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UML class diagram for Point_1D, Point_2D, and Temperature

1. UML class diagram for Point_1D, Point_2D, and Temperature. One method with more than one definitions; can be done in one class or between classes. public class Point_2D extends Point_1D{ private double y ; public Point_2D() { this . y = 0; }

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UML class diagram for Point_1D, Point_2D, and Temperature

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  1. 1 UML class diagram for Point_1D, Point_2D, and Temperature ITK 179

  2. One method with more than one definitions; can be done in one class or between classes. • publicclass Point_2D extends Point_1D{ • privatedoubley; • public Point_2D() { this.y = 0; } • public Point_2D(double x, double y) { • super(x); this.y = y; • } • ……… • ……… • ……… • ……… • publicvoid set(double x, double y) { • set(x); this.y=y; • } • } Overloading: • publicclass Point_1D { • privatedoublex; • ……… • ……… • publicvoid set(double x) { this.x = x; • } • } Overloading ITK 179

  3. Redefined a method in the derived class. • publicclass Point_2D extends Point_1D{ • privatedoubley; • ……… • ……… • publicdouble distance() { • double w = super.distance(); • double h = Math.abs(y-0); • return Math.sqrt(w*w+h*h); • } • publicdouble distance(Point_2D p) { • double w = super.distance(p); • double h = Math.abs(y-p.y); • return Math.sqrt(w*w+h*h); • } • } • publicclass Point_1D { • ……… • publicdouble distance() { • return Math.abs(x); } • publicdouble distance(Point_1D p){ • return Math.abs(x - p.x); • } • } Overriding Overriding: Overloading ITK 179

  4. the default method use identities to do the job. Object’s toString andequals methods • Point_1D@181afa3 • Temperature@131f71a • Point_2D@15601ea Now, we have a better idea about how this job to be done. ITK 179

  5. Using the default toString andequals • Point_1D@181afa3 • Temperature@131f71a • Point_2D@15601ea System.out.println(p1.toString()); System.out.println(t1.toString()); System.out.println(p3.toString()); • Point_2D a = new Point_2D(3,5); • Point_2D b = new Point_2D(3,5); • if (a == b ) • System.out.println("\na == b"); • else • System.out.println("\na != b"); • a != b • if (a.equals(b) ) • System.out.println("\na == b"); • else • System.out.println("\na != b"); • a != b But, we should have a better idea about how these job to be done. ITK 179

  6. publicclass Point_1D { • …… • publicString toString() { • return"Point_1D:"+x; • } • } Overriding toString p1 = new Point_1D(70); p2 = new Point_2D(4,3); T1 = new Temperature(32); System.out.println(p1.toString()); System.out.println(p3.toString()); System.out.println(t1.toString()); • publicclass Point_2D { • …… • publicString toString() { • return"Point_2D:("+get()+“,"+y+")“; • } • } • Point_1D:70.0 • Point_2D:(4.0, 3.0) Temperature:32.0 F • publicclass Temperature { • …… • public String read() { • returnd.get()+" "+Scale; • } • public String toString() { • return"Temperature:"+read(); • } • } ITK 179

  7. publicclass Point_1D { • …… • publicboolean equals(Point_1D p) { • return (p.x == x); • } • } Overloading equals • publicclass Point_2D { • …… • publicboolean equals(Point_2D p) { • return (y == p.y && • super.equals(p)); • } • } • publicclass Temperature { • …… • publicboolean equals(Temperature t) { • return (difference(t) == 0.0); • } • } ITK 179

  8. Point_2D a = new Point_2D(3,5); • Point_2D b = new Point_2D(3,5); • Point_2D c = new Point_2D(5,3); • System.out.print("\n"+a.toString()); • if (a.equals(b)) • System.out.println(" == "+b.toString()); • else • System.out.println(" != "+b.toString()); • System.out.print(a.toString()); • if (a.equals(c)) • System.out.println(" == "+c.toString()); • else • System.out.println(" != "+c.toString()); • t1 = new Temperature(32,'F'); • t2 = new Temperature(0,'F'); • t3 = new Temperature(0,'C'); • System.out.print("\n"+t1.toString()); • if (t1.equals(t2)) • System.out.println(" == "+t2.toString()); • else • System.out.println(" != "+t2.toString()); • System.out.print(t1.toString()); • if (t1.equals(t3)) • System.out.println(" == "+t3.toString()); • else • System.out.println(" != "+t3.toString()); Test Overloaded equals • Point_2D:(3.0, 5.0) == Point_2D:(3.0, 5.0) • Point_2D:(3.0, 5.0) != Point_2D:(5.0, 3.0) • Temperature:32.0 F != Temperature:0.0 F • Temperature:32.0 F == Temperature:0.0 C ITK 179

  9. StringTokenizer class • import java.util.StringTokenizer; • publicstaticvoid testStringTokenizer(String str) { • StringTokenizer oneByOne; • oneByOne = new StringTokenizer(str); • while (oneByOne.hasMoreTokens()) • System.out.println(oneByOne.nextToken()); • } • oneByOne = new StringTokenizer(str, “, “); ITK 179

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