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| 1 | +ex1 -> Class b - בגלל מנגנון ה - polymorphism |
| 2 | +ex2 -> public void method1(float y) |
| 3 | +ex3 -> אם הרשאת הגישה לשיטה f שבמחלקה A היא protected והרשאת הגישה לשיטה f שבמחלקה B היא private. |
| 4 | +ex4 ->המחלקות Computer ו-TV יורשות מהמחלקה ElectronicDevice והמחלקה Laptop יורשת מהמחלקה |
| 5 | +ex5 -> הפלט יהיה: B |
| 6 | +ex6 -> המחלקה A מכילה שיטה בשם f שאינה מקבלת פרמטרים. |
| 7 | +ex7 -> שגיאת קומפליציה |
| 8 | +ex8 -> שגיאת זמן ריצה |
| 9 | +ex12 -> על הפלט יודפס dd |
| 10 | +ex13 -> שגיאת קומפליציה |
| 11 | +ex14 -> על הפלט יודפס 3 ובשורה שאחריה יודפס 10 |
| 12 | +ex15 -> שגיאת קומפליציה |
| 13 | +ex16 -> על הפלט יודפס 1 |
| 14 | +ex17 -> Card |
| 15 | +ex18 -> כל קטע קוד הנכתב באחת מן המחלקות היורשות זמין באופן מיידי במחלקה - האם ובכל אחיותיה בעת הירושה |
| 16 | +ex19 -> המחלקות poodle , dalmation יורשות מהמחלקה dog והמחלקות dog and cat יורשות מהמחלקה mammal |
| 17 | +ex20 -> כל התשובות האחרות אינן נכונות |
| 18 | + |
| 19 | +public class ClassA |
| 20 | +{ |
| 21 | + public ClassA() |
| 22 | + { |
| 23 | + f(); |
| 24 | + }// end of method ClassA |
| 25 | + |
| 26 | + public void f() |
| 27 | + { |
| 28 | + System.out.println("Class a"); |
| 29 | + }// end of method f |
| 30 | + |
| 31 | + public static void main(String[] args) |
| 32 | + { |
| 33 | + new ClassB(); |
| 34 | + }// end of method main |
| 35 | +}// end of class ClassA |
| 36 | + |
| 37 | + |
| 38 | +public class ClassB extends ClassA |
| 39 | + |
| 40 | +{ |
| 41 | + |
| 42 | + public ClassB() {} |
| 43 | + |
| 44 | + |
| 45 | + |
| 46 | + public void f() |
| 47 | + |
| 48 | + { |
| 49 | + |
| 50 | + System.out.println("Class b"); |
| 51 | + |
| 52 | + } |
| 53 | + |
| 54 | +} |
| 55 | + |
| 56 | +public class A { |
| 57 | + |
| 58 | + public void method1(float x){ … } |
| 59 | + |
| 60 | +} |
| 61 | + |
| 62 | +public class A |
| 63 | +{ |
| 64 | + public void a1() |
| 65 | + { |
| 66 | + System.out.println("A"); |
| 67 | + }// end of method a1 |
| 68 | + |
| 69 | + public void a2() |
| 70 | + { |
| 71 | + a1(); |
| 72 | + }// end of method a2 |
| 73 | +}// end of class A |
| 74 | + |
| 75 | + |
| 76 | + |
| 77 | +public class B extends A |
| 78 | +{ |
| 79 | + @Override |
| 80 | + public void a1() |
| 81 | + { |
| 82 | + System.out.println("B"); |
| 83 | + }// end of method a1 |
| 84 | +}// end of class B |
| 85 | + |
| 86 | + |
| 87 | +public class C |
| 88 | +{ |
| 89 | + public void foo(D d) |
| 90 | + { |
| 91 | + System.out.println("cd"); |
| 92 | + } |
| 93 | +}// end of class C |
| 94 | + |
| 95 | + |
| 96 | + |
| 97 | + |
| 98 | +public class D extends C |
| 99 | +{ |
| 100 | + public void foo(C c) |
| 101 | + { |
| 102 | + System.out.println("dc"); |
| 103 | + }// end of methdo foo |
| 104 | + |
| 105 | + public void foo(D d) |
| 106 | + { |
| 107 | + System.out.println("dd"); |
| 108 | + } |
| 109 | + |
| 110 | +}// end of method class D |
| 111 | + |
| 112 | + |
| 113 | +public class A |
| 114 | +{ |
| 115 | + public void doSomething(int x) |
| 116 | + { |
| 117 | + System.out.println("1"); |
| 118 | + }// end of method doSomething |
| 119 | + |
| 120 | + public void doSomethingElse(int x, int y) |
| 121 | + { |
