')'预期的错误....想不通

Question

我得到了编译错误：')' expected error，但正如您在下面的代码中看到的那样，没有任何不平衡的括号。可能是什么。

这是我在学校作业的代码：

import java.util.*;
import java.io.*;
public class Assignment7b {

public static void main(String[] args)throws FileNotFoundException {
  ArrayMath A = new ArrayMath();
    Scanner console = new Scanner(System.in);
    System.out.print("Enter file name: ");
    String fileName = console.next();
    Scanner input = new Scanner(new File(fileName));
    int[][] matrixA = makeMatrix(input);
    int[][] matrixB = makeMatrix(input);
    int[][] matrixC = makeMatrix(input);
    int[][] matrixD = makeMatrix(input);
    int[][] addResult = A.addArrays(matrixA, matrixB);
    int[][] subResult = A.subArrays(matrixA, matrixB);
    int[][] multResult = A.multArrays(matrixC, matrixD);
    System.out.print("Output file name: ");
    String outputFile = console.next();
    output(outputFile, matrixA, matrixB, matrixC, matrixD, addResult, subResult, multResult);
}
public static int[][] makeMatrix(Scanner input) {
    int rows = input.nextInt();
    int col = input.nextInt();
    int[][] thisMatrix = new int[rows][col];
    for(int i = 0; i < rows; i++) {
        input.nextLine();
        for(int j = 0; j < col; j++) {
            int num = input.nextInt();
            thisMatrix[i][j]++;             
        }
   }
    return thisMatrix;
}
public static void output(String outputFile, int[][] matrixA, int[][] matrixB, int[][] matrixC, int[][] matrixD, int[][] addResult, int[][] subResult, int[][] multResult) throws FileNotFoundException {
    PrintStream out = new PrintStream(new File(outputFile));
    ArrayMath A = new ArrayMath();    
    out.print("MATRIX A: /n");
    out.print(A.2dArrayText(matrixA));
    out.print("MATRIX B: /n");
    out.print(A.2dArrayText(matrixB));
    out.print("A PLUS B: /n");
    out.print(A.2dArrayText(addResult));
    out.print("A MINUS B: n");
    out.print(A.2dArrayText(subResult));
    out.print("MATRIX C: n");
    out.print(A.2dArrayText(matrixC));
    out.print("MATRIX D: n");
    out.print(A.print2dArray(matrixD));
    out.print("C TIMES D: n");
    out.print(A.2dArrayText(multResult));
}
}

我所有的out.print（）行都有一个错误。我检查了所有地方，没有看到不平衡的括号，但我仍然会收到这样的错误

Assignment7b.java:47: ')' expected

我已经在谷歌上搜索了这个问题，但无法解决，所以我正在咨询Stack Overflow的专家。非常感谢您的帮助。

Answer 1

方法名不能像2dArrayText那样以数字开头。这会使编译器感到困惑。

Answer 2

Repro

class X {
    void y() {
        System.out.println( A.1d());
    }
}
javac X.java
X.java:3: error: ')' expected
    System.out.println( A.1d());
                         ^

答：不要将数字作为标识符的第一个字符。