LinkedList problem statement?

Problem statement:
Given a LinkedList as follows, first can you write an algorithm to check whether this LinkedList is 
creating loop or not?
second if yes then how?
1 -> 2 -> 3 -> 4 -> 5 -> 6 ->3

Write an algorithm for the following problem statements !!

Problem statement:
Given two array as follows. 
a1[] = {1, 2, 3, 4, 5}
a2[] = {1, 2, 3, 0, 5}

we need to find out the missing element in second array which is present in first array, but not in second array.

Can you write the algorithm for the following statement?

Problem statement:
Given an array of integer, you need to write an algorithm so that it prints the expected behaviour?

Sample Input:
a[] = {1, 0, 2, 0, 3, 0}

Sample Ouput:

a[] = {1, 2, 3, 0, 0, 0}

Can we overload static method in Java?

Can we override static method in Java?

What are the types of Inheritance in Java?

Can you explain me Inheritance concept?

What is the difference between SOAP & REST in Java?

What is the difference between HashMap & Hashtable in Java?

Can you tell me at least three different ways to create the object in Java?

Problem statement:

How to prevent Singleton Pattern from Reflection, Serialization and Cloning?

Ref  - click

How HashMap works internally - Internal implementation of HashMap?

ref click

Can you write the code for switch statements using enum in Java SE 8 ?

Problem statement:
Write a program for switch statements using enum in Java.

1. enum APP {
2.     Google, Yahoo, Apple, HP
3. }
4. public class SwitchStatement {
5.     public static void main(String[] args) {
6.         APP c = APP.Google;
7.         switch (c) {
8.             case Apple:
9.                 System.out.println("You choose Apple.");
10.                 break;
11.             case Google:
12.                 System.out.println("You choose Google.");
13.                 break;
14.             case Yahoo:
15.                 System.out.println("You choose Yahoo.");
16.                 break;
17.             case HP:
18.                 System.out.println("You choose HP.");
19.                 break;
20.             default:
21.                 System.out.println("default");
22.                 break;
23.         }
24.     }
25. }

Output:

You choose Google.

what are the data types we cannot use in switch statement?

Problem statement:
what are the data types you cannot use as a parameter variable for switch statements in Java 8?

Following are the data types we cannot use as an input parameter variable for switch() statements.

1. long
2. float
3. double

Error: Incompatible type found long, float and double.

public class SwitchStatement {

    public static void main(String[] args) {

        double d = 10.5d;

        switch (d) {

            case 10.5d:

                System.out.println("double");

                break;            

            default:

                System.out.println("default");

                break;

        }

    }

}

Error: Incompatible types. Found: 'double'

what are the data types we can use in switch statement?

Problem statement:
what are the data types you can use as a parameter variable for switch statements in Java 8?
Following are the data types we can use as an input parameter variable for switch() statements.

1. byte
2. short
3. int
4. char

Add-On:

1. String 
2. enum