Java Stream - Exercises, Practice, Solutions
This resource offers a total of 40 Java Streams problems for practice. It includes 8 main exercises, each accompanied by solutions, detailed explanations, and four related problems.
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Processing Data with Java SE 8 Streams:
Stream is a sequence of elements from a source that supports aggregate operations. Let’s break it down:
- Sequence of elements: A stream provides an interface to a sequenced set of values of a specific element type. However, streams don’t actually store elements; they are computed on demand.
- Source: Streams consume from a data-providing source such as collections, arrays, or I/O resources.
- Aggregate operations: Streams support SQL-like operations and common operations from functional programing languages, such as filter, map, reduce, find, match, sorted, and so on.
1. Calculate average of integers using streams
Write a Java program to calculate the average of a list of integers using streams.
2. Convert strings to upper/lowercase using streams
Write a Java program to convert a list of strings to uppercase or lowercase using streams.
3. Sum even and odd numbers in list using streams
Write a Java program to calculate the sum of all even, odd numbers in a list using streams.
4. Remove duplicates from list using streams
Write a Java program to remove all duplicate elements from a list using streams.
5. Count strings starting with letter using streams
Write a Java program to count the number of strings in a list that start with a specific letter using streams.
6. Sort strings A-Z and Z-A using streams
Write a Java program to sort a list of strings in alphabetical order, ascending and descending using streams.
7. Find max and min in list using streams
Write a Java program to find the maximum and minimum values in a list of integers using streams.
8. Find 2nd smallest/largest using streams
Write a Java program to find the second smallest and largest elements in a list of integers using streams.
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More to Come !
Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.