From d8774d5ea6874846879789c17bca32792258d3cb Mon Sep 17 00:00:00 2001
From: Martin Vatshelle <mva021@ii0233228.klient.uib.no>
Date: Thu, 20 Mar 2025 12:26:18 +0100
Subject: [PATCH] Code after lecture 12
---
.../lecture12_generics/MostCommonFinder.java | 34 +++++++++++++++++++
src/main/java/lecture12_generics/Pair.java | 25 ++++++++++++++
.../lecture12_generics/UseMostCommon.java | 21 ++++++++++++
src/main/java/lecture12_generics/UsePair.java | 20 +++++++++++
4 files changed, 100 insertions(+)
create mode 100644 src/main/java/lecture12_generics/MostCommonFinder.java
create mode 100644 src/main/java/lecture12_generics/Pair.java
create mode 100644 src/main/java/lecture12_generics/UseMostCommon.java
create mode 100644 src/main/java/lecture12_generics/UsePair.java
diff --git a/src/main/java/lecture12_generics/MostCommonFinder.java b/src/main/java/lecture12_generics/MostCommonFinder.java
new file mode 100644
index 0000000..971fbbb
--- /dev/null
+++ b/src/main/java/lecture12_generics/MostCommonFinder.java
@@ -0,0 +1,34 @@
+package lecture12_generics;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+public class MostCommonFinder {
+
+ public static <T> T findMostCommon(List<T> list) {
+ Optional<T> bestElem = Optional.empty();
+ int maxAntall=0;
+ for(T elem : list) {
+ //int antall = countOccurences(list, elem);
+ int antall = Collections.frequency(list, elem);
+ //update max value
+ if(antall>maxAntall) {
+ maxAntall = antall;
+ bestElem = Optional.of(elem);
+ }
+ }
+ return bestElem.get();
+ }
+
+ private static <T> int countOccurences(List<T> list, T elem) {
+ //telle antall ganger dette elementet forekommer
+ int antall = 0;
+ for(T elem2 : list) {
+ if(elem.equals(elem2)) {
+ antall++;
+ }
+ }
+ return antall;
+ }
+}
diff --git a/src/main/java/lecture12_generics/Pair.java b/src/main/java/lecture12_generics/Pair.java
new file mode 100644
index 0000000..17fed41
--- /dev/null
+++ b/src/main/java/lecture12_generics/Pair.java
@@ -0,0 +1,25 @@
+package lecture12_generics;
+
+public class Pair<T,V> {
+
+ T first;
+ V last;
+
+ Pair(T first, V last){
+ this.first = first;
+ this.last = last;
+ }
+
+ T getFirst(){
+ return first;
+ }
+
+ V getLast(){
+ return last;
+ }
+
+ @Override
+ public String toString() {
+ return first.toString()+", "+last.toString();
+ }
+}
diff --git a/src/main/java/lecture12_generics/UseMostCommon.java b/src/main/java/lecture12_generics/UseMostCommon.java
new file mode 100644
index 0000000..939efe8
--- /dev/null
+++ b/src/main/java/lecture12_generics/UseMostCommon.java
@@ -0,0 +1,21 @@
+package lecture12_generics;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class UseMostCommon {
+
+ public static void main(String[] args) {
+ List<Integer> tall = new ArrayList<Integer>();
+ tall.addAll(Arrays.asList(1,2,3,2,3,5,2,7,3,2,8));
+ Integer common = MostCommonFinder.findMostCommon(tall);
+ System.out.println("Most common: "+common);
+
+ List<String> names = new ArrayList<>();
+ names.addAll(Arrays.asList("Per","Lise","Martin","Lise","Ole"));
+ String mostCommon = MostCommonFinder.findMostCommon(names);
+ System.out.println("Most common: "+mostCommon);
+ }
+
+}
diff --git a/src/main/java/lecture12_generics/UsePair.java b/src/main/java/lecture12_generics/UsePair.java
new file mode 100644
index 0000000..12f4b14
--- /dev/null
+++ b/src/main/java/lecture12_generics/UsePair.java
@@ -0,0 +1,20 @@
+package lecture12_generics;
+
+public class UsePair {
+
+ public static void main(String[] args) {
+ Pair<String,String> navn = new Pair<String,String>("Martin", "Vatshelle");
+ String firstString = navn.getFirst();
+ System.out.println(navn);
+
+ Pair<Integer,Integer> tall = new Pair<Integer,Integer>(12,17);
+ Integer firstTall = tall.getFirst();
+ System.out.println(tall);
+
+ Pair<String,Integer> par = new Pair<String,Integer>("INF",101);
+ String first = par.getFirst();
+ Integer last = par.getLast();
+ System.out.println(par);
+ }
+
+}
--
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