Thread: multiplication table java 2D array

Hello fellow Java-Members!

I am currently trying to solve the following problem, but I’ve been stuck in the last 2-3 days.

Problem:

Implement a method

 int[][] getMultiplicationTables(int from, int to)

, which returns a 2D Array containing the results of the multiplicaton of all numbers for "int from - int to".

Also, the values of the array should be displayed in columns in the console.


What I’ve got so far is this:

public class MultiplicationTables {
 
	public void printTables(int from, int to) {
		for(int i = from; i < to; i++) {
			for(int j = from; j <= 10; j++) {
				System.out.println(i * j);
			}
		}		
	}
}

I just have no idea how to solve this with a 2D Array :/

int from and int to are indexes? Where does your Array come from? Seems like your method shouldn't only take the indexes, but also the array.
You could do something like:

public class MultiplicationTables {
    public void printTables(int from, int to, int [][] yourArray) {
        for(int i = from; i < to; i++) {
	    for(int j = from; j <= 10; j++) {
	        System.out.println(yourArray[i][0] *yourArray[0][j]);
	    }
            System.out.println();
        }		
    }
}