Program To Create Patterns of Various Kinds Using Java Programming Language Assignment Solution

Instructions

Write a Java assignment program to create patterns of various kinds using the programming language.

Requirements and Specifications

Here in this program, we are going to create patterns of various kinds using different signs and characters.

DRAW public class Draw { public static String boxes(int height, int width, char c1, char c2) { // checking arguments if (height < 7 || height > 20 || width < 7 || width > 20) { throw new IllegalArgumentException(); } // creating char array representing final picture char[][] arr = new char[height][width]; int currHeight = height; int currWidth = width; int step = 0; // drawing frame by frame, until fram size is positive while (currHeight > 0 && currWidth > 0) { // choosing character according to step parity char c = step % 2 == 0 ? c1 : c2; // drawing horizontal lines for (int i = 0; i < currWidth; i++) { arr[step][step + i] = c; arr[step + currHeight - 1][step + i] = c; } // drawing vertical lines for (int i = 0; i < currHeight; i++) { arr[step + i][step] = c; arr[step + i][step + currWidth - 1] = c; } // next frame will have smaller size currHeight -= 2; currWidth -= 2; step++; } return createString(arr, height, width); } public static String stripes(int height, int width, char c1, char c2, boolean isHorizontal) { // validating arguments if (height < 5 || height > 25 || width < 5 || width > 25) { throw new IllegalArgumentException(); } if (isHorizontal && height % 3 != 0) { throw new IllegalArgumentException(); } if (!isHorizontal && width % 3 != 0) { throw new IllegalArgumentException(); } // creating char array representing final picture char[][] arr = new char[height][width]; // filling each cell of it for (int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { // calculating necessary symbol if (isHorizontal) { arr[i][j] = (i / (height / 3) == 1) ? c2 : c1; } else { arr[i][j] = (j / (width / 3) == 1) ? c2 : c1; } } } return createString(arr, height, width); } private static String createString(char[][] arr, int height, int width) { // creating final String using StringBuilder StringBuilder builder = new StringBuilder(); for (int i = 0; i < height; i++) { // adding next char array row to string builder.append(new String(arr[i])); if (i < height - 1) { // if row is not last, adding \n builder.append("\n"); } } // returning result return builder.toString(); } } TEST QUESTION import static org.junit.jupiter.api.Assertions.*; import org.junit.Test; public class TestsQuestionThree { @Test public void testPartA() { try { Draw.class.getDeclaredMethod("boxes", int.class, int.class, char.class, char.class); } catch (NoSuchMethodException ex) { fail("boxes method signature incorrect"); } try { Draw.class.getDeclaredMethod("stripes", int.class, int.class, char.class, char.class, boolean.class); } catch (NoSuchMethodException ex) { fail("stripes method signature incorrect"); } try { Draw.boxes(-1, -1, 'x', 'o'); fail("Boxes: invalid input"); } catch (Exception ex) {} try { Draw.stripes(-1, -1, 'x', 'o', false); fail("Stripes: invalid input"); } catch (Exception ex) {} } @Test public void testPartB() { //example 1 String s = Draw.boxes(7,7,'+', 'o'); String answer = "+++++++\n" + "+ooooo+\n" + "+o+++o+\n" + "+o+o+o+\n" + "+o+++o+\n" + "+ooooo+\n" + "+++++++"; assertEquals(answer, s); //example 2 s = Draw.boxes(8,15,'|', '*'); answer = "|||||||||||||||\n" + "|*************|\n" + "|*|||||||||||*|\n" + "|*|*********|*|\n" + "|*|*********|*|\n" + "|*|||||||||||*|\n" + "|*************|\n" + "|||||||||||||||"; assertEquals(answer, s); } @Test public void testPartC() { String s = Draw.stripes(5, 15,'+', 'o', false); String answer = "+++++ooooo+++++\n" + "+++++ooooo+++++\n" + "+++++ooooo+++++\n" + "+++++ooooo+++++\n" + "+++++ooooo+++++"; assertEquals(answer, s); s = Draw.stripes(9,15,'-', '|', true); answer = "---------------\n" + "---------------\n" + "---------------\n" + "|||||||||||||||\n" + "|||||||||||||||\n" + "|||||||||||||||\n" + "---------------\n" + "---------------\n" + "---------------"; assertEquals(answer, s); } }