Part 3
What is the difference between sleep()
and wait() in java?
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|
Sleep() |
Wait() |
|
1. |
The sleep () method can be used to pause the process for some
time or the time we want to. |
Wait() is a method that can be used to put the thread in a
waiting state. |
|
2. |
Sleep() method never release the lock while sleeping the
thread. |
Wait() method can release the lock while a thread is waiting. |
|
3. |
Syntax:
synchronized(LOCK) {
Thread.sleep(1000);
} |
Syntax:
synchronized(LOCK) {
LOCK.wait();
} |
What is the difference between notify
and notifyAll()?
- Notify() method can be used to notify only one thread at a time which is
waiting in a waiting state.
- NotifyAll() method can be used to notify all threads at a time that is
waiting in a waiting state.
 
Note: Please click on Image to Purchase the books from Amazon.in |
What are the Implementation classes
of List Interface?
- List interface is the child interface of the Collection
interface.
- List of implementation classes of List interface.
1. ArrayList.
2. LinkedList.
3. Vector.
§ Stack.
What are the implementation classes
of Set Interface?
- Following are the Classes which implements Set
interface.
1. HashSet.
2. LinkedHashSet.
3. TreeSet.
What is the difference between Array
and ArrayList?
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Array |
ArrayList |
|
1. |
An array is a fixed length of data structure. It's not
dynamic. |
ArrayList is not a fixed type of data structure Arraylist is
dynamic. |
|
2. |
An array can store only homogeneous objects. |
ArrayList can store homogeneous as well as heterogeneous
objects. |
|
3. |
While declaring an array it is mandatory to declare the size of
an array. |
While declaring an ArrayList it is not mandatory to declare the
size of ArrayList. |
|
4. |
You cannot add a new element once the array gets full. |
You can easily add a new element once the ArrayList gets
full. |
|
5. |
An array is not a part of the collection framework. |
ArrayList is a part of the Collection framework. |
|
6. |
An array can be single or multidimensional. |
ArrayList cannot be multidimensional. |
|
7. |
For iterating array, we can use while loop, for loop, for each
loop. |
For iterating ArrayList, we can use an iterator. |
|
8. |
Arrays are by default type-safe. |
ArrayList is not by-default type-safe. We have to make it
type-safe explicitly. |
|
9. |
Performance of array is best than ArrayList. |
The performance of ArrayList is a little low as compared to an
array. |
What is the difference between Stack
and Queue?
|
|
Stack |
Queue |
|
1. |
The stack data structure is based on LIFO (Last In First Out)
principle. |
The queue data structure is based on FIFO (First In First Out)
principle. |
|
2. |
Stack has only one pointer points to elements which is always
point on top. |
The queue has two pointers, Front Pointer which is pointing to
the first element and the rear pointer points to the last
element. |
|
3. |
Insertion operation is called Push. |
Insertion operation is called Enqueue. |
|
4. |
The deletion operation is called Pop. |
The deletion operation is called Deque. |
|
5. |
Insertion and deletion in stacks take place only from one place
called Top. |
Insertion operation takes place at the rear of the queue and
deletion takes place at the front of the queue. |
What is bytecode?
- Java bytecode is the instruction set for the Java Virtual
Machine.
- Bytecode is the intermediate representation of a Java
program.
What is the different between Linkers
and Loaders?
|
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Linkers |
Loaders |
|
1. |
The main functionality of Linkers is to generate the executable
file. |
The main functionality of Loaders is to load the executable files
into the main memory. |
|
2. |
The process of combining source code to obtain executable code is
called Linkers. |
The process of loading executable code to the main memory for
further execution is called Loaders. |
|
3. |
The linker takes input from the Compiler or assembler. |
Loaders take input from Linkers. |
|
4. |
There are two types of Linker available.
1. Dynamic Linker.
2. Linkage Editor. |
There are four types of loader available.
1. BootStrap Loaders.
2. Absolute Loaders.
3. Direct Linking Loaders.
4. Relocating Loaders. |
What is Predicate functional
interface?
- Predicate is used to perform a particular condition
check.
- Predicate can be used like if condition. It will always return a Boolean
value.
- Please refer to the below example.
|
@FunctionalInterface public interface Predicate<T> {
} |
What is Function functional
interface?
- Function interface takes one argument and returns any type of object. As we
have seen Predicate return only Boolean but Function returns any type of
object.
- Please refer to the below example for syntax.
|
@FunctionalInterface public interface Function<T, R> {
} |
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- Interview questions on serialization in java for experienced - Click here
- Interview questions on inner class in java for experienced - Click here
- Interview questions on Collections in java for experienced - Click here
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