| 122 | + System.out.println("2"); |
| 123 | + }// end of method doSomethingElse |
| 124 | + |
| 125 | + public int calc (int x) |
| 126 | + { |
| 127 | + System.out.println("3"); |
| 128 | + return x + 1; |
| 129 | + }// end of method calc |
| 130 | + |
| 131 | +}// end of class A |
| 132 | + |
| 133 | + |
| 134 | +public class B extends A |
| 135 | +{ |
| 136 | + public void doSomethingElse(int x) |
| 137 | + { |
| 138 | + System.out.println("4"); |
| 139 | + }// end of method doSomethingElse |
| 140 | +}// end of class B |
| 141 | + |
| 142 | + |
| 143 | +public class D extends A |
| 144 | +{ |
| 145 | + public void calc(int x, int y) |
| 146 | + { |
| 147 | + System.out.println(7+y+x); |
| 148 | + }// end of method calc |
| 149 | +}// end of class D |
| 150 | + |
| 151 | + |
| 152 | +public class C extends A |
| 153 | +{ |
| 154 | + public void doSomething(int x) |
| 155 | + { |
| 156 | + System.out.println("5"); |
| 157 | + }// end of method doSomething |
| 158 | +}// end of class C |
| 159 | + |
| 160 | + |
| 161 | +public class E extends C |
| 162 | +{ |
| 163 | + public int calc(int x) |
| 164 | + { |
| 165 | + System.out.println("8"); |
| 166 | + return x + 3; |
| 167 | + }// end of method calc |
| 168 | +}// end of class E |
| 169 | + |
| 170 | +public abstract class A |
| 171 | +{ |
| 172 | + public abstract boolean f(int x); |
| 173 | +}// end of abstract class A |
| 174 | + |
| 175 | + |
| 176 | +public abstract class B extends A |
| 177 | +{ |
| 178 | + public boolean f(int x) |
| 179 | + { |
| 180 | + return x == 2; |
| 181 | + } |
| 182 | +}// end of abstract class B |
| 183 | + |
| 184 | +public class A |
| 185 | +{ |
| 186 | + private int _x; |
| 187 | + public A(int x) |
| 188 | + { |
| 189 | + _x = x; |
| 190 | + }// end of method A |
| 191 | + |
| 192 | + public int getX() |
| 193 | + { |
| 194 | + return _x; |
| 195 | + }// end of method getX |
| 196 | + |
| 197 | + public int doubleX() |
| 198 | + { |
| 199 | + return 2 * getX(); |
| 200 | + }// end of method doubleX |
| 201 | + |
| 202 | + public int tripleX() |
| 203 | + { |
| 204 | + return 3 * _x; |
| 205 | + }// end of method tripleX |
| 206 | + |
| 207 | + public int subXhelper() |
| 208 | + { |
| 209 | + return _x -1; |
| 210 | + }// end of method subXhelper |
| 211 | + |
| 212 | + public int subX() |
| 213 | + { |
| 214 | + return subXhelper(); |
| 215 | + }// end of method subX |
| 216 | +}// end of class A |
| 217 | + |
| 218 | +public class B extends A |
| 219 | +{ |
| 220 | + private int _x; |
| 221 | + |
| 222 | + public B(int xA, int xB) |
| 223 | + { |
| 224 | + super(xA); |
| 225 | + _x = xB; |
| 226 | + }// end of method B |
| 227 | + |
| 228 | + public int getX() |
| 229 | + { |
| 230 | + return _x; |
| 231 | + }// end of method getX |
| 232 | + |
| 233 | + public int superX() |
| 234 | + { |
| 235 | + return super.getX(); |
| 236 | + }// end of method superX |
| 237 | + |
| 238 | + public int tenTimesX() |
| 239 | + { |
| 240 | + return 10 * _x; |
| 241 | + }// end of method tenTimesX |
| 242 | + |
| 243 | + public int subXhelper() |
| 244 | + { |
| 245 | + return _x * 2; |
| 246 | + }// end of method subXhelper |
| 247 | +}// end of class B |
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