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Discover how to concatenate strings efficiently and eliminate duplicate words using Java. Our guide provides clear examples and a practical solution.
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How to Concatenate Two Strings and Omit Possible Duplicate Words

String manipulation is a common task in programming and can often lead to interesting challenges. One such challenge is concatenating two strings where you want to ensure that any duplicate words at the boundary between the two strings are only represented once. This can be particularly useful in text processing and applications needing efficient string handling.

The Problem

Imagine you have two strings, and you want to combine them into one. However, there's a catch: if the last word of the first string is the same as the first word of the second string, you only want one of those words to appear in the resulting concatenated string.

Example Scenarios

Let's examine a couple of examples to clarify this concept:

Input:

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Output:
hello world am waiting — here, 'world' appears only once.

Input:

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Output:
call attested with level A — again, 'attested' appears only once.

This may seem simple, but implementing a solution requires a clear approach.

The Solution

To solve this problem, we can create a method that follows a series of logical steps. The idea is to check the last word in the first string against the first word in the second string. If they match, we concatenate the strings while omitting one of the words.

Step-by-Step Approach

Identify the Last Word of the First String:
To find the last word of s1, we can use the lastIndexOf method to get the position of the last space, and then use substring to extract the last word.

Identify the First Word of the Second String:
We can use the split method to separate s2 into words and take the first element.

Comparison and Concatenation:

If the last word from s1 matches the first word from s2, concatenate s1 with s2 starting from the index of the first word in s2 plus the length of the last word.

If they do not match, simply concatenate s1 and s2 with a space in between.

Implementation in Java

Here’s how you can implement this logic in Java:

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Testing the Method

To ensure our method works correctly, we can use assertions to test various cases, including edge cases:

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Conclusion

By following these steps, we can effectively concatenate two strings while omitting possible duplicate words. This method not only improves the readability of your code but also enhances the overall efficiency when handling string data.

Now you have a solid understanding of how to solve string concatenation challenges with potential duplicates in Java. Happy coding!