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Java Coding Challenges

Hands-on Java problems to build confidence with OOP, collections, and backend-style tasks by solving Java coding challenges.

Problems (6 total)

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Handle Nullable Values Safely

Java

Handle absent values without null checks

Solve

Group Words by First Letter

Java

Organize data into groups using collectors

Solve

Transform Strings Using References

Java

Simplify code with direct method references

Solve

Sum Numbers Using Stream Reduction

Java

Aggregate data using reduction operations

Solve

Combine Multiple Filter Conditions

Java

Build complex filters from simple conditions

Solve

Filter and Square Even Numbers

Java

Transform and filter collections using streams

Solve