我的代码需要将数组的每一行乘以下一行的每一列。用户输入高度和宽度，程序将随机生成数组值。如果数组相等，例如 (3x3) (3x3) 或者即使您这样做 (3x2) (2x3)，它也不会给出任何错误。但是，如果您输入类似 (3x3)(3x2) 的内容，则会出现越界异常。
public class Multiply {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int width = -1;
int height = 0;
int width2 = 0;
int height2 = 0;
while (width != height2) {
while (height <= 0) {
System.out.print("Enter a height for array1: ");
height = checkInt(scan);
}
while (width <= 0) {
System.out.print("Enter a width for array1: ");
width = checkInt(scan);
}
while (height2 <= 0) {
System.out.print("Enter a height for array2: ");
height2 = checkInt(scan);
}
while (width2 <= 0) {
System.out.print("Enter a width for array2: ");
width2 = checkInt(scan);
}
if (width != height2) {
System.out
.println("Error! Dimensions of matrices not compatible. Try again.");
width = -1;
height = 0;
width2 = 0;
height2 = 0;
}
}
int array1[][] = randomMatrix(height, width);
int array2[][] = randomMatrix(height2, width2);
int product[][] = matrixMultiply(array1, array2, height, width2);
printArray(product);
}// end of main method
public static int[][] randomMatrix(int height, int width) {
int array1[][] = new int[height][width];
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
array1[i][j] = (int) (-10 + Math.random() * 20);
}
}
return array1;
}// end of randomMatrix method
public static int[][] matrixMultiply(int[][] array1, int[][] array2, int height, int width) {
int[][] product = new int[height][width];
for (int i = 0; i < array1.length; i++) {
for (int j = 0; j < array1[i].length; j++) {
int prod = 0;
for (int k = 0; k < array2.length; k++) {
prod = prod + array1[i][k] * array2[k][j];
}
product[i][j] = prod;
}
}
return product;
}// end of matrixMultiply method
public static void printArray(int[][] array) {
System.out.println(" ");
System.out.println("Row Major Representation:");
for (int i = 0; i < array.length; i++) {
for (int j = 0; j < array[i].length; j++) {
System.out.print(array[i][j] + " ");
}
System.out.println();
}
System.out.println(" ");
System.out.println("Column Major Representation:");
for (int i = 0; i < array[1].length; i++) {
for (int j = 0; j < array.length; j++) {
System.out.print(array[j][i] + " ");
}
System.out.println();
}
}
public static int checkInt(Scanner scan) {
int width = 0;
if (scan.hasNextInt()) {
width = scan.nextInt();
return width;
} else {
scan.next();
return 0;
}
}
}// end of public class Multiply