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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
Like7

Group Words by First Letter

Java

Organize data into groups using collectors

Solve
Like20

Transform Strings Using References

Java

Simplify code with direct method references

Solve
Like17

Sum Numbers Using Stream Reduction

Java

Aggregate data using reduction operations

Solve
Like25

Combine Multiple Filter Conditions

Java

Build complex filters from simple conditions

Solve
Like14

Filter and Square Even Numbers

Java

Transform and filter collections using streams

Solve
Like21