From 22c38737b9dce869ffe6800000feaa078ae000d4 Mon Sep 17 00:00:00 2001
From: Dao <comnuoc@users.noreply.gitlab.utu.fi>
Date: Sun, 23 Jun 2024 00:14:50 +0300
Subject: [PATCH] feat(part2): Exercise 1.
---
part_2/exercise_1/.gitignore | 30 +++++++++++
part_2/exercise_1/exercise_1.iml | 11 ++++
part_2/exercise_1/src/Exercise1.java | 75 ++++++++++++++++++++++++++++
part_2/exercise_1/src/Main.java | 6 +++
4 files changed, 122 insertions(+)
create mode 100644 part_2/exercise_1/.gitignore
create mode 100644 part_2/exercise_1/exercise_1.iml
create mode 100644 part_2/exercise_1/src/Exercise1.java
create mode 100644 part_2/exercise_1/src/Main.java
diff --git a/part_2/exercise_1/.gitignore b/part_2/exercise_1/.gitignore
new file mode 100644
index 0000000..d578053
--- /dev/null
+++ b/part_2/exercise_1/.gitignore
@@ -0,0 +1,30 @@
+### IntelliJ IDEA ###
+/.idea/
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
\ No newline at end of file
diff --git a/part_2/exercise_1/exercise_1.iml b/part_2/exercise_1/exercise_1.iml
new file mode 100644
index 0000000..c90834f
--- /dev/null
+++ b/part_2/exercise_1/exercise_1.iml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+ <component name="NewModuleRootManager" inherit-compiler-output="true">
+ <exclude-output />
+ <content url="file://$MODULE_DIR$">
+ <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+ </content>
+ <orderEntry type="inheritedJdk" />
+ <orderEntry type="sourceFolder" forTests="false" />
+ </component>
+</module>
\ No newline at end of file
diff --git a/part_2/exercise_1/src/Exercise1.java b/part_2/exercise_1/src/Exercise1.java
new file mode 100644
index 0000000..319ddd7
--- /dev/null
+++ b/part_2/exercise_1/src/Exercise1.java
@@ -0,0 +1,75 @@
+import java.util.ArrayList;
+
+public class Exercise1 {
+ class EmptyArray extends Exception {
+ }
+
+ class ArrayNegativeNumbersException extends Exception {
+ public ArrayNegativeNumbersException(String message) {
+ super(message);
+ }
+ }
+
+ public void main() {
+ printAvg(new int[]{1, -2, -3, 4});
+ printAvg(new int[]{1, 2, 3});
+ printAvg(new int[]{-1, 2, 3, -4});
+ }
+
+ public float avg(int[] nums) throws EmptyArray, ArrayNegativeNumbersException { // 1
+ int sum = 0;
+ ArrayList<String> errors = new ArrayList<String>();
+
+ if (nums == null || nums.length == 0)
+ throw new EmptyArray(); // 2
+
+ for (int i = 0; i < nums.length; i++) {
+ int n = nums[i];
+
+ if (n < 0) {
+ errors.add(getErrorMessage(i, n));
+ } else {
+ sum += n;
+ }
+ }
+
+ if (!errors.isEmpty()) {
+ throw new ArrayNegativeNumbersException(String.join("\n", errors));
+ }
+
+ return sum / nums.length;
+ }
+
+ private void printAvg(int[] nums) {
+ Float result;
+
+ try {
+ result = avg(nums);
+
+ System.out.println(result);
+ } // 3
+ catch (EmptyArray e) {
+ } // 3
+ catch (ArrayNegativeNumbersException e) {
+ System.out.println(e.getMessage());
+ }
+ }
+
+ private String getErrorMessage(int index, int number) {
+ int position = index + 1;
+
+ String positionSuffix = switch (position) {
+ case 1 -> "st";
+ case 2 -> "nd";
+ case 3 -> "rd";
+ default -> "th";
+ };
+
+ return String.format(
+ "The %d%s number %d in your array is invalid",
+ position,
+ positionSuffix,
+ number
+ );
+ }
+}
diff --git a/part_2/exercise_1/src/Main.java b/part_2/exercise_1/src/Main.java
new file mode 100644
index 0000000..7cd5395
--- /dev/null
+++ b/part_2/exercise_1/src/Main.java
@@ -0,0 +1,6 @@
+public class Main {
+ public static void main(String[] args) {
+ Exercise1 exercise = new Exercise1();
+ exercise.main();
+ }
+}
\ No newline at end of file
--
GitLab