CR-MicroLabs-Loops-NumbersTrianglesTables/TableUtilities.java

import java.lang.StringBuilder;

public class TableUtilities {
    public static String getSmallMultiplicationTable() {
        
        StringBuilder sb = new StringBuilder();
        
        for (int i = 1; i < 6; i++) {
            for (int j = 1; j < 6; j++) {
                int product = i*j;
                sb.append(" ");
                if (product < 10) {
                    sb.append(" ");
                }
                sb.append(product + " |");
            }
            sb.append("\n");
        }
        return sb.toString();
    }

    public static String getLargeMultiplicationTable() {
        
        StringBuilder sb = new StringBuilder();
        
        for (int i = 1; i < 11; i++) {
            for (int j = 1; j < 11; j++) {
                int product = i*j;
                sb.append(" ");
                if (product < 10) {
                    sb.append(" ");
                } else if (product > 99) {
                    sb.deleteCharAt(sb.length() - 1);
                }
                sb.append(product + " |");
            }
            sb.append("\n");
        }
        System.out.println(sb.toString());
        return sb.toString();
    }

    public static String getMultiplicationTable(int tableSize) {
        
        StringBuilder sb = new StringBuilder();
        
        for (int i = 1; i < tableSize + 1; i++) {
            for (int j = 1; j < tableSize + 1; j++) {
                int product = i*j;
                sb.append(" ");
                if (product < 10) {
                    sb.append(" ");
                } else if (product > 99) {
                    sb.deleteCharAt(sb.length() - 1);
                }
                sb.append(product + " |");
            }
            sb.append("\n");
        }
        System.out.println(sb.toString());
        return sb.toString();
    }
}