How to create a Three Dimensional List in Java - Step by Step Examples

How to create a Three Dimensional List in Java ?

Answer

To create a three-dimensional list in Java, you can use nested ArrayLists where each inner ArrayList represents a 2D plane within the 3D space.

✐ Examples

1 Create a 3D List of Integers

In this example,

We initialize a 3D ArrayList using ArrayList>>, where each innermost ArrayList represents a row in the 2D plane.
We use nested for loops to populate the 3D list with integers or perform operations on each element.

Java Program

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<ArrayList<ArrayList<Integer>>> matrix3D = new ArrayList<>();

        for (int i = 0; i < 3; i++) {
            ArrayList<ArrayList<Integer>> plane = new ArrayList<>();

            for (int j = 0; j < 3; j++) {
                ArrayList<Integer> row = new ArrayList<>();

                for (int k = 0; k < 3; k++) {
                    row.add(i + j + k);
                }

                plane.add(row);
            }

            matrix3D.add(plane);
        }

        System.out.println(matrix3D);
    }
}

Output

[[[0, 1, 2], [1, 2, 3], [2, 3, 4]], [[1, 2, 3], [2, 3, 4], [3, 4, 5]], [[2, 3, 4], [3, 4, 5], [4, 5, 6]]]

2 Create a 3D List of Strings

In this example,

We initialize a 3D ArrayList using ArrayList>>, where each innermost ArrayList represents a row in the 2D plane of strings.
We use nested for loops to populate the 3D list with strings or perform operations on each element.

Java Program

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<ArrayList<ArrayList<String>>> matrix3D = new ArrayList<>();

        for (int i = 0; i < 2; i++) {
            ArrayList<ArrayList<String>> plane = new ArrayList<>();

            for (int j = 0; j < 2; j++) {
                ArrayList<String> row = new ArrayList<>();

                for (int k = 0; k < 2; k++) {
                    row.add("(" + i + ", " + j + ", " + k + ")");
                }

                plane.add(row);
            }

            matrix3D.add(plane);
        }

        System.out.println(matrix3D);
    }
}

Output

[[[(0, 0, 0), (0, 0, 1)], [(0, 1, 0), (0, 1, 1)]], [[(1, 0, 0), (1, 0, 1)], [(1, 1, 0), (1, 1, 1)]]]

Summary

In this tutorial, we learned How to create a Three Dimensional List in Java language with well detailed examples.

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How to create a Three Dimensional List in Java - Step by Step Examples

How to create a Three Dimensional List in Java ?

Answer

✐ Examples

1 Create a 3D List of Integers

Java Program

Output

2 Create a 3D List of Strings

Java Program

Output

Summary

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