CR-MicroLabs-Loops-NumbersTrianglesTables/TableUtilities.java

import java.util.ArrayList;

public class TableUtilities {
    public static String getSmallMultiplicationTable() {
        //String to store the answer
        String answer = "";
        //create an array list to hold all the multiples
        ArrayList<Integer> list = new ArrayList<Integer>();
        //loop through the first numbers being multiplied
        for(int i = 1; i <= 5; i ++)
        {
            //loop through the second numbers being multiplied
            for(int m = 1; m <= 5; m ++)
            {
                //store the product in the array
                int num = i * m;
                list.add(num);
            }
        }
        
        //loop through the array of products
        for(int u = 0; u < list.size(); u++)
        {
            //convert the value of the current iterration to a string
            int num = list.get(u);    
            //get the length of the greatest number in the array
            String greatestNum = String.valueOf(list.get(list.size() - 1));
            int spaces = greatestNum.length() + 1;
            //format the string and add it to the answer
            answer += String.format("%"+ spaces +"s |", num);
            //if the current itteration is the end of the row, start a new row.
            if((u + 1) % 5 == 0)
            {
                answer += "\n";
            }
        }        
        return answer;
    }

    public static String getLargeMultiplicationTable() {
                //String to store the answer
        String answer = "";
        //create an array list to hold all the multiples
        ArrayList<Integer> list = new ArrayList<Integer>();
        //loop through the first numbers being multiplied
        for(int i = 1; i <= 10; i ++)
        {
            //loop through the second numbers being multiplied
            for(int m = 1; m <= 10; m ++)
            {
                //store the product in the array
                int num = i * m;
                list.add(num);
            }
        }
        
        //loop through the array of products
        for(int u = 0; u < list.size(); u++)
        {
            //convert the value of the current iterration to a string
            int num = list.get(u);    
            //get the length of the greatest number in the array
            String greatestNum = String.valueOf(list.get(list.size() - 1));
            int spaces = greatestNum.length();
            //format the string and add it to the answer
            answer += String.format("%"+ spaces +"s |", num);
            //if the current itteration is the end of the row, start a new row.
            if((u + 1) % 10 == 0)
            {
                answer += "\n";
            }
        }        
        return answer;
    }

    public static String getMultiplicationTable(int tableSize) {
        //String to store the answer
        String answer = "";
        //create an array list to hold all the multiples
        ArrayList<Integer> list = new ArrayList<Integer>();
        //loop through the first numbers being multiplied
        for(int i = 1; i <= tableSize; i ++)
        {
            //loop through the second numbers being multiplied
            for(int m = 1; m <= tableSize; m ++)
            {
                //store the product in the array
                int num = i * m;
                list.add(num);
            }
        }
        
        //loop through the array of products
        for(int u = 0; u < list.size(); u++)
        {
            //convert the value of the current iterration to a string
            int num = list.get(u);    
            //get the length of the greatest number in the array
            String greatestNum = String.valueOf(list.get(list.size() - 1));
            int spaces = greatestNum.length();
            //there will always be a minimum of 3 spaces.
            if(spaces < 3){
                spaces = 3;
            }
            //format the string and add it to the answer
            answer += String.format("%"+ spaces +"s |", num);
            //if the current itteration is the end of the row, start a new row.
            if((u + 1) % tableSize == 0)
            {
                answer += "\n";
            }
        }        
        return answer;
    }
    
    public int testStringLen(String test) {
        return test.length();
    }
}