Ruby and Java Programming Reflection Exercises

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Dive into reflective exercises in Ruby and Java programming languages, exploring inheritance, subclassing, and generic types. Test your skills with hands-on coding challenges and understand the nuances of object-oriented programming through practical examples.

  • Ruby
  • Java
  • Programming
  • Reflection
  • Inheritance
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  1. Section 9: Ruby and Java 11-19-2015

  2. Ruby Reflection Exercise class C1 class C2 < C1 What is the result of: def test include M1 1) c1.test "C1 test " + animal end 2) c2.test end class C3 < C1 3) c3.test include M1, M2 4) c4.test def animal end 5) C4.superclass "squid" 6) C4.ancestors end class C4 < C2 7) C4.class end def test 8) C4.class.class "C4 test " + super module M1 end def test "M1 test " + super def animal end "octopus" end end end module M2 def test c1 = C1.new "M2 test " + super c2 = C2.new end c3 = C3.new end c4 = C4.new

  3. Ruby Reflection Exercise class C1 class C2 < C1 What is the result of: def test include M1 1) c1.test C1 test squid "C1 test " + animal end 2) c2.test M1 test C1 test squid end class C3 < C1 include M1, M2 3) c3.test M1 test M2 test C1 test squid def animal end "squid" end class C4 < C2 4) c4.test "C4 test M1 test C1 test octopus" end def test "C4 test " + super 5) C4.superclass C2 module M1 end def test 6) C4.ancestors [C4, C2, M1, C1, Object, Kernel, BasicObject] "M1 test " + super def animal end "octopus" 7) C4.class Class end end end 8) C4.class.class Class module M2 def test c1 = C1.new "M2 test " + super c2 = C2.new end c3 = C3.new end c4 = C4.new

  4. Java Generics Exercise Does the following code compile correctly? Does it execute without errors? Hint: Ellipse2D.Double is a subclass of Ellipse Rectangle2D.Double is a subclass of Rectangle Ellipse2D and Rectangle2D are subclasses of RectangularShape RectangularShape r = new Rectangle2D.Double(0.0, 0.0, 50.0, 100.0); Ellipse2D[] a1 = new Ellipse2D[100]; RectangularShape[] a2; a2 = a1; a2[0] = r;

  5. Java Generics Exercise Does the following code compile correctly? Does it execute without errors? Hint: Ellipse2D.Double is a subclass of Ellipse Rectangle2D.Double is a subclass of Rectangle Ellipse2D and Rectangle2D are subclasses of RectangularShape RectangularShape r = new Rectangle2D.Double(0.0, 0.0, 50.0, 100.0); Ellipse2D[] a1 = new Ellipse2D[100]; RectangularShape[] a2; a2 = a1; a2[0] = r; Runtime Exception

  6. Java Generics Exercise Does the following code compile correctly? Does it execute without errors? Hint: Ellipse2D.Double is a subclass of Ellipse Rectangle2D.Double is a subclass of Rectangle Ellipse2D and Rectangle2D are subclasses of RectangularShape RectangularShape r = new Rectangle2D.Double(0.0, 0.0, 50.0, 100.0); Ellipse2D[] a1 = new Ellipse2D[100]; RectangularShape[] a2; a2 = a1; a1[0] = r;

  7. Java Generics Exercise Does the following code compile correctly? Does it execute without errors? Hint: Ellipse2D.Double is a subclass of Ellipse Rectangle2D.Double is a subclass of Rectangle Ellipse2D and Rectangle2D are subclasses of RectangularShape RectangularShape r = new Rectangle2D.Double(0.0, 0.0, 50.0, 100.0); Ellipse2D[] a1 = new Ellipse2D[100]; RectangularShape[] a2; a2 = a1; a1[0] = r; Compiletime Error

