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copied!<p><strong>code is written based to complete ASSUMPTIONS since the original poster @user3145523 has not posted his complete source code when i am posting this</strong></p> <pre><code> String ID = "fillit"; // fetch grade list for(ArrayList gradeList2 : records.get(ID).grade) { double sum = 0.0; double average = 0.0; // cal values for all grades for(int gradeValue : gradeList2) { sum = sum + gradeValue; } // cal average of sum average = sum / gradeList2.count(); } System.out.print("SUM: "+sum); System.out.print("\nAVERAGE: "+average); </code></pre> <hr> <blockquote> <p>Assumptions</p> </blockquote> <ol> <li>records is assumed to be a main ArrayList (the question is TAGGED arraylist)</li> <li>the records is assumed to contain another ArrayList called grades (in the first post the user seems to have a dynamic way to allocate grade count and a simple array for grade seems unlikely )</li> <li>assumed ArrayList grades is assumed to contain integer-int elements </li> <li><strong>major assumption</strong> average of grades of one student is computed . reason -> original poster said </li> </ol> <blockquote> <p>i want that method to only calculate the a certain number.. Look the output above. it calculated all my input and get its average i need help with that</p> </blockquote> <hr> <hr> <hr> <p>Asking user if this is fine in post (got no other option to contact)</p> <p>is this fine ? ? ?</p> <p>output pasted-></p> <blockquote> <h2>CMPE 325 Student Record Holder System</h2> <p>1.Add Student 2.View Records 3.Update Students 4.Get Average 5.Exit</p> <p>-------------------------------- Enter your choice: 1 How many Students you want to input?: 2 Student[1]Enter Id Number: 1 First Name: a Middle Name: b Last Name: c Degree: 1 Year Level: 1 Student[2]Enter Id Number: 2 First Name: d Middle Name: e Last Name: f</p> <h2>Degree: 1 Year Level: 1 CMPE 325 Student Record Holder System</h2> <p>1.Add Student 2.View Records 3.Update Students 4.Get Average 5.Exit</p> <p>-------------------------------- Enter your choice: 3</p> <p>Enter Id Number: 1</p> <p>----------------Student Info-------------- Id Number: 1 Name:a b c Degree and Year: 1-1</p> <p>The number of Sujects: 2 Name of Course: aa Enter Grade: 2 Name of Course: bb Enter Grade: 6 Enter another subject and grade? [Y]or[N]n</p> <h2>CMPE 325 Student Record Holder System</h2> <p>1.Add Student 2.View Records 3.Update Students 4.Get Average 5.Exit</p> <p>-------------------------------- Enter your choice: 3</p> <p>Enter Id Number: 2</p> <p>----------------Student Info-------------- Id Number: 2 Name:d e f Degree and Year: 1-1</p> <p>The number of Sujects: 2 Name of Course: cc Enter Grade: 5 Name of Course: dd Enter Grade: 7 Enter another subject and grade? [Y]or[N]n</p> <h2>CMPE 325 Student Record Holder System</h2> <p>1.Add Student 2.View Records 3.Update Students 4.Get Average 5.Exit</p> <p>-------------------------------- Enter your choice: 4 Enter An Valid Id Number: 1 SUM: 8.0 AVERAGE: 2.0</p> </blockquote> <hr> <p>CODE -> includes originally posted codes too <strong>(adding on user... request)</strong></p> <pre><code> import java.util.ArrayList; import java.util.Scanner; public class RecHolder { static ArrayList<Rec> record = new ArrayList<Rec>(); static ArrayList<Grade> records = new ArrayList<Grade>(); public RecHolder() { menu(); } @SuppressWarnings("resource") public static void menu() { Scanner in = new Scanner(System.in); int choice; System.out.println("CMPE 325 Student Record Holder System"); System.out.println("--------------------------------"); System.out.println("1.Add Student"); System.out.println("2.View Records"); System.out.println("3.Update Students"); System.out.println("4.Get Average"); System.out.println("5.Exit"); System.out.println(); System.out.println("--------------------------------"); System.out.print("Enter your choice: "); choice = in.nextInt(); switch (choice) { case 1: record(); break; case 2: display(); break; case 3: update(); break; case 4: average(); break; case 5: break; } } public static void record() { Scanner in = new Scanner(System.in); int total; System.out.println("How many Students you want to input?: "); total = in.nextInt(); Rec[] student = new Rec[total]; for (int index = 0; index < student.length; index++) { student[index] = new Rec(); System.out.printf("Student[%d]", index + 1); System.out.println("Enter"); in.nextLine(); System.out.print("Id