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Practice Zone • Java
10 Topics 151 Questions All Difficulty
Topics
All Questions Full list for Java 151 Arrays Practice Arrays with real questions. 15 Collections Practice Collections with real questions. 17 Control Flow Practice Control Flow with real questions. 15 Data Types Practice Data Types with real questions. 15 Exceptions Practice Exceptions with real questions. 15 Java Arrays Practice Java Arrays with real questions. 15 Methods Practice Methods with real questions. 14 OOP Basics Practice OOP Basics with real questions. 15 Operators Practice Operators with real questions. 15 Variables Practice Variables with real questions. 15
Questions
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Longest Palindromic Substring with Transformations
Medium
Jan 31, 2026
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Maximum Subarray Sum with Constraints
Medium
Jan 31, 2026
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Update running total
Easy
Jan 23, 2026
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Count positives and negatives
Easy
Jan 23, 2026
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Find min and max together
Easy
Jan 23, 2026
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Swap without temp using arithmetic
Medium
Jan 23, 2026
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Track best score with index
Medium
Jan 23, 2026
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Sliding sum of size k
Medium
Jan 23, 2026
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Balance tracker
Medium
Jan 23, 2026
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Compute prefix min array
Medium
Jan 23, 2026
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Variable scope demo (return value)
Hard
Jan 23, 2026
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Count distinct in range queries (offline)
Hard
Jan 23, 2026
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Event counter with rollback (savepoint idea)
Hard
Jan 23, 2026
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Rate limiter counter
Hard
Jan 23, 2026
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Compute max profit with two transactions
Hard
Jan 23, 2026
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Reverse an array in-place
Easy
Jan 23, 2026
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Count even numbers
Easy
Jan 23, 2026
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Check array sorted (non-decreasing)
Easy
Jan 23, 2026
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Find maximum element
Easy
Jan 23, 2026
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Sum of array elements
Easy
Jan 23, 2026
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Move zeros to end (stable)
Medium
Jan 23, 2026
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Rotate right by k
Medium
Jan 23, 2026
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Second largest distinct
Medium
Jan 23, 2026
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Find missing number 1..n
Medium
Jan 23, 2026
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Two sum in sorted array
Medium
Jan 23, 2026
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Count subarrays with sum = k
Hard
Jan 23, 2026
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Maximum product of any pair
Hard
Jan 23, 2026
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Merge two sorted arrays into first
Hard
Jan 23, 2026
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Longest consecutive sequence length
Hard
Jan 23, 2026
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Range add queries (difference array)
Hard
Jan 23, 2026
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Build a list from input values
Easy
Jan 23, 2026
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Remove duplicates but keep order
Easy
Jan 23, 2026
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Count frequency of numbers
Easy
Jan 23, 2026
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Use Deque as stack
Easy
Jan 23, 2026
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Queue simulation
Easy
Jan 23, 2026
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First unique number in list
Medium
Jan 23, 2026
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Top K frequent numbers
Medium
Jan 23, 2026
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Group numbers by remainder
Medium
Jan 23, 2026
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Sliding window max using deque
Medium
Jan 23, 2026
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Sort objects by two fields
Medium
Jan 23, 2026
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LRU cache (basic)
Hard
Jan 23, 2026
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Detect cycle in directed graph
Hard
Jan 23, 2026
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Merge intervals
Hard
Jan 23, 2026
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K-way merge of sorted lists
Hard
Jan 23, 2026
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Most common within window
Hard
Jan 23, 2026
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Sum numbers divisible by 3
Easy
Jan 23, 2026
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Count digits in a number
Easy
Jan 23, 2026
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Reverse digits
Easy
Jan 23, 2026
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Check leap year
Easy
Jan 23, 2026
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Print star pattern count
Easy
Jan 23, 2026
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FizzBuzz count
Medium
Jan 23, 2026
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Nth Fibonacci (iterative)
Medium
Jan 23, 2026
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GCD using Euclid
Medium
Jan 23, 2026
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Find first prime >= n
Medium
Jan 23, 2026
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Simulate simple ATM steps
Medium
Jan 23, 2026
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Minimum steps to reach target (1 or 2)
Hard
Jan 23, 2026
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Count paths in grid with obstacles
Hard
Jan 23, 2026
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Validate parentheses string
Hard
Jan 23, 2026
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Binary search first >= target
Hard
Jan 23, 2026
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Max subarray sum (Kadane)
Hard
Jan 23, 2026
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Check if value fits in byte
Easy
Jan 23, 2026
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Convert char digit to int
Easy
Jan 23, 2026
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Absolute difference as long
Easy
Jan 23, 2026
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Check if string is numeric (no sign)
Easy
Jan 23, 2026
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Parse binary string to int
Easy
Jan 23, 2026
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Clamp value in range
Medium
Jan 23, 2026
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Compare doubles with epsilon
Medium
Jan 23, 2026
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Count set bits in int
Medium
Jan 23, 2026
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Safe average without overflow
Medium
Jan 23, 2026
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Detect overflow on add
Medium
Jan 23, 2026
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Convert seconds to hh:mm:ss parts
Hard
Jan 23, 2026
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Fast power (pow)
Hard
Jan 23, 2026
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Encode two ints into one long
Hard
Jan 23, 2026
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Compute checksum mod 1e9+7
Hard
Jan 23, 2026
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Split integer into digits array
Hard
Jan 23, 2026
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Safe divide
Easy
Jan 23, 2026
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Validate positive input
Easy
Jan 23, 2026
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Parse int with fallback
Easy
Jan 23, 2026
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Array access safe read
Easy
Jan 23, 2026
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Ensure object not null
Easy
Jan 23, 2026
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Try-with-resources style (concept)
Medium
Jan 23, 2026
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Custom exception for business rule
Medium
Jan 23, 2026
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Validate age range
Medium
Jan 23, 2026
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Convert checked to unchecked
Medium
Jan 23, 2026
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Multiple validations with one throw
Medium
Jan 23, 2026
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Transactional-like update with rollback
Hard
Jan 23, 2026
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Retry operation 3 times
Hard
Jan 23, 2026
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Validate sorted input or fail fast
Hard
Jan 23, 2026
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Propagate cause chain
Hard
Jan 23, 2026
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Fail-safe resource close with primary exception
Hard
Jan 23, 2026
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Swap two elements
Easy
Jan 23, 2026
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Copy array manually
Easy
Jan 23, 2026
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Find first occurrence
Easy
Jan 23, 2026
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Count occurrences
Easy
Jan 23, 2026
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Find minimum value
Easy
Jan 23, 2026
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Reverse a subrange
Medium
Jan 23, 2026
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Remove element (new length)
Medium
Jan 23, 2026
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Merge two arrays alternately
Medium
Jan 23, 2026
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Prefix sum array
Medium
Jan 23, 2026
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Find majority element (Boyer-Moore)
Medium
Jan 23, 2026
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