In Java, which of these keywords is used to inherit methods and properties from a superclass?
Anonymous Quiz
23%
super
12%
this
53%
extends
12%
implements
❤2👍1
Which of the following is a valid way to create a thread in Java?
Anonymous Quiz
24%
By implementing the Runnable interface
28%
By extending the Thread class
7%
By using the ExecutorService
42%
Both A and B are correct
👍1
Which of the following is a valid declaration of a two-dimensional array in Java?
Anonymous Quiz
67%
int[][] array2D = new int[3][3];
19%
int array2D[][] = new int[][];
9%
int[] array2D = new int[3][3];
5%
int array2D[][] = new int[3];
Identify and fix the error in the following Java code snippet:
حدد وأصلح الخطأ في قطعة الكود الجافا التالية:
public class Main {
public static void Main(String[] args) {
System.out.println("Hello, world!");
}
} حدد وأصلح الخطأ في قطعة الكود الجافا التالية:
public class Main {
public static void Main(String[] args) {
System.out.println("Hello, world!");
}
}👍2
In Java, which of the following is a checked exception?
Anonymous Quiz
27%
NullPointerException
27%
ArrayIndexOutOfBoundsException
26%
IOException
20%
ArithmeticException
What is the purpose of a constructor in a Java class?
ما هو الغرض من منشئ في فئة جافا؟
ما هو الغرض من منشئ في فئة جافا؟
What is the purpose of the 'final' keyword when applied to a variable in Java?
Anonymous Quiz
78%
To create a constant variable
8%
To improve performance
8%
To allow variable value changes
6%
To make the variable public
What is the output of the following code snippet?
int[] array = {1, 2, 3, 4, 5};
System.out.println(array[3]);
int[] array = {1, 2, 3, 4, 5};
System.out.println(array[3]);
Anonymous Quiz
11%
3
82%
4
3%
5
5%
ArrayIndexOutOfBoundsException
❤1👍1
How do you find the length of an array 'arr' in Java?
Anonymous Quiz
34%
arr.length;
6%
arr.size();
51%
arr.length();
9%
length(arr);
❤3
What does the 'break' statement do in a loop in Java?
ماذا تفعل عبارة 'break' في حلقة في جافا؟
ماذا تفعل عبارة 'break' في حلقة في جافا؟
Which method in the 'Object' class is used to clone an object in Java?
Anonymous Quiz
53%
cloneObject()
10%
copy()
33%
clone()
4%
deepCopy()
In Java, what is a 'package' and how is it used?
في جافا، ما هو 'الحزمة' وكيف يتم استخدامها؟
في جافا، ما هو 'الحزمة' وكيف يتم استخدامها؟
What will be the result of trying to access an index outside the bounds of an array?
Anonymous Quiz
58%
ArrayIndexOutOfBoundsException
23%
IndexOutOfBoundsException
12%
NullPointerException
7%
No exception is thrown
How do you declare a two-dimensional array in Java?
كيف تعلن عن مصفوفة ثنائية الأبعاد في جافا؟
كيف تعلن عن مصفوفة ثنائية الأبعاد في جافا؟
What is the base class of all exceptions in Java?
Anonymous Quiz
18%
RuntimeException
14%
Error
25%
Throwable
43%
Exception
❤1
Which interface must a class implement to be used in a 'for-each' loop in Java?
Anonymous Quiz
45%
Iterable
25%
Collection
27%
List
3%
Enumerator
❤1