public class TriangleUtilities {
    public static String getRow(int numberOfStars) {
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < numberOfStars; i += 1){
            builder.append("*");
        }
        return builder.toString();
    }

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

    public static String getSmallTriangle() {
        StringBuilder triangle = new StringBuilder("");
        StringBuilder newRow = new StringBuilder();
        for (int i = 0; i < 4; i += 1){
            newRow.append("*");
            triangle.append(newRow + "\n"); 
        }
        return triangle.toString();
    }

    public static String getLargeTriangle() {
        StringBuilder triangle = new StringBuilder("");
        StringBuilder newRow = new StringBuilder();
        for (int i = 0; i < 9; i += 1){
            newRow.append("*");
            triangle.append(newRow + "\n"); 
        }
        return triangle.toString();
    }
}