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❓ أي عبارة صحيحة عن String و StringBuilder؟ Which is true about String vs StringBuilder?

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Anonymous Quiz

73%

String is immutable; StringBuilder is mutable

18%

Both are immutable

Both are mutable

❤1

77 voters815 views14:07

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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));

774 viewsedited 14:07

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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));

Choose your answer:

Anonymous Quiz

36%

40%

23%

IndexOutOfBoundsException

77 voters813 views14:07

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❓ الوراثة مع مُنشئ أب مُعَلَّم
Inheritance with parameterized base constructor

class Base { Base(int x) {} }
class Child extends Base { }

738 views14:07

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❓ الوراثة مع مُنشئ أب مُعَلَّم Inheritance with parameterized base constructorclass Base { Base(int x) {} } class Child extends Base { }

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Anonymous Quiz

40%

Compiles successfully

36%

Does not compile: Child must call super(int)

25%

Does not compile: Base needs a no-arg constructor

👍3

53 voters800 views14:07

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❓ الفرق بين abstract و interface
Abstract class vs interface

746 views14:07

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❓ الفرق بين abstract و interface Abstract class vs interface

Choose your answer:

Anonymous Quiz

59%

A class can extend one abstract class and implement multiple interfaces

22%

A class can extend multiple abstract classes

19%

Interfaces cannot have default methods

73 voters798 views14:07

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❓ مستوى الوصول عند إعادة التعريف
Access level when overriding

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❓ مستوى الوصول عند إعادة التعريف Access level when overriding

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Anonymous Quiz

26%

A subclass may widen access (e.g., protected -> public)

52%

A subclass may narrow access (e.g., public -> protected)

22%

Access level must always be identical and cannot widen

58 voters801 views14:07

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❓ التعامل مع الاستثناءات في finally
Try-catch-finally order

try {
  int x = 1 / 0;
  System.out.print("A");
} catch (ArithmeticException e) {
  System.out.print("B");
} finally {
  System.out.print("C");
}

743 views14:07

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❓ 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"); }

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Anonymous Quiz

80 voters779 views14:07

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❓ الاستثناءات المُتَحَقَّقة (Checked)
Checked exceptions handling

void read() throws java.io.IOException {}
void m(){ read(); }

756 views14:07

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❓ الاستثناءات المُتَحَقَّقة (Checked) Checked exceptions handlingvoid read() throws java.io.IOException {} void m(){ read(); }

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Anonymous Quiz

36%

Compiles: unchecked exceptions only

50%

Does not compile: must handle or declare the checked exception

14%

Runtime error only

50 voters809 views14:07

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❓ 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);

849 views14:07

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❓ 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);

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Anonymous Quiz

❤1👍1

81 voters970 views14:07

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حسابي الخاص باستقبال المشاريع سوى مواقع او بوتات وغيرها
t.me/best_coding

1.01K views12:40

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جافا Java pinned «حسابي الخاص باستقبال المشاريع سوى مواقع او بوتات وغيرها t.me/best_coding»

12:41

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❓ ترتيب التهيئة: static ثم instance ثم constructor
Initialization order

class X {
  static { System.out.print("S"); }
  { System.out.print("I"); }
  X(){ System.out.print("C"); }
}
new X();

908 views14:07

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❓ ترتيب التهيئة: static ثم instance ثم constructor Initialization orderclass X { static { System.out.print("S"); } { System.out.print("I"); } X(){ System.out.print("C"); } } new X();

Choose your answer:

Anonymous Quiz

❤1

70 voters842 views14:07

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❓ إخفاء الحقول (Field Hiding)
Field hiding resolution

class A { int v = 1; }
class B extends A { int v = 2; }
B b = new B();
System.out.println(((A)b).v);

730 viewsedited 14:07

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