Completed Lesson 1 exercises

src/exercises/Lesson1/Area.java

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+package exercises.Lesson1;
+import java.util.Scanner;
+
+public class Area {
+
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("Enter rectangle length in sq ft: ");
+        Double length = input.nextDouble();
+        System.out.println("Enter rectangle width in sq ft: ");
+        Double width = input.nextDouble();
+        Double area = length * width;
+        System.out.println("Your rectangle's area is: " + area + " sq ft");
+    }
+}

src/exercises/Lesson1/HelloWorld.java

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+package exercises.Lesson1;
+import java.util.Scanner;
+
+
+public class HelloWorld {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("What's your name?");
+        String name = input.nextLine();
+        System.out.println("Hello " + name);
+    }
+}
+

src/exercises/Lesson1/MilesPerGallon.java

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+package exercises.Lesson1;
+import java.util.Scanner;
+
+public class MilesPerGallon {
+    public static void main(String[] args){
+        Scanner input = new Scanner(System.in);
+        System.out.println("Enter the number of miles driven: ");
+        Double milesDriven = input.nextDouble();
+
+        System.out.println("Enter the amount of gas consumed (in gallons): ");
+        Double gasConsumed = input.nextDouble();
+
+        Double milesPerGallon = milesDriven/gasConsumed;
+        System.out.println("You are running on " + milesPerGallon + " mpg.");
+
+    }
+}

src/exercises/Lesson1/StringSearch.java

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+package exercises.Lesson1;
+import java.util.Locale;
+import java.util.Scanner;
+
+public class StringSearch {
+    public static void main(String[] args){
+        Scanner input = new Scanner(System.in);
+        String sentence = "Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice 'without pictures or conversation?'";
+
+        System.out.println("Enter your search term: ");
+        String searchTerm = input.nextLine().toLowerCase();
+
+        boolean contains = sentence.toLowerCase().contains(searchTerm);
+        System.out.println("The results of your search are " + contains);
+
+        System.out.println("The index of your search term is " + sentence.indexOf(searchTerm) + " and its length is " + searchTerm.length());
+
+        String newSentence = sentence.toLowerCase().replace(searchTerm, "");
+        System.out.println(newSentence);
+
+    }
+   }

src/exercises/Lesson2/ArrayListPractice.java

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+package exercises.Lesson2;
+
+import java.util.Arrays;
+import java.util.Scanner;
+import java.util.List;
+import java.util.ArrayList;
+
+public class ArrayListPractice {
+    /*Exercise 1*/
+    public static int evenSum(ArrayList<Integer> arr) {
+        int sum = 0;
+        for (int number : arr) {
+            if (number % 2 == 0) {
+                sum += number;
+            }
+        }
+        return sum;
+    }
+
+    /*Exercise 2 + 3*/
+    public static void printLetters(ArrayList<String> arr) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("Enter number of letters: ");
+        int numOfLetters = input.nextInt();
+        for (String word : arr) {
+            if (word.length() == numOfLetters) {
+                System.out.println(word);
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        ArrayList<Integer> values = new ArrayList<>();
+        for (int i = 0; i < 10; i++) {
+            values.add(i);
+        }
+
+        /*BONUS Exercise 3*/
+        String sentence = "I would not, could not, in a box. I would not, could not with a fox. I will not eat them in a house. I will not eat them with a mouse.";
+        sentence = sentence.replace(",", "");
+        sentence = sentence.replace(".", "");
+        String[] sentenceSplit = sentence.split(" ");
+        ArrayList<String> wordsArrList = new ArrayList<>(
+                Arrays.asList(sentenceSplit));
+        printLetters(wordsArrList);
+    }
+}

src/exercises/Lesson2/ArrayPractice.java

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+package exercises.Lesson2;
+
+import java.util.Arrays;
+
+public class ArrayPractice {
+    public static void main (String[] args){
+        /* Exercise 1 */
+        int[] values = {1,1,2,3,5,8};
+
+        /* Exercise 2 */
+        for (int value: values){
+            System.out.println(value);
+        }
+        /* Exercise 3 */
+        String sentence = "I would not, could not, in a box. I would not, could not with a fox. I will not eat them in a house. I will not eat them with a mouse.";
+        String[] splitSentence = sentence.split(" ");
+        /* Exercise 4 */
+        System.out.println(Arrays.toString(splitSentence));
+        /* Exercise 5 */
+        String[] sentences = sentence.split("\\.");
+        System.out.println(Arrays.toString(sentences));
+
+
+    }
+}

src/exercises/Lesson2/HashMapPractice.java

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+package exercises.Lesson2;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+public class HashMapPractice {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        HashMap<Integer, String> studentRoster = new HashMap<>();
+        String newStudent = "";
+        do {
+            System.out.print("Student: ");
+            newStudent = input.nextLine();
+
+            if (!newStudent.equals("")) {
+                System.out.print("ID: ");
+                Integer newID = input.nextInt();
+                studentRoster.put(newID, newStudent);
+
+                input.nextLine();
+            }
+        } while(!newStudent.equals(""));
+
+        input.close();
+
+        System.out.println("\nClass roster:");
+
+        for (Map.Entry<Integer, String> student : studentRoster.entrySet()) {
+            System.out.println(student.getValue() + "'s ID: " + student.getKey());
+        }
+
+        System.out.println("Number of students in roster: " + studentRoster.size());
+    }
+}

src/org/launchcode/java/demos/lsn1datatypes/TempConverter.java

@@ -1,14 +1,13 @@
 package org.launchcode.java.demos.lsn1datatypes;
 
-import java.util.Scanner;
 
 public class TempConverter {
     public static void main(String[] args) {
         double fahrenheit;
         double celsius;
-        Scanner input;
+        java.util.Scanner input;
 
-        input = new Scanner(System.in);
+        input = new java.util.Scanner(System.in);
         System.out.println("Enter the temperature in Fahrenheit: ");
         fahrenheit = input.nextDouble();
         input.close();