char 的非法初始值设定项 — 如何修复？

Question

我想指定打印字符，但是我这里出错了。我应该怎么办？（查看我的代码）我只是在 Java 中自学......现在快一个月了。

public class l2{
public static void main(String[] args){

    char table = {{'A', 'B', 'C', 'D'},{'E', 'F', 'G', 'H'},{'I', 'J', 'K', 'L'},{'M', 'N', 'O', 'P'}};
    final int rowSize = 4;
    final int columnSize = 4;
    String[][] a = new String[rowSize][columnSize];
    // iterate
    for (int row = 0; row < rowSize; row++) {
        for (int column = 0; column < columnSize; column++) {
            a[row][column] = Char.valueOf(ar.charAt(rowSize * row + column));
        }
    }
    // test
    for (int row = 0; row < rowSize; row++) {
        for (int column = 0; column < columnSize; column++) {
            System.out.print(a[row][column] + " ");
        }
        System.out.println();
    }
}
}

错误是：

l2.java:4: error: illegal initializer for char
char table = {{'A', 'B', 'C', 'D'},{'E', 'F', 'G', 'H'},{'I', 'J', 'K', 'L'},{'M', 'N', 'O', 'P'}};

l2.java:7: error: cannot find symbol Char[][] a = new Char[rowSize][columnSize];
^ symbol: class Char location: class l2
l2.java:7: error: cannot find symbol Char[][] a = new Char[rowSize][columnSize];
^ symbol: class Char location: class l2
l2.java:11: error: cannot find symbol a[row][column] = Char.valueOf(ar.charAt(rowSize * row + column));

Answer 1

如果您的目标是在输出中打印 'table A B ...'，您可以这样做：

public class MyClass{

    public static void main(String[] args) {

        char[][] table = {{'A', 'B', 'C', 'D'}, {'E', 'F', 'G', 'H'}, {'I', 'J', 'K', 'L'}, {'M', 'N', 'O', 'P'}};
        final int rowSize = 4;
        final int columnSize = 4;
        
        for (int row = 0; row < rowSize; row++) {
            for (int column = 0; column < columnSize; column++) {
                System.out.print(table[row][column] + " ");
            }
            System.out.println();
        }
    }
}

输出：

A B C D 
E F G H 
I J K L 
M N O P

char 的非法初始值设定项 — 如何修复？

illegal initializer for char — how to fix?

java

type-mismatch

输出：