[英]How do you scan individual characters from each line of string in a .txt file into a 2D array?
[英]JAVA How do you scan a .txt file and allocate individual characters it to a 2d boolean array using charAt(int)?
首先,感謝您抽出寶貴時間來解決問題。
我是一個完整的菜鳥(第3天編程),這說明了為什么我花了無數次嘗試來解決此問題,但仍未弄清楚的原因:
問題:如何掃描由字符串(*和_)組成的.txt文件,並將其轉換為布爾數組(即* = true和_ = false)(也如何打印出來?)猜測我們也需要double for循環)? 掃描程序似乎無法在主要方法中運行,並且出現“無此類文件”錯誤。
額外的問題:如何迭代網格(例如使用for循環),以使新網格替換舊網格,而最新網格變為不間斷的新網格? 我對'show()'方法並不熟悉,但是我有點喜歡它。
這是我不完整的代碼,可讓您對問題有所了解:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
public class GameOfLife {
public static boolean[][] gen() throws IOException {
Scanner scanner = new Scanner(new File("seed.txt"));
int rows = 0, columns = 0;
while (scanner.hasNextLine()) {
String s = scanner.nextLine();
if (s.length() > columns)
columns = s.length();
rows++;
}
boolean[][] grid = new boolean[rows][columns + 1];
Scanner scanner1 = new Scanner(new File("seed.txt"));
String line;
for (int r = 0; r < rows; r++) {
line = scanner1.nextLine();
System.out.println(line);
for (int c = 0; c <= line.length(); c++) {
if (r == line.length()) {
break;
}
if(line.charAt(r) == '*') {
grid[r][c] = true;
}
}
}
return grid;
}
public static boolean[][] nextGen(boolean[][] cells){
boolean[][] newCells = new boolean[cells.length][cells[0].length];
int num;
for(int r = 0; r < cells.length; r++){
for(int c = 0; c < cells[0].length; c++){
num = numNeighbours(cells, r, c);
if (occupiedNext(num, cells[r][c]))
newCells[r][c] = true;
}
}
return newCells;
}
public static void main(String[] args) throws IOException{
boolean[][] cells = gen();
show(cells);
cells = nextGen(cells);
show(cells);
Scanner scanner2 = new Scanner(new File("seed.txt"));
while(scanner2.nextLine().length() != 0){
cells = nextGen(cells);
show(cells);
}
}
private static boolean inbounds(boolean[][] cells, int r, int c) {
return r >= 0 && r < cells.length && c >= 0 &&
c < cells[0].length;
}
private static int numNeighbours(boolean[][] cells, int row, int col) {
int num = cells[row][col] ? -1 : 0;
for (int r = row - 1; r <= row + 1; r++)
for(int c = col - 1; c <= col + 1; c++)
if (inbounds(cells, r, c) && cells[r][c] )
num++;
return num;
}
public static void show(boolean[][] grid){
String s = "";
for(boolean[] row : grid){
for(boolean val : row)
if(val)
s += "*";
else
s += "_";
s += "\n";
}
System.out.println(s);
}
public static boolean occupiedNext(int numNeighbours, boolean occupied){
if (occupied && (numNeighbours == 2 || numNeighbours == 3))
return true;
else if (!occupied && numNeighbours == 3)
return true;
else
return false;
}
}
我只想提出一個可能對您有所幫助的解決方案。 嘗試讀取文件內容並將其分配給字符串變量。 現在使用string.replaceAll
方法將(* and _)
為* = true and _ = false
。 比將更新的字符串寫入文件。
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