# Information about the pattern the gap between each

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Information about the pattern: The gap between each filled square in all the rows is given by the constant, GAP . The gap between each row is given by the constant, GAP . The left position of the first filled square in each row is given by the constant, GAP . The size of each filled square is given by the constant, SIZE . Each row contains one filled square less than the row above it. The filled squares are all drawn in black. Adding an instance of the Q9JPanel (with the completed drawPattern() method) to a JFrame produces the following JFrame. The output JFrame shown below is obtained by making the call: drawPattern (g, 9, 4); to the drawPattern () method. The output JFrame shown below is obtained by making the call: drawPattern (g, 7, 2); to the drawPattern () method.

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Question/Answer Sheet - Page 22 - CompSci 101 SS C SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED import java.awt.*; import javax.swing.*; public class Q9JPanel extends JPanel{ public void paintComponent(Graphics g){ super.paintComponent(g); drawPattern(g, 11, 5); } private void drawPattern(Graphics g, int numFirst, int numLines){ final int SIZE = 30; // size of each filled square final int GAP = SIZE/2; // gap between squares int numInRow = numFirst; int y = GAP; int x; for(int row=0; row<numLines; row++) { x = GAP; for(int col=0; col<numInRow; col++) { g.fillRect(x, y, SIZE, SIZE); x += GAP + SIZE; } y += GAP + SIZE; numInRow--; } } } (8 marks)
Question/Answer Sheet - Page 23 - CompSci 101 SS C SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Question 10 (8 marks) Consider the Meddle class which is defined below: public class Meddle { private static int number; private int num; public Meddle(int n){ num = n; number = number - num; } public void change(int n){ num = num + n; number = number + num; } public String toString(){ return "number: "+number + ", num: " + num; } public static void setNumber(int newN){ number = newN; } } The application Q10 below uses the Meddle class: public class Q10 { public static void main(String[] args) { Meddle.setNumber(20); Meddle a = new Meddle(3); a.change(4); System.out.println("1. a: "+ a.toString()); Meddle b = new Meddle(5); System.out.println("2. b: "+ b.toString()); a.change(4); System.out.println("3. b: "+ b.toString()); } }

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Question/Answer Sheet - Page 24 - CompSci 101 SS C SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Show the output when the Q10 application is executed: > java Q10 1. a: number: 24, num: 7 2. b: number: 19, num: 5 3. b: number: 30, num: 5 (8 marks)
Question/Answer Sheet - Page 25 - CompSci 101 SS C SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Question 11 (10 marks) What is the output when the Q11 application shown below is executed? public class Q11 { public static void main(String[] args) { String str = "OKAY"; if (method1(str)) str = method2(str, 1); else str = method2(str, 2); System.out.println("1. " + str); str = "2"; method3(str, 5); } private static boolean method1(String s){ int num = s.length(); System.out.println("2. " + s); if (num%2 == 0) return true; return false; } private static String method2(String s, int num1){ int num2 = s.length(); int pos = num2 - num1; System.out.println("3. " + pos); return s.substring(0, pos); } private static void method3(String s, int num){ System.out.println("4. " + s); String str = s + num; System.out.println("5. " + method4(str)); } private static int method4(String s){ System.out.println("6. " + s); int num = Integer.parseInt(s); return num-1; } }

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