1. Swapping Two Numbers
2. Factorial Number
3. Fibonacci Series
4. Armstrong Number
5. Perfect Number
6. Palidrome
7. String Reverse without using built-in method
8. String count repeated character
9. String array word count
10. Find duplicate remove string array

String Programs

1. Write a java program to reverse a given string without using any built-in method.
   For eg: If the input is "Arunkumar", the output shoud be "ramuknurA".

2. Given an alphanumeric string, write a java program to construct a new string where each letter in the original string is repeated a number of times equal to the next numeric character in the string,
   For eg: If the input is "a2b3c4", the output should be "aabbbcccc".

3. Given an alphanumeric string, write a java program to extract only the alphanumeric characters from the string without using built-in methods like Character.isLetter().
   For eg: If the input is "a2b3c4", the output should be "abc".

4. Given an alphanumeric string, write a java program to extract only the numeric characters from the string without using built-in methods like Character.isDigit().
   For eg: If the input is "a2b3c4", the output should be "234".

5. Write a java program to extract specific value from a input string based on user input at runtime.
   String input = "/Name= "Arunkumar"/CompanyName ="ABC Company"/Experience="1 year"";
   If the user enter = "CompanyName", the program should return "ABC Company".

Java8 Features Programming

1. Searching, Sorting, Finding elements using stream.