Java MockTest
#### What does JVM stand for?
1. [ ] Java Visual Machine
2. [x] Java Virtual Machine
3. [ ] Java Virtual Memory
4. [ ] Java Virtual Method
#### Which keyword is used to define a constant in Java?
1. [ ] constant
2. [x] final
3. [ ] static
4. [ ] const
#### What is the output of the following code snippet?
```java
int x = 5;
System.out.println(x++ + ++x);
```
1. [ ] 10
2. [ ] 11
3. [x] 12
4. [ ] 13
#### What is the default value of a boolean variable in Java?
1. [x] false
2. [ ] true
3. [ ] 0
4. [ ] 1
#### What does the "this" keyword refer to in Java?
1. [x] Current class instance
2. [ ] Parent class instance
3. [ ] Subclass instance
4. [ ] Static variable
#### What is the parent class of all classes in Java?
1. [x] Object
2. [ ] Main
3. [ ] Super
4. [ ] None of the above
#### Which of the following is not a primitive data type in Java?
1. [ ] int
2. [ ] float
3. [x] string
4. [ ] char
#### What does the "break" keyword do in Java?
1. [x] Exits the current loop or switch statement
2. [ ] Continues to the next iteration of the loop
3. [ ] Jumps to a specific label
4. [ ] Terminates the program
#### Which collection class allows you to associate a unique key with a value in Java?
1. [ ] ArrayList
2. [x] HashMap
3. [ ] LinkedList
4. [ ] TreeSet
#### What is the access level of a default modifier in Java?
1. [ ] Private
2. [ ] Protected
3. [ ] Public
4. [x] Package-private
#### What is the result of 10 % 3 in Java?
1. [ ] 0
2. [x] 1
3. [ ] 2
4. [ ] 3
#### What is the main purpose of the "super" keyword in Java?
1. [x] To call the superclass constructor
2. [ ] To access the superclass methods and fields
3. [ ] To define a superclass
4. [ ] To initialize an object
#### Which keyword is used to declare a method that cannot be overridden in Java?
1. [x] final
2. [ ] static
3. [ ] abstract
4. [ ] private
#### What is the difference between == and .equals() method in Java?
1. [ ] They are equivalent
2. [x] == compares object references, .equals() compares object contents
3. [ ] .equals() compares object references, == compares object contents
4. [ ] They both compare object contents
#### What is the output of the following code snippet?
``` java
String str1 = "hello";
String str2 = "hello";
System.out.println(str1 == str2);
```
1. [x] true
2. [ ] false
3. [ ] Compilation error
4. [ ] Runtime error
#### Which of the following statements is true about interfaces in Java?
1. [ ] Interfaces can contain constructors
2. [ ] Interfaces can contain instance variables
3. [x] A class can implement multiple interfaces
4. [ ] Interfaces can extend classes
#### What is the output of the following code snippet?
``` java
int[ ] arr = {1, 2, 3, 4, 5};
System.out.println(arr.length);
```
1. [ ] 1
2. [x] 5
3. [ ] 4
4. [ ] Compilation error
#### Which of the following is not a type of loop in Java?
1. [ ] for
2. [x] foreach
3. [ ] do-while
4. [ ] while
#### Which keyword is used to prevent method overriding in Java?
1. [x] final
2. [ ] static
3. [ ] abstract
4. [ ] private
#### What is the purpose of the "toString()" method in Java?
1. [x] To convert an object to a string
2. [ ] To convert a string to an object
3. [ ] To compare two objects
4. [ ] To clone an object
BETA
