exercises updates

src/exercises/class2/Alice.java

@@ -0,0 +1,46 @@
+package exercises.class2;
+
+
+import java.util.Locale;
+import java.util.Scanner;
+
+public class Alice {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("Enter the length of the rectange: ");
+        double length = input.nextDouble();
+
+        System.out.println("Enter the length of the rectange: ");
+        double width = input.nextDouble();
+
+        System.out.println("The area is: " + length * width);
+
+        System.out.println("How many miles have you driven?");
+        double numMiles = input.nextDouble();
+
+        System.out.println("How much gas did you use? In gallons.");
+        double numGallons = input.nextDouble();
+
+        double mpg = numMiles / numGallons;
+        System.out.println("You are running on " + mpg + " mpg.");
+
+        String aliceText = "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(aliceText.toLowerCase(Locale.ROOT));
+        System.out.println(aliceText);
+
+        System.out.println(aliceText.toLowerCase(Locale.ROOT).contains("alice".toLowerCase(Locale.ROOT)));
+
+        System.out.println("Enter a word that contained in the aliceText: ");
+        String aliceWord = input.nextLine();
+
+        int wordIndex = aliceText.indexOf(aliceWord);
+        int wordLength = aliceWord.length();
+        System.out.println(wordIndex);
+        System.out.println(wordLength);
+
+        String aliceTextmodified = aliceText.replace(aliceWord, "");
+        System.out.println(aliceTextmodified);
+
+    }
+}

src/exercises/class2/HelloWorld.java

@@ -0,0 +1,13 @@
+package exercises.class2;
+import java.util.Scanner;
+
+public class HelloWorld {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.println("Hello, what is your name:");
+
+        String name = input.nextLine();
+        System.out.println("Hello " + name);
+    }
+
+}

src/exercises/class3/ControlFlowAndCollections.java

@@ -0,0 +1,109 @@
+package exercises.class3;
+
+import java.util.*;
+
+public class ControlFlowAndCollections {
+    public static void main(String[] args) {
+
+        // 3.7.1. Array Practice
+
+        int [] intArr = {1, 1, 2, 3, 5, 8};
+
+        for (int n : intArr) {
+            if (n % 2 == 1) {
+                System.out.println(n);
+            }
+        }
+
+        for (int i = 0; i < intArr.length; i++) {
+            if (intArr[i] % 2 == 1) {
+                System.out.println(intArr[i]);
+            }
+        }
+
+        String s1 = "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[] s2 = s1.split(" ");
+        System.out.println(s2);
+        for (String s: s2) {
+            System.out.println(s);
+        }
+        System.out.println(Arrays.toString(s2));
+
+        String[] s4 = s1.split("//.");
+        System.out.println(s4);
+        for(String sentence : s4) {
+            System.out.println(sentence);
+        }
+        System.out.println(Arrays.toString(s4));
+
+//      3.7.2. ArrayList Practice
+        ArrayList<Integer> arrlist = new ArrayList<>(Arrays.asList(1, 2));
+        arrlist.add(3);
+        arrlist.add(4);
+        arrlist.add(5);
+        arrlist.add(6);
+        arrlist.add(7);
+        arrlist.add(8);
+        arrlist.add(9);
+        arrlist.add(10);
+
+        System.out.println(calculateEvenSum((arrlist)));
+//        System.out.println(printFiveLetterWord(s1.split(" ")));
+        studentLogHashMap();
+    }
+
+    public static int calculateEvenSum( ArrayList<Integer> arr) {
+        int sum = 0;
+
+        for (int num : arr) {
+            if ( num % 2 == 1) {
+                sum += num;
+            }
+        }
+        return sum;
+    }
+
+    public static void printFiveLetterWord( List<String> strList) {
+        for (String word: strList) {
+            if (word.length() == 5 ) {
+                System.out.println(word);
+            }
+        }
+    }
+
+    // 3.7.3 HashMap
+    public static void studentLogHashMap() {
+        HashMap<Integer, String> studentLog = new HashMap<>();
+        Scanner input = new Scanner(System.in);
+        String newStudent;
+        Integer studentID;
+
+        System.out.println("Enter your students (or ENTER to finish):");
+
+        // Get student names and ID numbers
+        do {
+
+            System.out.println("Student: ");
+            newStudent = input.nextLine();
+
+            if (!newStudent.equals((""))) {
+                System.out.println("ID: ");
+                studentID = input.nextInt();
+                studentLog.put(studentID, newStudent);
+
+                input.nextLine();
+            }
+        } while(!newStudent.equals(""));
+
+        input.close();
+        System.out.println("\nClass roster:");
+
+        for (Map.Entry<Integer, String> student: studentLog.entrySet()) {
+            System.out.println(student.getValue() + "'s ID: " + student.getKey());
+        }
+
+        System.out.println("Number of students in the roster: " + studentLog.size());
+
+    }
+}

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

@@ -5,6 +5,8 @@ public class HelloMethods {
     public static void main(String[] args) {
         String message = Message.getMessage("fr");
         System.out.println(message);
+        String message_Eng = Message.getMessage("en");
+        System.out.println(message_Eng);
     }
 
