我正在製作一個省分類器,並且要求我必須保持主類不變,並創建一個名爲Munge的私人類,我已經過了好幾個小時,改變了我的代碼幾百次,基本上它看起來像這樣問題從文件中讀取數據並使用2D數組對數據進行排序
安大略省漢密爾頓市
多倫多,安大略省
艾伯塔省埃德蒙頓
紅鹿市,艾伯塔省
一個文本文件中讀取 紐約州聖約翰斯
,並且需要以這樣
阿爾伯塔輸出;埃德蒙頓,Red Deer
安大略省;漢密爾頓,多倫多
紐芬蘭;聖約翰
我的主類是不可改變的,看起來像這樣
public class Lab5 {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
if(args.length < 2) {
System.err.println("Usage: java -jar lab5.jar infile outfile");
System.exit(99);
}
Munge dataSorter = new Munge(args[0], args[1]);
dataSorter.openFiles();
dataSorter.readRecords();
dataSorter.writeRecords();
dataSorter.closeFiles();
}
}
和Munge時間類我所做的看起來像這樣
package lab5;
import java.io.File;
import java.util.Scanner;
import java.util.Formatter;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;
public class Munge
{
private String inFileName, outFileName;
private Scanner inFile;
private Formatter outFile;
private int line = 0;
private String[] data;
public Munge(String inFileName, String outFileName)
{
this.inFileName = inFileName;
this.outFileName = outFileName;
data = new String[100];
}
public void openFiles()
{
try
{
inFile = new Scanner(new File(inFileName));
File file = new File("input.txt");
SortedMap<String, List<String>> map = new TreeMap<String, List<String>>();
Scanner scanner = new Scanner(file).useDelimiter("\\n");
while (scanner.hasNext()) {
String newline = scanner.next();
if (newline.contains(",")) {
String[] parts = newline.split(",");
String city = parts[0].trim();
String province = parts[1].trim();
List<String> cities = map.get(province);
if (cities == null) {
cities = new ArrayList<String>();
map.put(province, cities);
}
if (!cities.contains(city)) {
cities.add(city);
}
}
}
for (String province : map.keySet()) {
StringBuilder sb = new StringBuilder();
sb.append(province).append(": ");
List<String> cities = map.get(province);
for (String city : cities) {
sb.append(city).append(", ");
}
sb.delete(sb.length() - 2, sb.length());
String output = sb.toString();
System.out.println(output);
}
}
catch(FileNotFoundException exception)
{
System.err.println("File not found.");
System.exit(1);
}
catch(SecurityException exception)
{
System.err.println("You do not have access to this file.");
System.exit(1);
}
try
{
outFile = new Formatter(outFileName);
}
catch(FileNotFoundException exception)
{
System.err.println("File not found.");
System.exit(1);
}
catch(SecurityException exception)
{
System.err.println("You do not have access to this file.");
System.exit(1);
}
}
public void readRecords()
{
while(inFile.hasNext())
{
data[line] = inFile.nextLine();
System.out.println(data[line]);
line++;
}
}
public void writeRecords()
{
for(int i = 0; i < line; i++)
{
String tokens[] = data[i].split(", ");
Arrays.sort(tokens);
for(int j = 0; j < tokens.length; j++)
outFile.format("%s\r\n", tokens[j]);
}
}
public void closeFiles()
{
if(inFile != null)
inFile.close();
if(outFile != null)
outFile.close();
}
}
你必須原諒我的括號中,那裏的netbeans格式正確,但我必須將底部的代碼保留在代碼塊中
這聽起來像是功課,所以我添加了標籤。 – 2012-04-13 17:45:38
您應該根據您目前在解決方案中遇到的特定問題提出具體問題。你已經寫了一些代碼,但是你沒有給出它如何不工作的跡象。我懷疑你的代碼沒有工作,但你並沒有真正問過任何問題。 – digitaljoel 2012-04-13 17:49:29