Number: "); student[index].setIdNumber(in.nextLine()); System.out.print("First Name: "); student[index].setFirstName(in.nextLine()); System.out.print("Middle Name: "); student[index].setMiddleName(in.nextLine()); System.out.print("Last Name: "); student[index].setLastName(in.nextLine()); System.out.print("Degree: "); student[index].setDegree(in.nextLine()); System.out.print("Year Level: "); student[index].setYearLevel(in.nextInt()); record.add(student[index]); } menu(); } public static void displayall() { Scanner in = new Scanner(System.in); if (record.size() == 0) { System.out.print("Invalid\n"); in.nextLine(); menu(); } else { if (records.size() == 1) { System.out .print("-------------The Record for all Student-----------"); for (int i = 0; i < record.size(); i++) { System.out.printf("\nStudent[%d]", i + 1); System.out.print("\nId Number: " + record.get(i).getIdNumber()); System.out.print("\nName: " + record.get(i).getFirstName() + " " + record.get(i).getMiddleName() + " " + record.get(i).getLastName()); System.out.print("\nDegree and Year: " + record.get(i).getDegree() + "-" + record.get(i).getYearLevel() + "\n\n"); } in.nextLine(); display(); } else { System.out .print("--------------The Record for all Student------------"); for (int i = 0; i < record.size(); i++) { System.out.printf("\nStudent[%d]", i + 1); System.out.print("\nId Number: " + record.get(i).getIdNumber()); System.out.print("\nName: " + record.get(i).getFirstName() + " " + record.get(i).getMiddleName() + " " + record.get(i).getLastName()); System.out.print("\nDegree and Year: " + record.get(i).getDegree() + "-" + record.get(i).getYearLevel() + "\n\n"); } // for(int loopforSubjct = 0 ; loopforSubjct < records.size(); // loopforSubjct++ ) // { // System.out.printf("\nSubject: "+ // records.get(loopforSubjct).getSubject()+" Grade: "+ // records.get(loopforSubjct).getGrade()); // } in.nextLine(); } } display(); } public static void specific() { Scanner in = new Scanner(System.in); if (record.size() == 0) { System.out.print("Enter Data 1st\n"); in.nextLine(); menu(); } else { String id = new String(); System.out.print("Enter Id Number: "); id = in.nextLine(); if (records.size() == 1) { for (int loopforSpcfc = 0; loopforSpcfc < record.size(); loopforSpcfc++) { if (id.equals(record.get(loopforSpcfc).getIdNumber())) { System.out .printf("\n ----------------Student Exists-------------- "); System.out.print("\nId Number: " + record.get(loopforSpcfc).getIdNumber()); System.out.print("\nName:" + record.get(loopforSpcfc).getFirstName() + " " + record.get(loopforSpcfc).getMiddleName() + " " + record.get(loopforSpcfc).getLastName()); System.out.print("\nDegree and Year: " + record.get(loopforSpcfc).getDegree() + "-" + record.get(loopforSpcfc).getYearLevel() + "\n\n"); in.nextLine(); } else { in.nextLine(); System.out.print("Student Number Invalid!\n"); menu(); } } } else { for (int loopforSpcfc = 0; loopforSpcfc < record.size(); loopforSpcfc++) { if (id.equals(record.get(loopforSpcfc).getIdNumber())) { System.out.printf("\nStudent Exists"); System.out.print("\nId Number: " + record.get(loopforSpcfc).getIdNumber()); System.out.print("\nName: " + record.get(loopforSpcfc).getFirstName() + " " + record.get(loopforSpcfc).getMiddleName() + " " + record.get(loopforSpcfc).getLastName()); System.out.print("\nDegree and Year: " + record.get(loopforSpcfc).getDegree() + "-" + record.get(loopforSpcfc).getYearLevel() + "\n\n"); System.out.println(); } } for (int loopforSubjct = 0; loopforSubjct < records.size(); loopforSubjct++) { System.out.printf("\nSubject: " + records.get(loopforSubjct).getSubject() + " Grade: " + records.get(loopforSubjct).getGrade()); } in.nextLine(); } } display(); } public static void update() { Scanner in = new Scanner(System.in); if (record.size() == 0) { System.out.print("Enter Data 1st\n"); in.nextLine(); menu(); } else { String idnum = new String(); char answer; in.nextLine(); System.out.print("Enter Id Number: "); idnum = in.nextLine(); int total; for (int loopforSpcfc = 0; loopforSpcfc < record.size(); loopforSpcfc++) { if (idnum.equals(record.get(loopforSpcfc).getIdNumber())) { System.out .printf("\n ----------------Student Info-------------- "); System.out.print("\nId Number: " + record.get(loopforSpcfc).getIdNumber()); System.out.print("\nName:" + record.get(loopforSpcfc).getFirstName() + " " + record.get(loopforSpcfc).getMiddleName() + " " + record.get(loopforSpcfc).getLastName()); System.out.print("\nDegree