  8. Java Generics Exercise Does the following code compile correctly? Does it execute without errors? Hint: Ellipse2D.Double is a subclass of Ellipse Rectangle2D.Double is a subclass of Rectangle Ellipse2D and Rectangle2D are subclasses of RectangularShape RectangularShape r = new Rectangle2D.Double(0.0, 0.0, 50.0, 100.0); Rectangle2D[] a1 = new Rectangle2D[100]; RectangularShape[] a2; a2 = a1; a2[0] = r;

  9. Java Generics Exercise Does the following code compile correctly? Does it execute without errors? Hint: Ellipse2D.Double is a subclass of Ellipse Rectangle2D.Double is a subclass of Rectangle Ellipse2D and Rectangle2D are subclasses of RectangularShape RectangularShape r = new Rectangle2D.Double(0.0, 0.0, 50.0, 100.0); Rectangle2D[] a1 = new Rectangle2D[100]; RectangularShape[] a2; a2 = a1; a2[0] = r; Executes

  10. Java Code Exercise For each of the following: Does it compile? If not, which lines are responsible and what are the errors? What is the program output? Is there a runtime exception? If there is a runtime exception, what is the output up to that point?

  11. Java Code Exercise class Test1 { public static void main(String[] args) { String[] a; Object[] b; a = new String[5]; b = a; a[0] = "oyster"; test(a,1); test(b,2); test( (Object[]) a, 3); test( (String[]) b, 4); public static void test(Object[] c, int i) { for(int i = 0; i<a.length; i++) { c[i] = "clam"; System.out.print(a[i]); } System.out.print(" "); } public static void test(String[] c, int i) { System.out.print("\n"); c[i] = "squid"; } } }

  12. Java Code Exercise class Test1 { public static void main(String[] args) { String[] a; Object[] b; a = new String[5]; oyster squid clam clam squid b = a; a[0] = "oyster"; test(a,1); test(b,2); test( (Object[]) a, 3); test( (String[]) b, 4); public static void test(Object[] c, int i) { for(int i = 0; i<a.length; i++) { c[i] = "clam"; System.out.print(a[i]); } System.out.print(" "); } public static void test(String[] c, int i) { System.out.print("\n"); c[i] = "squid"; } } }

  13. Java Code Exercise import java.util.LinkedList; class Test2 { public static void main(String[] args) { LinkedList<String> a; LinkedList<Object> b; a = new LinkedList<String>(); b = a; a.addFirst("oyster"); public static void test(LinkedList<Object> c, test(a,1); int i) { test(b,2); c.add(i,"clam"); for (String s : a) { } System.out.print(s); System.out.print(" "); public static void test(LinkedList<String> c, } int i) { System.out.print("\n"); c.add(i,"clam"); } } }

  14. Java Code Exercise import java.util.LinkedList; class Test2 { 3 Errors: public static void main(String[] args) { LinkedList<String> a; LinkedList<Object> b; a = new LinkedList<String>(); Incompatible types b = a; a.addFirst("oyster"); public static void test(LinkedList<Object> c, test(a,1); Cannot apply int i) { test(b,2); c.add(i,"clam"); for (String s : a) { } System.out.print(s); System.out.print(" "); public static void test(LinkedList<String> c, } Already int i) { System.out.print("\n"); c.add(i,"clam"); defined } } }

  15. Java Code Exercise class Test3 { public static void main(String[] args) { String[] a; Object[] b; a = new String[2]; b = a; a[0] = "oyster"; System.out.println("added an oyster"); b[1] = new Integer(5); System.out.println("added an integer"); for(int i = 0; i<a.length; i++) { System.out.print(a[i]); System.out.print(" "); } System.out.print("\n"); } }

  16. Java Code Exercise class Test3 { public static void main(String[] args) { String[] a; Object[] b; a = new String[2]; b = a; a[0] = "oyster"; added an oyster System.out.println("added an oyster"); b[1] = new Integer(5); Runtime exception. System.out.println("added an integer"); for(int i = 0; i<a.length; i++) { System.out.print(a[i]); System.out.print(" "); } System.out.print("\n"); } }

  17. Questions?

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