snhrdt / eng3ex

Some short Java exercises

Basic Java programming exercises

General requirements

1. Work in this repository only; do not fork it. This is a private repository for only you, the applicant, and me as the reviewer.
2. For each of the following exercises, create a folder and develop your solution inside this folder. Each solution should have one executable Main class; you can use additional classes as you see fit.
3. Unless otherwise stated, you can use all classes, interfaces, enums etc. of the Java 11 SDK. Do not use any additional libraries.
4. Each solution to an exercise needs to be independent of the other solutions and should be easily runnable by executing the Main class: java Main.
5. If there are one or more additional questions in an exercise, copy them to a README.md file in the solution folder and answer them in this file.

Exercises

foobar

Implement a Java program that loops over all integers from 0 to 100. Each integer shall be printed on a new line. If the integer is divisible by 7 but not by 3, a space followed by the string foo shall be printed after the integer. If the integer is divisible by 7 and 3, a space followed by the string foobar shall be printed after the integer. For integers divisible by 3 but not by 7, a space followed by the string bar shall be printed after the integer.

Try to optimize the code to use the least amount of comparisons during its execution, and describe in the README.md what you did.

Stream processing

Consider the following employee data:

Name	Age	Salary	Office
Andrew	32	65000	LA
Beatrice	28	47000	NYC
Charles	42	72000	LA
Debbie	45	71000	NYC
Emily	55	82000	LA
Frankie	23	37000	NYC
George	52	43000	LA
Hillary	48	48000	NYC
Irene	31	42000	LA
Jeffrey	27	39000	NYC
Kevin	21	27000	LA

Create a class Employee so that its objects will hold this data. Add the objects to a map that maps the name of an employee to the Employee object holding this employees data.

Then, using stream processing, compute the following statistics and results and print them out:

1. Overall average age.
2. Average salary of employees over 30 years in the NYC office.
3. Names of all employees older than fourty with a salary below 50.000.
4. Number of employees per office.