جافا Java
6.46K subscribers
212 photos
18 videos
81 files
269 links
ليس عيبًا ألا تعرف شيئًا، ولكن العيب انك لا تريد أن تتعلم
Download Telegram
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؟
What is the output of the following Java code?
```java
String str1 = "Java"; String str2 = new String("Java"); System.out.println(str1 == str2); ```
Anonymous Quiz
35%
true
38%
false
16%
Java
12%
An exception is thrown
Identify and fix the error in the following Java code snippet that attempts to implement polymorphism.

interface Shape {
void draw();
}
class Circle implements Shape {
public void draw() {
System.out.println("Circle drawn");
}
}
public class TestPolymorphism {
public static void main(String[] args) {
Shape shape = new Circle();
shape.draw();
}
}



حدد وأصلح الخطأ في الشفرة البرمجية جافا التالية التي تحاول تنفيذ الشكلية البوليمورفية.
Which of the following is not a valid Java data type?
Anonymous Quiz
5%
int
4%
double
7%
String
5%
boolean
79%
real
👍1
Identify and fix the error in the following Java code snippet to correctly demonstrate the concept of an abstract class.

abstract class Animal {
abstract void eat();
}
class Dog extends Animal {
void eat() {
System.out.println("Dog eats food");
}
}



حدد وأصلح الخطأ في الشفرة البرمجية جافا التالية لتوضيح مفهوم الصف المجرد بشكل صحيح.
What is the output
👍1
Which keyword is used to declare an array in Java?
Anonymous Quiz
7%
array
11%
Array
34%
[]
49%
There is no specific keyword; use the data type followed by []
Fix the error in the following Java code snippet to correctly compare two strings for equality.

String str1 = "Java";
String str2 = "java";
System.out.println(str1 == str2);



أصلح الخطأ في الشفرة البرمجية جافا التالية لمقارنة سلسلتين نصيتين بشكل صحيح من أجل المساواة.
Which method must be implemented by a class that implements the `java.lang.Runnable` interface?
Anonymous Quiz
52%
run()
17%
start()
23%
execute()
8%
perform()