我一直收到NoSuchElementException,但不知道为什么。我知道错误是针对扫描仪的,但不知道发生此错误的原因。我包括了输入文件。
import java.util.*;
import java.io.*;
public class Numbrosia {
static int [][] board = new int [5][5];
public static void main(String[]args){
Scanner scan = null;
try{
scan = new Scanner(new File("input.txt"));
}
catch(FileNotFoundException e){
e.printStackTrace();
return;
}
for(int row = 0; row<board.length; row++){
for(int col= 0; col<board.length;col++){
board[row][col] = scan.nextInt();
}
}
while(true){
showBoard();
System.out.println("");
System.out.println("Input number from 1 to 5: ");
int i = scan.nextInt();
System.out.println("Input move command: ");
String moveName = scan.next();
//If/ else statements to dictate which method to call
错误信息:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:838)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at excercises.Numbrosia.main(Numbrosia.java:25)
输入文件:
1 -2 1 0 0
-1 0 4 2 0
0 -4 1 -1 0
0 1 -1 -1 -2
0 -3 1 -1 0
最佳答案
由于没有要求扫描仪在完成从文件中读取后读取用户输入,因此它在询问用户输入号码后仍尝试从文件中读取。您需要创建一个新的扫描仪以从键盘读取。
将以下代码用于while循环:
scan.close();
Scanner kbScan = new Scanner(System.in);
while(true){
showBoard();
System.out.println("");
System.out.println("Input number from 1 to 5: ");
//This will read from the keyboard
int i = kbScan.nextInt();
System.out.println("Input move command: ");
String moveName = scan.next();
在需要从键盘读取的方法中的其他任何地方,请使用
kbScan
而不是scan
。关于java - NoSuchElementException二维数组,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/21807409/