java_二维数组的定义和使用

 
class J_FillArray
 
{
 
    public static void main(String args[]) {
        int[][] matrix = new int[4][5];
        int matrix2[][] = new int[4][5];
        //以上两种定义二维数组的让是都可以;
        for (int row = 0; row < 4; row++) {
            for (int col = 0; col < 5; col++) {
 
                matrix[row][col] = row + col;
            } // 内部for循环结束
        } // 外部for循环结束
 
        for (int row = 0; row < 4; row++) {
            for (int col = 0; col < 5; col++) {
 
                matrix2[row][col] = row + col;
            } // 内部for循环结束
        }
        /*
         * 对于(这个本该定义在公共类红的方法如果定义在main()中儿就会产生类似如下错误: 
         * Syntax error on token "void",
         * record expected void is an invalid type for the variable print Syntax error,
         * insert "}" to complete RecordBody Syntax error on token "}", delete this
         * token;*
         * 
         * public static void print(int [][] matrix_) { for(int row=0;row<4;row++) {
         * for(int col=0;col<5;col++) { System.out.println(matrix_[row][col]); } } }
         */
        print(matrix);
        System.out.println();
        print(matrix2);
 
    } // 方法main结束
 
    public static void print(int[][] matrix_) {
        for (int row = 0; row < 4; row++) {
            for (int col = 0; col < 5; col++) {
                System.out.print(matrix_[row][col]+" ");
            }
            System.out.println();
        }
    }
} // 类J_FillArray结束