我正在做一个处理类和对象的作业。在它中,我有一个Address类,Letter类和PostOffice类,它们在调用PostOffice时会接收一个输入文件并扫描它,基本上以输入文件中所有内容的方式将其显示在一个字母上(如:bla,from :BLA,邮资金额,并从地址等)Java。阅读输入时遇到的问题
我得到一条错误:
Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Scanner.java:1516)
at PostOffice.readLetters(PostOffice.java:33)
at PostOffice.main(PostOffice.java:14)
和我真的不明白为什么....
这里是我的岗位办公室班级:
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
public class PostOffice {
private final int MAX = 1000;
private Letter [] letterArray = new Letter[MAX];
private int count;
public static void main(String [] args) {
PostOffice postOffice = new PostOffice();
postOffice.readLetters("letters.in");
postOffice.sortLetters();
postOffice.printLetters();
}
public PostOffice() {
Letter [] myLetters = letterArray;
this.count = 0;
}
public void readLetters(String filename) {
String toName, toStreet, toCity, toState, toZip;
String fromName, fromStreet, fromCity, fromState, fromZip, temp; //, weight;
double weight;
int index;
Scanner s = new Scanner(filename);
if (s != null) {
while(s.hasNext()){
toName = s.nextLine();
toStreet = s.nextLine();
temp = s.nextLine();
index = temp.indexOf(",");
toCity = temp.substring (0, index);
index = index + 2;
toState = temp.substring (index, index + 2);
toZip = temp.substring (index);
fromName = s.nextLine();
fromStreet = s.nextLine();
temp = s.nextLine();
index = temp.indexOf(",");
fromCity = temp.substring (0, index);
index = index + 2;
fromState = temp.substring (index, index + 2);
fromZip = temp.substring (index);
String var = s.nextLine();
weight = Double.parseDouble(var);
//weight = s.nextLine();
Letter l = new Letter(toName, toStreet, toCity, toState, toZip, fromName, fromStreet, fromCity, fromState, fromZip, weight);
this.count += 1;
this.letterArray[count - 1] = l;
}
}
s.close();
}
public static void sortLetters() {
//call sortSearchUtil This method should call the compareTo method provided by the Letter class to sort.
//You may use any sorting routine you wish (see SortSearchUtil.java)
}
public static void printLetters() {
//call tostring of letter class. print the count of Letters followed by the total postage followed
//by each Letter (make sure you use the toString method provided by the Address and Letter classes for this)
}
}
我的信类:
public class Letter extends PostOffice implements Comparable<Letter> {
private static final double POSTAGE_RATE = 0.46;
private String fromName;
private Address fromAddr;
private String toName;
private Address toAddr;
private double weight;
public Letter (String fromName, String fromStreet, String fromCity, String fromState, String fromZip, String toName,
String toStreet, String toCity, String toState, String toZip, double weight) {
this.fromName = fromName;
this.fromAddr = new Address(fromStreet, fromCity, fromState, fromZip);
this.toName = toName;
this.toAddr = new Address(toStreet, toCity, toState, toZip);
this.weight = weight;
}
public String toString() {
String result;
result = String.format("from: %s\t\t\t%5.2f\n%s", fromName, getPostage(weight), fromAddr);
result = result + String.format("\t\t To: %s\n\t\t%s", toName, toAddr);
return result;
}
public int compareTo(Letter that) {
int value;
value = this.toAddr.getZip().compareTo(that.toAddr.getZip());
return value;
}
public static double getPostage(double weight) {
double workWeight;
workWeight = weight + 0.999;
workWeight = (int)workWeight;
return workWeight * POSTAGE_RATE;
}
}
和我的地址类:
import java.awt.*;
import java.util.*;
public class Address {
private String street;
private String city;
private String state;
private String zip;
public Address (String street, String city, String state, String zip) {
this.street = street;
this.city = city;
this.state = state;
this.zip = zip;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
public String toString() {
String result;
result = String.format("%s\n%s, %s %s", street, city, state, zip);
return result;
}
}
,这是文本文件
Stu Steiner (NEW LINE) 123 Slacker Lane (NEW LINE) Slackerville, IL 09035 (NEW LINE) Tom Capaul(NEW LINE) 999 Computer Nerd Court (NEW LINE) Dweebsville, NC 28804-1359 (NEW LINE) 0.50 (NEW LINE) Tom Capaul (NEW LINE) 999 Computer Nerd Court (NEW LINE) Dweebsville, NC 28804-1359 (NEW LINE) Chris Peters (NEW LINE) 123 Some St. (NEW LINE) Anytown, CA 92111-0389 (NEW LINE) 1.55 (NEW LINE)
一切编译的内容,我只需要它像这样输出:
---------------------------------------------------------------------------- From: From value Postage value From Address value (be sure and use Address toString) To: To value To Address value (be sure and use Address toString) ----------------------------------------------------------------------------
您的问题不清楚从您的问题陈述。是否有任何产出?或者是有输出产生,但它是错误的输出? – 2012-01-17 20:11:24
根本没有输出。它给我一个错误邮局主要说:线程“主”异常java.util.NoSuchElementException:没有找到行 \t at java.util.Scanner.nextLine(Scanner.java:1516) \t at PostOffice.readLetters(PostOffice .java:33) \t at PostOffice.main(PostOffice.java:14) – anthony 2012-01-17 20:12:30
如果你可以编辑你的原始问题来包含错误代码以及一个合适的输入文件例子(几行将足够)。 – tim 2012-01-17 20:34:38