جافا Java
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In Java, what is a 'package' and how is it used?

في جافا، ما هو 'الحزمة' وكيف يتم استخدامها؟
What is the output of the following Java code?
```java
System.out.println(10 > 9); ```
Anonymous Quiz
76%
true
13%
false
8%
1
3%
0
Consider the following Java code snippet. What will be the output?

class Base {
void display() {
System.out.println("Base display()");
}
}
class Derived extends Base {
void display() {
System.out.println("Derived display()");
}
}
public class Test {
public static void main(String[] args) {
Base obj = new Derived();
obj.display();
}
}



فكر في الشفرة البرمجية جافا التالية. ماذا سيكون المخرج؟
Which of the following is not a valid way to create an instance of a class named `MyClass` in Java?
Anonymous Quiz
45%
MyClass obj = new MyClass();
14%
new MyClass();
17%
MyClass obj = MyClass();
3
What is the output of the following Java code snippet demonstrating the concept of method overriding?

class Vehicle {
void run() {
System.out.println("Vehicle is running");
}
}
class Bike extends Vehicle {
void run() {
System.out.println("Bike is running safely");
}
}
public class Test {
public static void main(String[] args) {
Bike obj = new Bike();
obj.run();
}
}



ما هو مخرج الشفرة البرمجية جافا التالية التي توضح مفهوم إعادة تعريف الطريقة؟
👍21
Which of the following is not OOPS concept in Java?
Anonymous Quiz
70%
Compilation
15%
Polymorphism
7%
Inheritance
8%
Encapsulation
Which concept of Java is a way of converting real world objects in terms of class?
Anonymous Quiz
27%
Inheritance
27%
Encapsulation
26%
Abstraction
19%
Polymorphism
Which of the following is a valid declaration of an object of class Box?
Anonymous Quiz
7%
new Box obj;
75%
Box obj = new Box();
7%
obj = new Box();
10%
Box obj = new Box;
Which keyword is used by the method to refer to the object that invoked it?
Anonymous Quiz
22%
import
66%
this
10%
abstract
2%
abstract
Which keyword is used in Java to create a new instance of a class?
Anonymous Quiz
76%
new
21%
class
0%
struct
3%
create
Identify and correct the error in the following Java code snippet to demonstrate the correct use of an abstract class.

abstract class Animal {
abstract void eat();
}
class Dog extends Animal {
void eat() {
System.out.println("Dog eats");
}
}
public class TestAnimal {
public static void main(String[] args) {
Animal a = new Dog();
a.eat();
}
}



حدد وصحح الخطأ في الشفرة البرمجية جافا التالية لتوضيح الاستخدام الصحيح للصف المجرد.
Which of the following is a valid Java statement to check if 'x' is either 10 or 20?
Anonymous Quiz
75%
if (x == 10 || x == 20) {}
13%
if (x = 10 || x = 20) {}
13%
if (x == 10 && x == 20) {}
0%
if (x = 10 && x = 20) {}
Correct the error in the following Java code snippet to properly encapsulate the 'name' field.

class Person {
public String name;
public String getName() {
return name;
}
public void setName(String newName) {
this.name = newName;
}
}
صحح الخطأ في الشفرة البرمجية جافا التالية لتغليف حقل 'name' بشكل صحيح.
How do you increment a variable `x` by 1 in Java?
Anonymous Quiz
32%
x++
11%
x+=1
2%
x=x+1
54%
All of the above
What will be the output of the following Java code snippet that demonstrates the use of static variables?

class Counter {
static int count = 0;
Counter() {
count++;
System.out.println(count);
}
}
public class TestCounter {
public static void main(String[] args) {
Counter c1 = new Counter();
Counter c2 = new Counter();
Counter c3 = new Counter();
}
}



ماذا سيكون المخرج للشفرة البرمجية جافا التالية التي توضح استخدام المتغيرات الثابتة؟
What is the default value of a boolean variable in Java?
Anonymous Quiz
17%
true
54%
false
23%
null
5%
0
What is the output of the following Java code snippet using polymorphism?

class Animal {
void sound() {
System.out.println("Animal makes a sound");
}
}
class Dog extends Animal {
void sound() {
System.out.println("Woof");
}
}
public class Test {
public static void main(String[] args) {
Animal myAnimal = new Dog();
myAnimal.sound();
}
}



ما هو مخرج الشفرة البرمجية جافا التالية باستخدام الشكلية البوليمورفية؟