如何用 Java 从用户那里读取矩阵？
给定的任务是从用户那里读取矩阵。矩阵元素的大小和数量将从键盘上读取。
// Java program to read a matrix from user
import java.util.Scanner;
public class MatrixFromUser {
// Function to read matrix
public static void readMatrixByUser()
{
int m, n, i, j;
Scanner in = null;
try {
in = new Scanner(System.in);
System.out.println("Enter the number "
+ "of rows of the matrix");
m = in.nextInt();
System.out.println("Enter the number "
+ "of columns of the matrix");
n = in.nextInt();
// Declare the matrix
int first[][] = new int[m][n];
// Read the matrix values
System.out.println("Enter the elements of the matrix");
for (i = 0; i < m; i++)
for (j = 0; j < n; j++)
first[i][j] = in.nextInt();
// Display the elements of the matrix
System.out.println("Elements of the matrix are");
for (i = 0; i < m; i++) {
for (j = 0; j < n; j++)
System.out.print(first[i][j] + " ");
System.out.println();
}
}
catch (Exception e) {
}
finally {
in.close();
}
}
// Driver code
public static void main(String[] args)
{
readMatrixByUser();
}
}
Output:
Enter the number of rows of the matrix 2
Enter the number of columns of the matrix 2
Enter the elements of the matrix
1
2
3
4
Elements of the matrix are
1 2
3 4
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