxideData[] data, int size, Scanner input, PrintStream output){
System.out.printf("%20s%30s", "1. totalCO2emissions", "2. roadCO2emissions");
System.out.printf("%50s%25s", "\n3. per-personRoadEmissions", "4. carsPer1000People");
System.out.println("\nHow many categories do you choose to analyze?");
int num = input.nextInt();
if(num>0){
System.out.println("Pleas choose the number of category you want to analyze(the number is in the front of each category):");
for(int i=1; i<=num; i++){
int category = input.nextInt();
if(category==1){
total(data,size, output);
output.println();
}else if(category==2){
road(data, size, output);
output.println();
}else if(category==3){
co2per(data, size, output);
output.println();
}else if(category==4){
cars(data, size, output);
output.println();
}
}
}
}
// set the array of CarbonDioxideData
public static void getData(Scanner c, CarbonDioxideData[] data, int size){
for(int i=0; i<size; i++){
data[i] = new CarbonDioxideData();
String country = c.next();
data[i].setCountry(country);
double total = c.nextDouble();
data[i].setTotalCO2(total);
double road = c.nextDouble();
data[i].setRoadCO2(road);
double co2per = c.nextDouble();
data[i].setCO2PerPerson(co2per);
int cars = c.nextInt();
data[i].setCarsPerPerson(cars);
}
}
public static void swap(CarbonDioxideData[] data, int pose1, int pose2){
CarbonDioxideData temp=data[pose1];
data[pose1]=data[pose2];
data[pose2]=temp;
}
// compare total CO2 emissions
public static void total(CarbonDioxideData[] data, int size, PrintStream output){
for(int i=0; i<size-1; i++){
int min = i;
for(int j=i+1; j<size; j++){
if(data[j].getTotalCO2()<data[min].getTotalCO2()){
min = j;
}
}
swap(data,i,min);
}
printList(data, size, "total emissions", output);
output.println("Country with the lowest total emissions: " + data[0].getCountry());
output.println("Country with the highest total emissions: " + data[size-1].getCountry());
findCanada(data, size, "lowest total emissions", output);
}
// compare the amount of per-person road emission
public static void co2per(CarbonDioxideData[] data, int size, PrintStream output){
for(int i=0; i<size-1; i++){
int min = i;
for(int j=i+1; j<size; j++){
if(data[j].getCO2PerPerson()<data[min].getCO2PerPerson()){
min = j;
}
}
swap(data,i,min);
}
printList(data, size, "per-person road emissions",output);
output.println("Country with the lowest per-person road emissions: " + data[0].getCountry());
output.println("Country with the highest per-person road emissions: " + data[size-1].getCountry());
findCanada(data, size, "lowest per-person road emissions.", output);
}
// analyze the road emissions
public static void road(CarbonDioxideData[] data, int size, PrintStream output){
for(int i=0; i<size-1; i++){
int min = i;
for(int j=i+1; j<size; j++){
if(data[j].getRoadCO2()<data[min].getRoadCO2()){
min = j;
}
}
swap(data,i,min);
}
printList(data, size, "road CO2 emissions",output);
output.println("Country with the lowest road emissions: " + data[0].getCountry());
output.println("Country with the highest road emissions: " + data[size-1].getCountry());
findCanada(data, size, "lowest road emissions.", output);
}
// analyze the number of cars per 1000 people
public static void cars(CarbonDioxideData[] data, int size, PrintStream output){
for(int i=0; i<size-1; i++){
int min = i;
for(int j=i+1; j<size; j++){
if(data[j].getCarsPerPerson()<data[min].getCarsPerPerson()){
min = j;
}
}
swap(data,i,min);
}
printList(data, size, "cars per 1000 people",output);
output.println("Country with the lowest cars per 1000 people: " + data[0].getCountry());
output.println("Country with the highest cars per 1000 people: " + data[size-1].getCountry());
findCanada(data, size, "lowest cars per 1000 people.", output);
}
// find the position of Canada in the given category
public static void findCanada(CarbonDioxideData[] data, int size, String name, PrintStream output){
int n = 1;
for(int i=0; i<size; i++){
String country = data[i].getCountry();
if(country.equals("Canada")){
n=i;
}
}
output.println("Canada is ranked " + (n+1) + " out of " + size+" for " +name);
}
// print the lists of total emissions or per-person road emission
public static void printList(CarbonDioxideData[] data, int size, String s, PrintStream output){
if(s.equals("per-person road emissions")){
output.println("The precedence table of total emissions:");
for(int i = 0; i<size; i++){
output.printf("%10s", data[i].getCountry());
output.printf("%10.2f",data[i].getCO2PerPerson());
output.println();
}
}else if(s.equals("total emissions")){
output.println("The precedence table of "+ s);
for(int i = 0; i<size; i++){
output.printf("%10s ", data[i].getCountry());
output.printf("%10.2f",data[i].getTotalCO2());
output.println();
}
}else if(s.equals("road CO2 emissions")){
output.println("The precedence table of "+ s);
for(int i = 0; i<size; i++){
output.printf("%10s ", data[i].getCountry());
output.printf("%10.2f",data[i].getRoadCO2());
output.println();
}
}else if(s.equals("cars per 1000 people")){
output.println("The precedence table of "+ s);
for(int i = 0; i<size; i++){
output.printf("%10s ", data[i].getCountry());
output.printf("%10d",data[i].getCarsPerPerson());
output.println();
}
}
}
}