How can i make the Matrix of strings MxN using Scanner in Java?

Question

I want to make a matrix which has M rows and N columns using the scanner.
If i try to do it this way:

Scanner input = new Scanner(System.in);
int m=input.nextInt();
int n=input.nextInt();
String[][] matrix = new String[m][n];
for(int i=0;i<m;i++){
  for(int j=0;j<n;j++){
   matrix [i][j] = input.nextLine();
  }
}

It won't work.

How can i make this work?
Simple example of a matrix i want:

3 4
* * * *
* * * *
* * * *

Does this answer your question? [Scanner is skipping nextLine() after using next() or nextFoo()?](https://stackoverflow.com/questions/13102045/scanner-is-skipping-nextline-after-using-next-or-nextfoo) — Majed Badawi, Jun 13 '21 at 20:07
It doesn't i am pretty new to Java, i need a simpler answer. — CupidONO, Jun 13 '21 at 20:11
You need to explain the problem your facing by providing more details. — Majed Badawi, Jun 13 '21 at 20:12
I assume there is enough detail in the code i have given which won't work? — CupidONO, Jun 13 '21 at 20:15

score 1 · Accepted Answer · answered Jun 13 '21 at 20:25

You need to add this code line: input.nextLine(); directly under your int n=input.nextInt(); line of code so as to consume the newline character still contained within the Scanner buffer when the ENTER key was hit from the last .nextInt() method otherwise the following .nextLine() method will consume it and take it as input giving the effect that is was skipped over.

For example:

Scanner input = new Scanner(System.in);
int m = input.nextInt();
int n = input.nextInt();
input.nextLine();
String[][] matrix = new String[m][n];
for (int i = 0; i < m; i++) {
    for (int j = 0; j < n; j++) {
        matrix[i][j] = input.nextLine();
    }
}
    
for (int i = 0; i < matrix.length; i++) {
    System.out.println(Arrays.toString(matrix[i]));
}

One thing, it doesn't recognize Arrays.ToString for some reason? — CupidONO, Jun 13 '21 at 20:40

How can i make the Matrix of strings MxN using Scanner in Java?

1 Answers1