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Java Programming Tutorial | Finding the length of the longest substring | Be Practical.

🚀 Welcome to our Java Programming Tutorial. In today's coding challenge, we're going to tackle an intriguing problem that frequently appears in coding interviews: finding the length of the longest substring without repeating characters.

🧐 Problem Statement:
Given a string s, such as "abcabcbb," we need to find the length of the longest substring without any repeating characters.

⚙️ Code Implementation: Learn how to tackle this challenge step by step in Java. We'll explore an efficient algorithm that leverages string concatenation for the solution.

Step 1: Initialization
Initialize two pointers, start and end, both pointing to the beginning of the string.
Initialize an empty set to keep track of unique characters in the current substring.
Initialize a variable, max_length, to store the maximum length of the substring without repeating characters.

Step 2: Iterate Through the String
Start iterating through the string with the end pointer.
Check if the character at the end pointer is not in the set.
If it's not in the set, add it to the set and update max_length if needed.
Move the end pointer to the next character.
If the character is already in the set, move the start pointer until the repeating character is no longer in the set.

Step 3: Update Maximum Length
At each iteration, update max_length based on the current substring length.

Step 4: Final Result
The final result is the maximum length of the substring without repeating characters.

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