updated java junk files

.idea/workspace.xml

@@ -4,8 +4,9 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="8658cbac-7347-4046-83e8-57065c86d2b8" name="Changes" comment="updated readme to explain folder structure">
-      <change beforePath="$PROJECT_DIR$/practice_projects/src/substrings.java" beforeDir="false" afterPath="$PROJECT_DIR$/practice_projects/src/Substrings.java" afterDir="false" />
+    <list default="true" id="8658cbac-7347-4046-83e8-57065c86d2b8" name="Changes" comment="Explored using 2D arrays">
+      <change afterPath="$PROJECT_DIR$/practice_projects/src/QuizGame.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -64,6 +65,8 @@
     "Application.EnhancedSwitches.executor": "Run",
     "Application.GuessANumber.executor": "Run",
     "Application.Main.executor": "Run",
+    "Application.Numpad.executor": "Run",
+    "Application.QuizGame.executor": "Run",
     "Application.TempConverter.executor": "Run",
     "Application.WhileLoops.executor": "Run",
     "Application.compountInterest.executor": "Run",
@@ -123,7 +126,7 @@
       <workItem from="1767678323979" duration="16130000" />
       <workItem from="1767837943314" duration="237000" />
       <workItem from="1767838192168" duration="17826000" />
-      <workItem from="1768158295756" duration="4060000" />
+      <workItem from="1768158295756" duration="7326000" />
     </task>
     <task id="LOCAL-00001" summary="updated module output folders">
       <option name="closed" value="true" />
@@ -381,7 +384,31 @@
       <option name="project" value="LOCAL" />
       <updated>1768161949589</updated>
     </task>
-    <option name="localTasksCounter" value="33" />
+    <task id="LOCAL-00033" summary="updated name of class">
+      <option name="closed" value="true" />
+      <created>1768162380069</created>
+      <option name="number" value="00033" />
+      <option name="presentableId" value="LOCAL-00033" />
+      <option name="project" value="LOCAL" />
+      <updated>1768162380069</updated>
+    </task>
+    <task id="LOCAL-00034" summary="capitalized class name">
+      <option name="closed" value="true" />
+      <created>1768185705755</created>
+      <option name="number" value="00034" />
+      <option name="presentableId" value="LOCAL-00034" />
+      <option name="project" value="LOCAL" />
+      <updated>1768185705755</updated>
+    </task>
+    <task id="LOCAL-00035" summary="Explored using 2D arrays">
+      <option name="closed" value="true" />
+      <created>1768185728116</created>
+      <option name="number" value="00035" />
+      <option name="presentableId" value="LOCAL-00035" />
+      <option name="project" value="LOCAL" />
+      <updated>1768185728116</updated>
+    </task>
+    <option name="localTasksCounter" value="36" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -399,9 +426,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="created compound calculator" />
-    <MESSAGE value="fixed name of compoundInterest" />
-    <MESSAGE value="explored substring methods" />
     <MESSAGE value="made a lbs to kgs weight converter" />
     <MESSAGE value="explored ternary operator" />
     <MESSAGE value="uploaded junk files" />
@@ -424,7 +448,10 @@
     <MESSAGE value="created dice roll game. that shows all dice and total rolled" />
     <MESSAGE value="junk java files updated" />
     <MESSAGE value="updated readme to explain folder structure" />
-    <option name="LAST_COMMIT_MESSAGE" value="updated readme to explain folder structure" />
+    <MESSAGE value="updated name of class" />
+    <MESSAGE value="capitalized class name" />
+    <MESSAGE value="Explored using 2D arrays" />
+    <option name="LAST_COMMIT_MESSAGE" value="Explored using 2D arrays" />
   </component>
   <component name="XSLT-Support.FileAssociations.UIState">
     <expand />

practice_projects/src/Numpad.java

@@ -0,0 +1,25 @@
+public class Numpad {
+
+    public static void main(String[] args){
+        // This project is to show how to use 2D Arrays
+        // a.k.a. Nested arrays (an array of arrays)
+
+        // 2D arrays are useful for storing a matrix of data.
+
+
+        // Remember - Characters are single quotes 'C'
+        char[][] numpad = {{'1', '2', '3'},
+                            {'4', '5', '6'},
+                            {'7', '8', '9'},
+                            {'*', '0', '#'}};
+
+        // We need nested loops to print columns and rows
+        for(char[] row : numpad){
+            for(char number : row){
+                System.out.print(number + " ");
+            }
+            // Between every row add an empty line
+            System.out.println();
+        }
+    }
+}

practice_projects/src/QuizGame.java

@@ -0,0 +1,67 @@
+import java.util.Scanner;
+
+public class QuizGame {
+
+    public static void main(String[] args){
+
+        Scanner scanner = new Scanner(System.in);
+
+        // This is a quiz game using 2D arrays (Nested arrays)
+
+        System.out.println("******************************");
+        System.out.println("Welcome to the Java Quiz Game!");
+        System.out.println("******************************");
+        System.out.println();
+
+        // Variables
+        char[] answers = {'A', 'B', 'C', 'C', 'C'};
+        int score = 0;
+        char guess;
+
+        String[] questions = {
+                "What keyword is used to create a class in Java?",
+                "Which data type is used to store true or false values?",
+                "Which of the following is NOT a primitive data type in Java?",
+                "Which symbol is used to end a statement in Java?",
+                "Which keyword is used to inherit a class in Java?"
+        };
+
+        String[][] options = {
+                {"A. class", "B. new", "C. create", "D. object"},
+                {"A. int", "B. boolean", "C. String", "D. char"},
+                {"A. int", "B. double", "C. String", "D. boolean"},
+                {"A. :", "B. .", "C. ;", "D. ,"},
+                {"A. implements", "B. inherits", "C. extends", "D. super"}
+        };
+
+
+
+        for(int i = 0; i < questions.length; i++){
+            System.out.println(questions[i]);
+
+            for(String option : options[i]){
+                System.out.println(option);
+            }
+
+            System.out.print("Enter your guess: ");
+            guess = scanner.next().toUpperCase().charAt(0);
+
+            if(guess == answers[i]){
+                System.out.println("********");
+                System.out.println("CORRECT!");
+                System.out.println("********");
+                score++;
+            }
+            else {
+                System.out.println("********");
+                System.out.println("WRONG!");
+                System.out.println("********");
+            }
+        }
+
+        System.out.println("Your final Score is: " + score + " out of " + questions.length);
+
+        scanner.close();
+
+    }
+}