Java 8 Streams Interview Questions

Download the Eclipse IDE from the Eclipse Foundation, choose the Eclipse IDE for enterprise Java and web developers, and install with the built-in Java 17 VM.

Clone Java eight streams project from the link or zip, then import it into Eclipse as a folder or archive to access interfaces set one, set two, and set three.

Discover that a functional interface has only one abstract method, can include any number of static and default methods, and cannot extend another interface.

Explore how the consumer and BiConsumer functional interfaces work in Java 8, using accept to process input and andThen chaining to concatenate, uppercase, and compute length.

Explore the predicate functional interface, its test method, default and static methods, and how to implement string-based predicates with length checks and equality tests, including and, or, negate, and BiPredicate.

Explore the functional interface by implementing a single abstract method apply with input type string and return type integer, and using BiFunction for two inputs and a result.

The lecture demonstrates chaining functions in Java 8 streams by computing string's length, checking if it is greater than two, and combining with and then to yield a boolean result.

Demonstrate the Java 8 supplier functional interface, with a no input get method that returns a value; use a lambda to return 'hello world' and call get.

Explore Java 8 streams by processing a stream of numbers to compute sum and average, filter even and odd numbers, identify numbers starting with 4, and detect duplicates.

Explore the setup for the Java eight streams interview series by examining a stream of numbers and outlining operations like summing, max, min, and sorting.

Learn to sum a sequence of numbers with Java 8 streams using reduce, turning a stream into a single sum and printing the result.

Calculate the average of a number stream by mapping each value to double with a lambda expression, then use the built-in average and getAsDouble to obtain the result.

Use Java 8 streams to separate and print even and odd numbers with filter. Apply n modulo two equal to zero for evens and not equal to zero for odds.

Learn to use Java 8 streams to print numbers starting with four. Convert integers to strings with map, filter by starts with four, and print the results.

Learn how to use the skip operator in Java 8 streams to ignore the first five numbers, and see how results change when skipping two numbers.

Use Java 8 streams to compute and print min, max, sum, and average in a single pass by mapping to double and using summary statistics.

Explore finding the maximum and minimum numbers in a list using Java streams, with comparator-based max and min operations and handling optional results.

Explore printing numbers in ascending and descending order using Java 8 streams, sorting with sorted and reversing via a comparator, and collecting results to a list for display.

Explore how to retrieve the second highest and second lowest numbers with Java 8 streams by sorting in reverse and ascending order, using skip, limit, and find first.

Explore set two case studies with pojos, featuring an employee class, to perform operations like finding maximum and minimum salaries and identifying employees in each department.

Learn to count male and female employees with Java 8 streams by filtering on gender (case-insensitive), using the count terminal operation, and printing results.

Explore printing unique organization departments using Java 8 streams: map to extract department fields, avoid duplicates with distinct, and print HR, accounting, and IT.

Explore Java 8 streams to identify the highest paid employee by salary with a max comparator, handle the optional, print the result, and complete the minimum salary task.

Learn how to use Java 8 streams to filter employees by joining year. Extract the year, collect to a list, and print the matching names Krishna, Usha, and Ashok.

Count employees in each department using Java 8 streams by grouping by department and applying collectors.counting to produce a department-to-count map.

Compute the average salary per department using java 8 streams by grouping employees by department and applying an average on salary, then print the result map.

Identify the most senior employee by using Java 8 streams, finding the minimum join date with a comparator, and printing the result.

Explore counting male and female employees in the IT department using Java 8 streams. Filter by IT and group by gender with Collectors.groupingBy.

Learn to compute the total and average salary of an organization using Java 8 streams, map to extract salaries, and DoubleSummaryStatistics to obtain count, sum, min, max, and average.

Learn to sort employees by salary in descending order using streams, a salary method reference comparator, and reverse the comparator to achieve the result.

Identify the top three salaries from a descending employee list by applying limit(3) to the stream, and print the results.

Compute the average salary by gender using Java 8 streams by grouping employees by gender and applying collectors average double on salary.

Explore the third set of string problems using Java 8 streams, and learn to count each character's occurrences in a string with map and streams.

Demonstrates counting the occurrence of each character in a string with Java 8 streams, using group by and counting collectors, and printing results in Eclipse.

Learn how to find duplicate characters in a string using a map, convert to lowercase, filter entries with counts greater than one, and collect the duplicates into a list.

Find the first non-repeating character in a string using Java streams by grouping characters and counting, then selecting the key with a count of one and printing it.

Conclude by reinforcing Java 8 streams and interfaces, recap the top interview questions, and invite learners to stay tuned to the instructor profile for more interview series.