In Java, what is the output of the code snippet above?
Anonymous Quiz
48%
The student: Student and the student has 300 dollars.
29%
The code does not compile.
23%
The code throws an exception called "InterruptedException".
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What is the output of the code above?
Anonymous Quiz
31%
The code does not compile due to Line X.
36%
The code does not compile because variables "age" and "float" are defined with protected keyword.
32%
The result: 17.75
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In Java, which keyword is used to implement inheritance between classes?
Anonymous Quiz
61%
extends
27%
implements
7%
new
5%
super
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What is the purpose of the "equals()" method in Java?
Anonymous Quiz
43%
To compare two objects for reference equality.
22%
To compare two objects for structural equality.
15%
To compare two objects for memory allocation.
19%
To compare two objects for data type compatibility.
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Which data structure uses the "First-In-First-Out" (FIFO) principle?
Anonymous Quiz
34%
Stack
55%
Queue
8%
arraylist
3%
hashset
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What is the correct way to declare a constant in Java?
Anonymous Quiz
26%
constant int x =5;
47%
final int x =5;
16%
int final x = 5;
11%
int x = constant 5 ;
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What is the purpose of the NullPointerException in Java?
Anonymous Quiz
28%
It is thrown when an arithmetic operation results in an undefined value.
51%
It is thrown when a null reference is accessed.
12%
It is thrown when a method is not found.
9%
It is thrown when the program runs out of memory.
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Which feature introduced in Java 8 allows you to write more concise and expressive code for handling collections?
Anonymous Quiz
23%
Enhanced for loop
20%
Generics
44%
Lambda expressions
12%
Method references
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In Java 11, which module was introduced to provide a standard API for working with HTTP clients and servers?
Anonymous Quiz
24%
21%
32%
java.http
23%
java.net.http
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In Java, which feature is used to define methods that can accept variable-length argument lists?
Anonymous Quiz
11%
Variadic functions
40%
Variable functions
21%
Varargs
28%
Variable methods
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Which feature, introduced in Java 12, allows the JVM to allocate and deallocate memory more efficiently for small objects?
Anonymous Quiz
45%
Switch Expressions
17%
Shenandoah GC
23%
Value Types
15%
Compact Strings
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Can an interface have static methods in Java?
Anonymous Quiz
54%
Yes, with the static keyword.
22%
No, static methods are not allowed in interfaces.
17%
Yes, with the abstract keyword.
7%
No, interfaces can only have instance methods.
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Which of the following is the return type of the lines() method in the java.nio.file.Files class?
Anonymous Quiz
33%
Stream<String>
20%
List<String>
11%
Set<String>
16%
Map<String, String>
21%
None of the above
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What is the purpose of the 'record' keyword introduced in Java 16?
Anonymous Quiz
43%
It creates a new record in a database.
25%
It defines a new type of class for storing records.
17%
It's a replacement for the 'enum' keyword.
15%
It's used to create classes for immutable data with automatic methods.
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What is the purpose of the Optional class?
Anonymous Quiz
48%
To represent a value that may or may not be present
21%
To represent a set of values
10%
To represent a map of values
13%
To represent a function
7%
None of the above
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