Java programs for interviews,

Java programs for interviews,

Java programs for interviews,

✅ String-Based Programs

Reverse each word in a sentence
Check if a string is a palindrome
Count vowels and consonants in a string
Remove duplicate characters from a string
Find the first non-repeated character
Check if two strings are anagrams
Count frequency of characters in a string
Convert string to title case (capitalize first letter)
Check for substring without using in-built methods
Replace all spaces with hyphens (-)

✅ Array-Based Programs

Find the largest and smallest number in an array
Find duplicate elements in an array
Sort an array without using built-in methods
Remove duplicates from an array
Reverse an array
Find the second largest number
Count the frequency of each element
Merge two arrays
Find the common elements between two arrays
Rotate an array to the left/right

✅ Number-Based Programs

Check if a number is prime
Generate Fibonacci series
Check if a number is Armstrong
Find factorial of a number
Check if a number is palindrome
Swap two numbers without using a third variable
Print all prime numbers between 1 and 100
Find GCD and LCM of two numbers
Convert decimal to binary
Count digits in a number

✅ Pattern Programs

Pyramid pattern
Diamond pattern
Floyd's triangle
Pascal’s triangle
Right-angled triangle of numbers/stars
Inverted triangle pattern
Hourglass/star pattern
Number increasing pattern
Zigzag pattern
Hollow rectangle

✅ Logic Building/General

Check if a year is a leap year
Print multiplication table of a number
Sum of digits of a number
Reverse digits of a number
Print even and odd numbers from 1 to N
Count the number of words in a sentence
Check if input is numeric (without try-catch)
Find repeated words in a sentence
Calculate power of a number without using Math.pow()
Find missing number in a sequence (like 1-100, missing 34)

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