 }

src/org/launchcode/java/demos/lsn3classes1/Course.java

@@ -0,0 +1,34 @@
+package org.launchcode.java.demos.lsn3classes1;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class Course {
+    private String courseName;
+    private ArrayList studentNames;
+    private HashMap studentIDs;
+
+    public String getCourseName() {
+        return courseName;
+    }
+
+    public ArrayList getStudentNames(){
+        return studentNames;
+    }
+
+    public HashMap getStudentIDs() {
+        return studentIDs;
+    }
+
+    public void setCourseName(String aCourseName) {
+        this.courseName = aCourseName;
+    }
+
+    public void setStudentNames(ArrayList aStudentNames) {
+        this.studentNames = aStudentNames;
+    }
+
+    public void setStudentIDs(HashMap aStudentIDs) {
+        this.studentIDs = aStudentIDs;
+    }
+}

src/org/launchcode/java/demos/lsn3classes1/Student.java

@@ -5,9 +5,42 @@
 
 public class Student {
 
-    private String name;
+    private String name = "Lindsey";
     private int studentId;
-    private int numberOfCredits = 0;
-    private double gpa = 0.0;
+    private int numberOfCredits = 1;
+    private double gpa = 4.0;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String aName) {
+        this.name = aName;
+    }
+
+
+    public int getStudentId() {
+        return studentId;
+    }
+
+    public void setStudentId(int aStudentID) {
+        this.studentId = aStudentID;
+    }
+
+    public int getNumberOfCredits() {
+        return numberOfCredits;
+    }
+
+    public void setNumberOfCredits(int aNumberCredits) {
+        this.numberOfCredits = aNumberCredits;
+    }
+
+    public double getGpa() {
+        return gpa;
+    }
+
+    public void setGpa(double aGpa) {
+        this.gpa = aGpa;
+    }
 
 }

src/org/launchcode/java/demos/lsn3classes1/Teacher.java

@@ -0,0 +1,11 @@
+package org.launchcode.java.demos.lsn3classes1;
+
+public class Teacher {
+    private String firstName;
+    private String lastName;
+    private String subject;
+    private Integer yearsTeaching;
+
+
+
+}

src/org/launchcode/java/demos/lsn4classes2/Student.java

@@ -29,21 +29,46 @@ public String studentInfo() {
     }
 
 
-     //TODO: Uncomment and complete the getGradeLevel method here:
-//    public String getGradeLevel() {
-//        // Determine the grade level of the student based on numberOfCredits
-//    }
+    public String getGradeLevel(int credits) {
+        String gradeLevel;
+        if (credits <= 29) {
+            gradeLevel = "Freshman";
+        } else if (credits <= 59) {
+            gradeLevel = "Sophomore";
+        } else if (credits <= 89) {
+            gradeLevel = "Junior";
+        } else{
+            gradeLevel = "Senior";
+        }
+        return gradeLevel;
+    }
 
-    // TODO: Complete the addGrade method.
     public void addGrade(int courseCredits, double grade) {
-        // Update the appropriate fields: numberOfCredits, gpa
+        double totalQualityScore = this.gpa * this. numberOfCredits;
+        totalQualityScore += courseCredits * grade;
+        this.numberOfCredits += courseCredits;
+        this.gpa = totalQualityScore/this.numberOfCredits;
     }
 
-    // TODO: Add your custom 'toString' method here. Make sure it returns a well-formatted String rather
-    //  than just the class fields.
+    public String toString() {
+        String studentReport = String.format("%s is a %s with %d credits and a GPA of %.2f", this.name, this.getGradeLevel(this.numberOfCredits), this.getNumberOfCredits(), this.getGpa());
+        return studentReport;
+    }
 
-    // TODO: Add your custom 'equals' method here. Consider which fields should match in order to call two
-    //  Student objects equal.
+    public boolean equals(Object toBeCompared) {
+        if (toBeCompared == this) {
+            return true;
+        }
+        if (toBeCompared == null) {
+            return false;
+        }
+        if (toBeCompared.getClass() != getClass()) {
+            return false;
+        }
+
+        Student theStudent = (Student) toBeCompared;
+        return theStudent.getStudentId() == getStudentId();
+    }
 
     public String getName() {
         return name;

src/org/launchcode/java/demos/lsn5unittesting/main/Car.java

@@ -47,6 +47,9 @@ public double getGasTankLevel() {
     }
 
     public void setGasTankLevel(double gasTankLevel) {
+        if (gasTankLevel > this.getGasTankSize()) {
+            throw new IllegalArgumentException("Can't exceed tank size");
+        }
         this.gasTankLevel = gasTankLevel;
     }
 
@@ -85,4 +88,8 @@ public void drive(double miles)
         this.odometer += milesAbleToTravel;
     }
 
+    public void addGas (double gas) {
+        this.setGasTankLevel(gas + this.getGasTankLevel());
+    }
+
 }