9 Answers

New AnswerSingle dimension arrays are used to store a objects of same type. For eg: To store employees record or students record. Assume the case if you want to store students/employees informations from various departments. So multidimensional array comes in the picture. For eg: Info _info [10][20]; Here first dimension (10) represents the number of department and second dimension (20) represents number of students in that particular department. _info [0] pointing to the first department students information. _info [2][3] pointing to the third department and 4 student information. Hope this helps you to understand and usage for multidimensional Array.

Sorry I am not sure what exactly your question is. But, if you want to intialize the 2d array, you can achieve like this info[][] = {{dept1stu1, dept1stu2,....}, {dept2stu1, dept2stu2,...}, {.....}, {.....}, ....... }; info[1][0] is pointing to dept2stu2. Hope it's helpful and addressed your doubt

There are better methods for storing that information. For instance, using the Map collection, you can define a set of "keys" corresponding to the departments, and for each key, define an array representing students. Map<String, String[]> deptRoll = new HashMap<String, String[]>(); deptRoll.put("dept1", {"stud1", "stud2", ...}); deptRoll.put("dept2", {"stud3", "stud4", ...}); System.out.println(deptRoll.get("dept1")[0]); Output: "stud1"

For two-dimensional arrays you can picture a matrix: String [][] students = { {"stud1", "stud2", "stud3"}, {"stud4", "stud5", "stud6"}, {"stud7", "stud8", "stud9"} } Array indices start with 0, so to reference an element at a given row-col position, you use arrayName[row - 1][col - 1]. For "stud6" in row 2, col 3, we write: students[2 - 1][3 - 1] which is students[1][2] which will return "stud6" Higher-order arrays are also possible but harder to visualize, and often they are replaced by other structures better suited to multidimensional data.

As Yellephant said there is hell lot of ways to store these dept student informations. But this question is related to multidimensional array I shown this example use array.

int a[3][2][4][5]; the [3][2] is a 3x2 table. the [4] makes them 4 tables, each is 3x2. the [5] makes it 5 sets .. each set has 4 tables, each table is 3x2.

Thanks! but when u define a multidimensional array in code its like info[][] ={dep1, dep2} {student 1... or how u could express the students in each departament?