Question

我从.txt文件中获取输入并将其存储到ArrayList中。我需要摆脱所有空格，以便将void btnEvent_Click(object sender, EventArgs e) { var button = sender as Button; //Searching... int x,y; for(x = 0; x < btn.GetLength(0); x++) { bool found = false; for(y = 0; y < btn.GetLength(1); y++) { if(btn[x,y] == button ) { found = true; break; } } if(found) break; } //Now x,y have the correct coordinates. }解析为ArrayList。我将发布注释掉的部分，以便您可以看到我尝试使用它来执行此操作。谢谢。如果你能给我一个看起来很棒的地方。

<Integer>

这是我正在阅读的.txt文件，import java.io.*; import java.util.*; public class LabWriterReadre { public static void main(String [] args){ BufferedReader br = null; BufferedWriter bw = null; // fileWriter = new FileWriter("output.txt",false); ArrayList<String> storage = new ArrayList<String>(); ArrayList<String> convertToInt = new ArrayList<String>(); ArrayList<Integer> matrix = new ArrayList<Integer>(); String strLine = ""; int row1,col1,row2,col2; try { br = new BufferedReader( new FileReader("C:/Users/jeremiahlukus/Desktop/New folder/jj.txt")); while( (strLine = br.readLine()) != null) { System.out.println(strLine); storage.add(strLine); } } catch (FileNotFoundException e) { System.err.println("Unable to find the file: fileName"); } catch (IOException e) { System.err.println("Unable to read the file: fileName"); } /* String[] trimmedArray = new String[string.size()]; for (int i = 0; i < string.size(); i++) { trimmedArray[i] = string[i].trim(); string.removeAll(Arrays.asList(null,"")); } */ //string.removeAll(Collections.singleton("")); // string.removeAll(Arrays.asList(null,"") for (String str : storage) { if (//str != " ") !str.isEmpty()) { convertToInt.add(str); //convertToInt.trim(); } } System.out.println(convertToInt); } /* row1 = Integer.parseInt(convertToInt.get(0)); col1 = Integer.parseInt(convertToInt.get(1)); row2 = Integer.parseInt(convertToInt.get(2)); col2 = Integer.parseInt(convertToInt.get(3)); int[][] matrix1=new int[row1][col1]; int[][] matrix2=new int[row2][col2]; */ // System.out.println(row1); /*表示空格

这是打印出的ArrayList

3___________3
3_4

1 ______2 3 
4_5 _6
7 _8 _9

1 _2_ 3_ 4
5 _6 _7 _8
9_ 10_ 11_ 12

这就是我想要发生的事情

[3______3,_3 _4,__ 1_______2_ 3 , ___4 _5 _6, 7_ 8 _9, 1_ 2_ 3_ 4, 5 _6_ 7_ 8, 9 _10_ 11_ 12]

Answer 1

添加线时，您可以直接替换（＆＃34;＆＃34;，＆＃34;＆＃34;）。此外，这个代码可以更有效。

Answer 2

每一行都可以使用像这样的正则表达式进行解析

List<String> sequence = new ArrayList<String>();
Patter noSpacesPattern = Pattern.compile("(\\S+)");
Matcher matches;

// reading your line from file here, now for each line do this

matches = noSpacesPattern.matcher(strLine);

while (matches.find())
    sequence.add(matches.group());

这将消除不必要的空间并使代码保持可读性。

Answer 3

尝试在数组中读取文件时使用replaceAll()删除所有空格。

while( (strLine = br.readLine()) != null)
{
     System.out.println(strLine);
     storage.add(strLine.replaceAll("\\s+",""));             
}

Answer 4

我可能错了，但看起来你的代码可以用

之类的东西来解决和简化

Scanner input = new Scanner(new File("C:/Users/jeremiahlukus/Desktop/New folder/jj.txt"));
List<Integer> numbers = new ArrayList<>();
while(input.hasNextInt()){
    numbers.add(input.nextInt());
}

我在这里假设你的文件只包含用空格分隔的数字（也包括行分隔符）。

Answer 5

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Test {

  public static void main(String[] args)
  {

      String total="";
      List list=new ArrayList();
    list.add("3______3");
    list.add("_3 _4");
    list.add("__ 1_______2_ 3");
    list.add("3 ");
    list.add(" ___4 _5 _6");
    list.add(" 7_ 8 _9");

    list.add(" 1_ 2_ 3_ 4");
   list.add(" 5 _6_ 7_ 8");
   list.add(" 9 _10_ 11_ 12");

      String firstname1 = list.toString();
      String regex = "[0-9]+";
      firstname1 = firstname1.replaceAll("_", ",");

      firstname1 = firstname1.replace(",", ",");

      String str = firstname1.toString().replaceAll("\\s+", ",").replace("[", "").replace("]", "");

      String arr[] = str.split(",");

      for (int i = 0; i < arr.length; i++) {
          if (arr[i].matches(regex)) {

              total += arr[i] + ",";
          }
      }
      total = total.substring(0, total.length() - 1);
      List finalList = Arrays.asList(total);

      System.out.println(finalList);
     //output-->> [3,3,3,4,1,2,3,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,10,11,12]
  }
}

Answer 6

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Test {

  public static void main(String[] args) throws FileNotFoundException, IOException
  {
      String total="";
      List list=new ArrayList();


         try {
           BufferedReader br = new BufferedReader( new FileReader("filename.txt"));
            while( (total = br.readLine()) != null)
            {
           list.add(total);             
            }
            br.close();

        } catch (FileNotFoundException e) {
            System.err.println("Unable to find the file: fileName");
        }

      String firstname1 = list.toString();
      String regex = "[0-9]+";
      firstname1 = firstname1.replaceAll("_", ",");

      firstname1 = firstname1.replace(",", ",");

      String str = firstname1.toString().replaceAll("\\s+", ",").replace("[", "").replace("]", "");

      String arr[] = str.split(",");
      String sum="";
      for (int i = 0; i < arr.length; i++) {

          if (arr[i].matches(regex)) {

              sum += arr[i] + ",";

          }
      }
      sum = sum.substring(0, sum.length() - 1);
      List finalList = Arrays.asList(sum);

      System.out.println("finallist-->>>"+finalList);
     //output-->> [3,3,3,4,1,2,3,3,4,5,6,7,8,9,1,2,3,4,5,6,7,8,9,10,11,12]
  }
}

删除ArrayList中的所有空格。 Java的

6 个答案: