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Q1831. Difference between Tree and Graph ?

Data Structures

Ans. Graph contain cycles whereas Trees cannot.

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_{Like Discuss Correct / Improve graph trees data structures tree vs graph}

Q1832. What does the following initialization mean ?

ArrayList<LinkedList> traversalPaths = new ArrayList<LinkedList>();

What could be the use of such a collection.

Core Java

Ans. Initialize an ArrayList that will hold LinkedLists i.e every element of the arraylist will be a linked list.

Such collection could be used in algorithms that require first random access and then sequential traversal. For example - Storing traversal paths for a graph wherein we can start from any vertex. Implementing dictionary with each arraylist element holding staring with character and then linked list holding duplicate words.

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_{Like Discuss Correct / Improve collections linkedlist arraylist}

Q1833. What will be the output upon executing main method

public class Graph {
   private static Multimap<Integer,Integer> adjacentDirectedNodesMap = ArrayListMultimap.create();

   Graph(){
      adjacentDirectedNodesMap.put(1, 2);
      adjacentDirectedNodesMap.put(1, 3);
      adjacentDirectedNodesMap.put(1, 4);
      adjacentDirectedNodesMap.put(3, 5);
      adjacentDirectedNodesMap.put(4, 5);
   }

   public static void main(String[] args){
      ArrayList visited = new ArrayList();

      Integer startNode = 1;

      for(Integer adjacentNodes: adjacentDirectedNodesMap.get(startNode)){
            System.out.println(adjacentNodes);
      }
   }
}

Core Java

Ans. Nothing as we haven't yet created an instance and hence adjacentDirectedNodesMap won't be initialized with any value and hence is empty.

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_{Like Discuss Correct / Improve constructor}

Q1834. Given the list of adjacent nodes, What will be the Breadth First path

1 -> 2
1 -> 3
1 -> 6
2 -> 4
3 -> 5

Algorithm

Ans. 1 -> 2 -> 3 -> 6 -> 4 - > 5

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_{Like Discuss Correct / Improve breadth first traversal graph traversal}

Q1835. Given the list of adjacent nodes, What will be the Depth First path

1 -> 2
1 -> 3
1 -> 6
2 -> 4
3 -> 5

Algorithm

Ans. 1 -> 2 -> 4 -> 3 -> 5 -> 6

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_{Like Discuss Correct / Improve depth first traversal graph traversal}

Q1836. What will happen in a graph traversal if we don't have a check for cycle

Algorithm

Ans. It will result in never ending loop

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_{Like Discuss Correct / Improve graph traversal}

Q1837. What is the difference between return and continue statement ?

Core Java

Ans. return is used within a method to return control out of the method. It may be followed by a value which is returned from the method to calling method immediately preceding the point of call.

continue statement is used within a loop to start next iteration without executing the remaining statements in the loop.

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_{Like Discuss Correct / Improve return statement continue statement return vs continue for loop control statements loop statement}

Q1838. What is the difference between return and break statement ?

Core Java

Ans. return is used within a method to return control out of the method. It may be followed by a value which is returned from the method to calling method immediately preceding the point of call.

break statement is used within a loop to move control out of the loop.

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_{Like Discuss Correct / Improve return statement break statement return vs break}

Q1839. What is the difference between Java SE Map and Apache Commons MultiMap ? How can we implement functionality similar to multimap using Java SE map ?

Core Java

Ans. We can have duplicate keys within MultiMap whereas we cannot have duplicate keys within Java Util Map.

We can have a Map with value as a "collection of values" instead of single value to have a similar function as Multimap.

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_{Like Discuss Correct / Improve Apache commons multimap map vs multimap}

Q1840. What is the difference between hasNextInt and nextInt method of scanner class ?

Core Java

Ans. The hasNextInt() is used to check if there are any more elements left and the nextInt() is used to access that element.

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_{Like Discuss Correct / Improve input output Scanner}

Q1841. Is it a bad practice to initialize object reference to Null ?

Core Java

Ans. never initialise local to null,yes it is bad pratice

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_{Like Discuss Correct / Improve null nullpointerexception}

Q1842. What will be the output of following code and Why ?

int x = 5;
int y = 7;
float f = 5f;
float z = y / x * f;
System.out.println(z);

Core Java

Ans. 5.0

operation between two ints generate int only. so 7/5 generates 1 and not 1.4. Multiplication between int and float generates float and hence

1 * 5.0 = 5.0

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_{Like Discuss Correct / Improve arithmetic calculation data types}

Q1843. How do you know if a method is a constructor ?

