How Can I make 2D array with different data type?

Question

I know it's possible if the array type was class/object data type, but how can I store the values I want in a specific position? I want some elements to be Integers, some String, and some character.
please explain to me with a clear and easy example.
Thank you so much ❤

Answer 1

Your main will look something like this

Class Students

String firstname
int mark

getInfo()
printInfo()

//Main

get user input for how many students -> nStudents

create an array of your class Students[] one = new Students[nStudents];

you must create an object. one[x] = new Students();

then you can use a method to getInfo for one[x];

For loop to create objects and getInfo for all students x -> nStudents

another for loop is to printInfo for all Students in the array.

Your output file suggests you need to convert mark into a grade as well. example 80-89 = B.

arraylist and iterators not needed.
Try to getInfo and printInfo for one object in the array first, then the rest is just loops.

Students[] one = new Students[2]; // you can replace 2 with nStudents
one[0] = new Students();
one[0].getInfo();
one[0].printInfo();

Answer 2

I don't know of a 2D array that can be of two different data types but what you can try is to declare your 2D array as String because then it can take all possible values but it will be placed in Strings variables.

Example: (Java)

String[][] str = {{"1", "2", "3"},{"A", "B", "C"}} ;

Answer 3

String[ ][ ] personData = new String[2 ][4 ];

personData[0][0] = "First Name";
personData[0][1] = "Last Name";
personData[0][2] = "Mark";
personData[0][3] = "Grade";
personData[1][0] = "Joe";
personData[1][1] = "Schofield";
personData[1][2] = "100";
personData[1][3] = "A";

The above populates the two dimensional array, however if you wish to make a two dimensional array for arbitrary amount of people, you need to think about represent all the data that belongs to a person as a separate entity then it would be easy to iterate over those entities and assign them to the two dimensional array appropriately.

Answer 4

Array containing 2 different data types is not possible; how many dimensions of the array is irrelevant.

http://stackoverflow.com/questions/2015538/arrays-with-different-datatypes-i-e-strings-and-integers-objectorientend

Check best answer on this link green check mark, he explains your solution very well. the answer with 27 points, 2nd one down.

Answer 5

@sooso sweet , put your code on stack overflow question area describing your problem. You'll get immediate help and solutions.

Answer 6

It is not possible to have a 1-D array with two different types; nor is it possible with a 2-D or 3-D array.

A primitive array and an object array are not the same. The array i created in the code is an array of objects. You can have multiple datatypes; String, double, int, and other object types within a single element of the arrray, ie objArray[0] can contain as many different data types as you need.

Using a 2-D array has absolutely no affect on the output, but how the data is allocated.

It is like you want to use two different sticks of lipstick, but they are exactly the same color; RED. You just want to put on a layer of red with 2 different sticks, but no mater what the outcome is the same; your lips are red... putting on 2 different layers with the same stick is exactly the same output. Using 2 different sticks of lipstick is confusing, no purpose.

Answer 7

@Michael W the link you have given me is really close to my problem, but I still couldn't understand the solution 😢 can you please help me by giving me your email so I can send you my source file in Java, NetBeans and you fix it?
Thank you so much for everyone, I really really appreciate your helps 💕

Answer 8

@Ousmane Mahy Diaw
well my code is long and full of errors because I worked on it as 1D array and I was working to change it to 2D array, here's my code in the link below:

https://i.imgur.com/DbZUPoi.png

and here's the run I want to reach:

https://m.imgur.com/ejDTebM?r

sorry in the picture of run It should be 4 students as the user have entered but I cut the picture just to show an example

Answer 9

But do you really have to use a two dimensional array????. The picture you've provided can easily be done with toString() methods.

Answer 10

yes because I want to keep the Marks as Integers and the Grade as character 🙁

Answer 11

yes I want to do it by 2D array, I could do it easily by 1D array in the link below:

https://i.imgur.com/nQSjNLI.png

but the run I'm trying to reach seemed like a perfect matrix not like mine, more the name is longer more the spaces will be imperfect, so I thought it should be done by 2D array

and I also want to keep Marks as Integer and Grade as character

Answer 12

Simple design for you

Student class {
declare 4 members ie first name, last, mark, grade
make 4 methods, getFirstname, getLast, getMark, getGrade
}

Main{
GetHowMany students ie. scanner numberOfStudents = new Scanner (System.in);

Make array of students [numberOfStudents]

Loop through arrays and all their get methods.

output ALL your data

}

end of program.

Answer 13

@Michael W I will try do that now, hopefully I won't face a problem and be able to do it without using manually ways in assigning values

Answer 14

@Michael W can you please explain this step
" Loop through arrays and all their get methods. "

it's my only problem for now

Answer 15

The link i sent to stackoverflow with the solution very close to what you need is there. Study/review "ArrayLists", then study "iterators".

I would gladly help you more later, however I must go to work now.

Answer 16

alright, Thank you so muuuch 💖

Answer 17

I'm still looking to learn the answer 😢

to be honest I didn't study/review Arrays lists and iterators 🤕

Answer 18

your answer is by one dimensional array, I could solve it easily by this way

I just don't know how can it be by two dimensional array, I remember I tried to do it last night and it didn't work with me, I really wonder how can I solve it by two dimensional array just.

and sorry I just could see your answer now

Thank You so much Michael W, I really appreciate all your helps ☺

Answer 19

for example, How to create this by 2 dimensional array:

First name Last name Mark Grade
Name Name 100 A