and Year: " + record.get(loopforSpcfc).getDegree() + "-" + record.get(loopforSpcfc).getYearLevel() + "\n\n"); in.nextLine(); } } for (int loop = 0; loop < record.size(); loop++) { { if (idnum.equals(record.get(loop).getIdNumber())) { System.out.println("The number of Sujects: "); total = in.nextInt(); do { Grade[] update = new Grade[total]; for (int indexupdater = 0; indexupdater < update.length; indexupdater++) { update[indexupdater] = new Grade(); // set ID... String update[indexupdater].setIDNumber(idnum); in.nextLine(); System.out.print("Name of Course: "); update[indexupdater].setSubject(in.nextLine()); System.out.print("Enter Grade: "); update[indexupdater].setGrade(in.nextDouble()); records.add(update[indexupdater]); } System.out .print("Enter another subject and grade? [Y]or[N]"); String ans = in.next(); answer = ans.charAt(0); } while (answer == 'y'); } } } } menu(); } public static void average() { Scanner in = new Scanner(System.in); if (record.size() == 0) { System.out.print("Enter Data 1st\n"); in.nextLine(); menu(); } else { double sum = 0; double average = 0; String ID = new String(); System.out.print("Enter An Valid Id Number: "); ID = in.nextLine(); for (Rec rec : record) { if (rec.getIdNumber().equals(ID)) { for (Grade grade : records) { if (grade.getIDNumber().equals(ID)) { // System.out.println(grade.getIDNumber()); sum = sum + grade.getGrade(); } } // end loop-grade average = sum / records.size(); } // end if } // end loop-rec System.out.print("SUM: " + sum); System.out.print("\nAVERAGE: " + average); } } public static void display() { Scanner input = new Scanner(System.in); int choice; System.out.println("--------------------------------"); System.out.println("1.View List"); System.out.println("2.View Specific Record"); System.out.println("3.Exit"); System.out.println(); System.out.println("--------------------------------"); System.out.print("Enter your choice: "); choice = input.nextInt(); switch (choice) { case 1: displayall(); break; case 2: specific(); break; case 3: menu(); break; } } public static void main(String[] args) { new RecHolder(); } } </code></pre> <hr> <pre><code> class Grade { private String IDNumber; private String subject; private double grade; private double average; public Grade() { String IDNum; String sub; double grad; double ave; } public Grade(String IDNum, String sub, double grad, double ave) { this.IDNumber = IDNum; this.subject = sub; this.grade = grad; this.average = ave; } public void setSubject(String subject) { this.subject = subject; } public String getSubject() { return subject; } public void setGrade(double grade) { this.grade = grade; } public double getGrade() { return grade; } public String getIDNumber() { return IDNumber; } public void setIDNumber(String ID) { this.IDNumber = ID; } } </code></pre> <hr> <pre><code>public class Rec { private String IDNumber; private String firstName; private String middleName; private String lastName; private String degree; private int yearLevel; @Override public String toString() { return ("ID Number: " + this.getIdNumber() + "\nName: " + this.getFirstName() + " " + this.getMiddleName() + " " + this.getLastName() + "\nDegree and YearLevel: " + this.getDegree() + " - " + this.getYearLevel()); } public Rec() { String IDNum; String fName; String mName; String lName; String deg; int level; } public Rec(String IDNum, String fName, String mName, String lName, String deg, int level) { this.IDNumber = IDNum; this.firstName = fName; this.middleName = mName; this.lastName = lName; this.degree = deg; this.yearLevel = level; } public void setIdNumber(String IDNumber) { this.IDNumber = IDNumber; } public void setFirstName(String firstName) { this.firstName = firstName; } public void setMiddleName(String middleName) { this.middleName = middleName; } public void setLastName(String lastName) { this.lastName = lastName; } public void setDegree(String degree) { this.degree = degree; } public void setYearLevel(int yearLevel) { this.yearLevel = yearLevel; } public String getIdNumber() { return IDNumber; } public String getFirstName() { return firstName; } public String getMiddleName() { return middleName; } public String getLastName() { return lastName; } public String getDegree() { return degree; } public int getYearLevel() { return yearLevel; } } </code></pre>

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