Core Java

Ans. Is the method name same as class Name - Yes

Does the method have any return type ( even void ) - No

It's a constructor

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_{Like Discuss Correct / Improve constructor}

Q1844. Is a string an array of characters in Java ?

Core Java

Ans. No, String is a class whose objects are called strings in Java.

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_{Like Discuss Correct / Improve String}

Q1845. Can we synchronize the run() method in Java?

Core Java

^{This question is still unanswered. Can you please provide an answer.}

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_{Like Discuss Correct / Improve synchronization multithreading run method}

Q1846. What are the worst anti patterns in Java ?

Design

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_{Like Discuss Correct / Improve antipattern anti pattern}

Q1847. Difference between if and switch ? Can we replace all switch statements with if statements ?

Core Java

Ans. if statement is used to do 2 direction branching whereas switch is used to do multi direction branching in Java.

Yes we can replace all switch statements with nested if statements.

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_{Like Discuss Correct / Improve switch if vs switch}

Q1848. What is nested if ?

Core Java

Ans. if statements nested within another if or else blocks are called nested if statements.

if(condition1) {
if(condition2){
}
}

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_{Like Discuss Correct / Improve if statement control statements nested if}

Q1849. Write a Program to check if the entered number is a Duck Number ( Number having 0 in it ) ?

Core Java

^{This question is still unanswered. Can you please provide an answer.}

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_{Like Discuss Correct / Improve code coding duck number}

Q1850. What will the following code print ?

int x[] = new int[5];
x[0] = 1;
x[1] = 2;

for(int count=0;count<x.length;count++){
System.out.println(x[count]);
}

Core Java

Ans. 1
2
0
0
0

As arrays are not dynamically expanded , we have declared the array for size 10. As we have only initialized only 2 values , it will print rest as their default values.

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_{Like Discuss Correct / Improve arrays}

Q1851. What will the following code print

int x[] = new int[5];
x[0] = 1;
x[1] = 2;

for(int count=0;count<=x.length;count++){
System.out.println(x[count]);
}

Core Java

Ans. 1
2
0
0
0
ArrayIndexOutOfBoundException: 5

As array index starts with 0 and ends with the index of (size - 1), the index 5 is inaccessible for the array and hence will throw the exception.

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_{Like Discuss Correct / Improve arrays}

Q1852. what are different pointer operators used ?

Core Java

^{This question was recently asked at 'Huawei Technologies'.This question is still unanswered. Can you please provide an answer.}

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Q1853. What is mutable in Java ?

Core Java

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Q1854. Which java features makes java different from other languages ?

Core Java

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Q1855. Why cant we start an identifier with a number in Java?

Core Java

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Q1856. What is the default data type of Serialized methods?'

Core Java

^{This question was recently asked at 'Intime Tec'.This question is still unanswered. Can you please provide an answer.}

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Q1857. Do we have a method to reverse a string in String class ?

Core Java

Ans. No but we have it in StringBuilder.

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_{Like Discuss Correct / Improve String StringBuilder Reverse a string}

Q1858. How can we convert char into a String ?

Core Java

Ans. We can use StringBuilder. StringBuilder accepts char as the argument for it's constructor.

new StringBuilder('').toString();

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_{Like Discuss Correct / Improve convert char to String char String}

Q1859. How can we check if a particular character is upper case in Java ?

Core Java

Ans. 1. We can compare the ascii value of the character. Ascii for Capital case character is from 65 to 90.

2. We can compare to see if lowerCase of the character is not equal to character itself.

For example -

if character is 'a' the following code

new StringBuilder(char).toString().toLowerCase().equals(new StringBuilder(char)

will return true and hence char is lower case

if character is 'A' the following code

new StringBuilder(char).toString().toLowerCase().equals(new StringBuilder(char)

will return false and hence char is upper case

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_{Like Discuss Correct / Improve check upper case character character}

Q1860. How different is it when final applied to variables and object references ?

Core Java

Ans. final when assigned to object references doesn't make them immutable. It means that the references cannot be de-referenced.

final when applied to variables means that the value cannot be changed.

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_{Like Discuss Correct / Improve final keyword final variable}

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