🔍 Finding Missing Numbers in an Array using Java Streams

📰 Dev.to · Praven Kumar

Learn to find missing numbers in an array using Java Streams in 5 minutes

intermediate Published 6 Apr 2026

Action Steps

Find the minimum and maximum values in the input array using Java Streams
Store the input array in a HashSet for efficient lookups
Generate a range of numbers from the minimum to the maximum value
Use Java Streams to filter out numbers that are present in the input array
Collect the missing numbers into a new array or list

Who Needs to Know This

Software engineers and developers can benefit from this technique to identify gaps in data sequences, improving data analysis and processing capabilities.

Key Insight

💡 Use Java Streams to efficiently identify missing numbers in a sequence by filtering out present numbers

Full Article

Input: [1,2,1,2,5,8] Output: [3,4,6,7] 🧠 Approach: 1️⃣ Find minimum and maximum values 2️⃣ Store...

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