从输入文件中输出数组 [英] Shellsorting an array from an input file
问题描述
完整项目是从一个文件中获取数据,该文件是一个文本文件,其中包含所有201个国家/地区的列表及其各自的互联网使用率,按字母顺序排列。这是一个例子
The full project is to take data in from a file which is a text file containing a list of all 201 countries and their respective rates of internet use in alphabetical order. Here is an example
Afghanistan 7
Albania 63
Algeria 20
Andorra 97
Angola 23
...
有了这个我们必须Shellsort(特别是)数据数据。我已成功完成此操作,但我只输出百分比列表,其中我也需要列出的国家/地区。这是我的代码:
With this we have to Shellsort (specifically) the data numerically. I have successfully done this but I only am outputting a list of the percentages, where as I need the countries listed as well. Here is my code:
import java.io.*;
import java.util.*;
public class InternetUsers {
public static void main(String[] args) throws IOException{
// TODO Auto-generated method stub
String populationString = "";
String[] line = new String[201];
int populations[] = new int[201];
Scanner fileIN = new Scanner(new File("F:/CountrySortedAlpha.txt"));
while(fileIN.hasNext()){
for(int i = 0; i < 201; i++){
populationString = fileIN.nextLine().substring(26, 29);
populations[i] = Integer.parseInt(populationString.trim());
}
int j;
for(int gap = populations.length / 2; gap > 0; gap /= 2){
for (int k = 0; k < populations.length; k++){
}
for (int t = gap; t < populations.length; t++){
int tmp = populations[t];
for(j = t; j >= gap && (tmp < populations[j - gap]); j -= gap){
populations[j] = populations[j - gap];
}
populations[j] = tmp;
}
}
System.out.println("\nFinal sorted order: ");
for(int k = 0; k < populations.length; k++){
System.out.print(populations[k]);
System.out.println("");
}
System.out.println();
}
}
}
所以我的问题是怎么样我还要输出这些国家?我需要完全重做我排序的方式吗?这是我的示例输出:
So my question is how am I to go about outputting the countries as well? do I need to completely redo the way I sorted? Here is my sample output:
Final sorted order:
1
1
2
2
2
2
2
3
....
推荐答案
解析文件时,需要将解析后的值存储在字典或其他结构中。排序后,在打印时,从字典中读取值。
When you parse the file, you need to store parsed value in a dictionary or some other structure. After you sort, when printing, read the values from dictionary.
我修改了代码以在字典中存储值,并在我添加/修改的行中添加了注释。我没有触及你的排序算法,所以你仍然在同一个数组上排序:
I modified you code to store values in a dictionary, and added comments to the lines I added/modified. I did not touch your sorting algo, so you are still sorting on the same array:
public static void main(String[] args) throws IOException {
String populationString = "";
String[] line = new String[201];
int populations[] = new int[201];
// Have a dictionary that can store the values you parse
Map<Integer, String> dictionary = new HashMap<Integer, String>();
Scanner fileIN = new Scanner(new File("F:/CountrySortedAlpha.txt"));
while (fileIN.hasNext()) {
for (int i = 0; i < 201; i++) {
// Parse the whole line, this 29 hard coded seems incorrect
populationString = fileIN.nextLine().substring(0, 29);
// Grab both values
String[] splited = populationString.split("\\s+");
// Country name can have spaces, so take the last elemnt
populations[i] = Integer.parseInt(splited[splited.length - 1]);
// Join back values
String country = populationString.join(" ", splited);
// Cut off the rate number
country = country.substring(0, country.lastIndexOf(" "));
// Store them in your dictionary
if (dictionary.containsKey(populations[i])) {
// If multiple countries have same rate, add them to value, and separate with comma
String value = dictionary.get(populations[i]);
dictionary.put(populations[i], value + "," + country);
} else {
dictionary.put(populations[i], country);
}
}
int j;
for (int gap = populations.length / 2; gap > 0; gap /= 2) {
for (int t = gap; t < populations.length; t++) {
int tmp = populations[t];
for (j = t; j >= gap && (tmp < populations[j - gap]); j -= gap) {
populations[j] = populations[j - gap];
}
populations[j] = tmp;
}
}
System.out.println("Final sorted order: ");
for (int k = 0; k < populations.length; k++) {
// Read the value from dictionary
String value = dictionary.get(populations[k]);
// For duplicates skip, that entry gets deleted after values were printed
if (value == null) {
continue;
}
// If multiple countries had the same rate, they were stored as comma separated value
String[] countries = value.split(",");
for (String country : countries) {
// You can print rate, or country, or both
System.out.println(populations[k] + " " + country);
}
// Remove from dictionary, because we already printed all countries with the same rate
dictionary.remove(populations[k]);
}
System.out.println();
}
// Don't forget to close the file
fileIN.close();
}
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