[英]Create 2D array from text file in Java
我剛剛開始學習Java,現在嘗試輸入一個文本文件並將其制成二維字符串數組。 但是以某種方式它顯示在輸出中沒有找到任何行(NoSuchElementException)。 所以這是我的代碼:
public class Maze {
final static int Max_Maze_Row = 20;
final static int Max_Maze_Column = 50;
public static String mazearray;
public static void create() throws Exception
{
Scanner sc = new Scanner(new BufferedReader(new FileReader("Maze.txt")));
String [][] mazearray = new String[Max_Maze_Row][Max_Maze_Column];
while(sc.hasNextLine())
{
for(int i = 0 ;i<=Max_Maze_Row;i++)
{
for(int j = 0 ;j<=Max_Maze_Column;j++)
{
mazearray[i][j] = sc.nextLine();
System.out.println(mazearray[i][j]);
}
}
}
}
public static void display()
{
System.out.println(Maze.mazearray);
}
這是主要方法:
public static void main(String[] args) throws Exception
{
Maze mazeobject = new Maze();
mazeobject.create();
}
因此,文本文件如下所示: Maze.txt我見過很多論壇都在討論相同的問題,但是它們都不適用於我的問題。 提前致謝! 非常感謝您的幫助。
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.Arrays;
import java.util.Scanner;
public class Maze {
final static int Max_Maze_Row = 20;
public String[] mazearray;
public void create() throws Exception {
Scanner sc = new Scanner(new BufferedReader(new FileReader("./Maze.txt")));
mazearray = new String[Max_Maze_Row];
int i = 0;
while (sc.hasNextLine()) {
mazearray[i++] = sc.nextLine();
}
}
public void display() {
System.out.println(Arrays.deepToString(mazearray));
}
public static void main(String[] args) throws Exception {
Maze mazeobject = new Maze();
mazeobject.create();
mazeobject.display();
}
}
你必須確保有足夠的線路中的./Maze.txt
為您Max_Maze_Row = 20,Max_Maze_Column = 50必需的。 否則,此行mazearray[i][j] = sc.nextLine();
將因java.util.NoSuchElementException: No line found
而失敗java.util.NoSuchElementException: No line found
像這樣更改您的創建方法:
public static void create() throws Exception {
Scanner sc = new Scanner(new BufferedReader(new FileReader("Maze.txt")));
String[][] mazearray = new String[Max_Maze_Row][Max_Maze_Column];
int lineCounter = 0;
while (sc.hasNextLine()) {
String data = sc.nextLine();
for (int i = 0; i < data.length(); i++) {
mazearray[lineCounter][i] = String.valueOf(data.charAt(i));
System.out.print(mazearray[lineCounter][i]);
}
System.out.println();
lineCounter++;
}
}
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