Here are some JAVA Problems

$--$For each of the following exercises provide a solution that uses methods of

the Stream interface.

$1.$

Write a static method sumOdd that given a List of integers computes the sum of the

values that are odd.

$2$

Implement a generic record class ImmutablePair. Then, write a static

method someCalculation $($not in ImmutablePair$)$ that given a List

lst returns an object of ImmutablePair class. The first element of the

pair is the number of elements of lst in the range $[0\mathrm{.}2,$ Math.PI$],$ and

the second element is the average of the values of lst in the range $[10,100].$

$3$

Write a static method repl that given a List xs of Object and a integer n returns an

arraylist containing the elements of xs replicated n times in any order.

Hint: consider the flatMap method of Stream.

$4$

Write a function titlecase that given a list of strings converts it to titlecase by

uppercasing the letters of every word that starts with an $$a$.$

$5$

Write a static method replaceWord that given the name of a text file $($String

fileName$),$ a word $($String word$)$ and a replacement $($String repl$),$ prints the content

of fileName where each occurrence of word is replaced with repl. Note that the

structure, i$.$e$.$ lines, of fileName must be preserved. Test your method with the

file people.csv$,$ replacing for example true with false.