public class TriangleUtilities {

    public static String getRow(int numberOfStars) {
        StringBuilder stars = new StringBuilder();
        for(int i=0; i<numberOfStars; i++){
            stars.append("*");
        }
        return stars.toString();
    }
    
    public static String getTriangle(int numberOfRows) {
        StringBuilder stars = new StringBuilder();
        for(int i = 1; i < (numberOfRows + 1); i++){
           for (int j = 0; j < i; j++) {
            stars.append("*");
           }
           stars.append("\n");
        }
        return stars.toString();
    }


    public static String getSmallTriangle() {
        StringBuilder stars = new StringBuilder();
        for(int i = 1; i < 5; i++){
           for (int j = 0; j < i; j++) {
            stars.append("*");
           }
           stars.append("\n");
        }
        return stars.toString();
    }

    public static String getLargeTriangle() {
        StringBuilder stars = new StringBuilder();
        for(int i = 1; i < 10; i++){
           for (int j = 0; j < i; j++) {
            stars.append("*");
           }
           stars.append("\n");
        }
        return stars.toString();
    }
}