Java Functional Programming With lambdas Limit Skip Min Max and Optionals
The code snippet demonstrates various operations on a collection of Product objects using Java Streams. Each operation is followed by printing the result to the console. Let's break down each section:
1. Skip the First Three Entries
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System.out.println("****Before Skip the first three entries from collection***");
List<Product> beforeSkipping = productList.stream().toList();
beforeSkipping.forEach(System.out::println);
System.out.println("**** After Skip the first three entries from collection***");
List<Product> skipFirstThree = productList.stream().skip(3).toList();
skipFirstThree.forEach(System.out::println);
Before Skipping:
Prints all products in productList.
After Skipping:
Creates a new list skipFirstThree by skipping the first three products from productList.
Prints the remaining products after skipping the first three.
2. Limit to the First Three Entries
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System.out.println("****Before Limit the first three entries from collection***");
List<Product> beforeLimitLastThree = productList.stream().toList();
beforeLimitLastThree.forEach(System.out::println);
System.out.println("**** After Limit the first three entries from collection***");
List<Product> AfterLimitLastThree = productList.stream().limit(3).toList();
AfterLimitLastThree.forEach(System.out::println);
Before Limiting:
Prints all products in productList.
After Limiting:
Creates a new list AfterLimitLastThree by limiting the stream to the first three products from productList.
Prints the first three products.
3. Find Maximum Value in a Collection with Comparator
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System.out.println("****Find a maximum value in a collection***");
Product findMaxNumberOfProductSold = productList.stream()
.max(Comparator.comparing(Product::getNumberOfProductSold))
.orElse(new Product());
System.out.println(findMaxNumberOfProductSold);
Find Max:
Finds the product with the maximum number of products sold using a comparator.
If no product is found (empty list), a new default Product is returned.
Prints the product with the maximum number of products sold.
4. Find Minimum Value in a Collection with Comparator
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System.out.println("****Find a minimum rated in a collection***");
Product findMinimumRatedProduct = productList.stream()
.min(Comparator.comparing(Product::getItemRating))
.orElse(new Product());
System.out.println(findMinimumRatedProduct);
Find Min:
Finds the product with the minimum item rating using a comparator.
If no product is found (empty list), a new default Product is returned.
Prints the product with the minimum item rating.
5. Find Minimum Rated Product with Rating Less Than 4
java
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System.out.println("****Find a minimum rated in a collection with rating less than 4***");
Optional<Product> findMinimumRatedProductWithRatingLessThan4 = productList.stream()
.min(Comparator.comparing(Product::getItemRating))
.filter(m -> m.getItemRating() < 4);
System.out.println(findMinimumRatedProductWithRatingLessThan4.isPresent());
Find Min with Condition:
Finds the product with the minimum item rating.
Filters the result to include only products with a rating less than 4.
Uses Optional to handle the case where no such product is found.
Prints whether a product with a rating less than 4 was found (true or false).
Summary
Skipping and Limiting: Demonstrates how to skip and limit entries in a stream.
Finding Min/Max: Uses comparators to find the minimum and maximum values in a collection.
Conditional Find: Combines finding a minimum value with an additional condition using Optional and filter.
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