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Channel Posts
| 2 | ❓ تفضيل التحويلات في Overload
Overload preference (widening vs boxing vs varargs)static void m(long x){ System.out.print("long"); }
static void m(Integer x){ System.out.print("Integer"); }
static void m(int... x){ System.out.print("varargs"); }
m(5); | 50 |
| 3 | Choose your answer: | 101 |
| 4 | ❓ الاستثناءات المُتَحَقَّقة (Checked)
Checked exceptions handlingvoid read() throws java.io.IOException {}
void m(){ read(); } | 98 |
| 5 | Choose your answer: | 144 |
| 6 | ❓ التعامل مع الاستثناءات في finally
Try-catch-finally ordertry {
int x = 1 / 0;
System.out.print("A");
} catch (ArithmeticException e) {
System.out.print("B");
} finally {
System.out.print("C");
} | 130 |
| 7 | Choose your answer: | 161 |
| 8 | ❓ مستوى الوصول عند إعادة التعريف
Access level when overriding | 140 |
| 9 | Choose your answer: | 201 |
| 10 | ❓ الفرق بين abstract و interface
Abstract class vs interface | 167 |
| 11 | Choose your answer: | 216 |
| 12 | ❓ الوراثة مع مُنشئ أب مُعَلَّم
Inheritance with parameterized base constructorclass Base { Base(int x) {} }
class Child extends Base { } | 193 |
| 13 | Choose your answer: | 243 |
| 14 | ❓ ماذا يطبع جمع عناصر ArrayList؟
What does this ArrayList code print?import java.util.*;
List<Integer> xs = new ArrayList<>();
xs.add(1);
xs.add(2);
System.out.println(xs.get(0) + xs.get(1)); | 228 |
| 15 | Choose your answer: | 227 |
| 16 | ❓ أي عبارة صحيحة عن String و StringBuilder؟
Which is true about String vs StringBuilder? | 213 |
| 17 | Choose your answer: | 249 |
| 18 | ❓ equals مقابل == مع السلاسل
equals vs == with StringsString s1 = new String("java");
String s2 = new String("java");
System.out.println(s1.equals(s2) + "," + (s1 == s2)); | 232 |
| 19 | Choose your answer: | 269 |
| 20 | ❓ instanceof مع الوراثة
instanceof with inheritanceclass A {}
class B extends A {}
A x = new A();
System.out.println(x instanceof B); | 247 |
