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Thread: Multi-dimension ArrayList example

  1. #1
    Junior Member
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    Post Multi-dimension ArrayList example

    Declare an array of 25 student scores in a test. Fill the array with random numbers between 1 and 100.
    Get the average of all marks.
    get the average of all students who scored an ‘A’ grade: 80% or over.
    how do i write this program

  2. #2
    Member Darryl.Burke's Avatar
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    Mar 2010
    Madgaon, Goa, India
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    Default Re: Multi-dimension ArrayList example

    Start here (link below)
    The Java™ Tutorials

    If you still need help, read this before asking again: (link below)
    How To Ask Questions The Smart Way


  3. #3
    Super Moderator helloworld922's Avatar
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    Default Re: Multi-dimension ArrayList example

    See this post for how to make multi-dimension ArrayLists: Multi Dimensional ArrayList example

  4. #4
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    Default Re: Multi-dimension ArrayList example

    For a beginning, I think you just need a Student class with name, score and grade attributes. Then, you can define an arraylist of Student with a length of 25. Prompt for student name, use the java.util.Random class to generate a random score for the students, test whether the score generated is more than 80, etc, and assign the relevant score. Add this student to the arraylist. Something like this:

    public class Student {
      private String name;
      private int score;
      private char score;
      public void setName( String name ) {
        this.name = name;
      public String getName() {
         return name;
      public void setScore( int score ) {
        this.score = score;
      public int getScore() {
        return score;
      public void setGrade( char grade ) {
        this.grade = grade;
      public char getGrade() {
        return grade;
      public void main( String[] args ) {
        List<Student> students = new ArrayList<Student>();
       int i = 0;
       while( i < 25 ) {
            // Generate your scores and grades here

    I hope this helps.

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