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TwoDArrayInstantiation.java
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package day6;
public class TwoDArrayInstantiation {
/*
time complexity: O(1)
space complexity: O(1)
*/
public static void main(String[] args) {
int[][] data = {
{},
{1},
{1, 2},
{1, 2, 3, 4, 5}
};
int[][][] complex = {
{
{1, 2, 3},
{3, 4, -100, 90}
},
{
{5, 6},
{},
{-56, 345, 23}
},
{
{},
{1},
{1, 2},
{1, 2, 3, 4, 5}
}
};
print(complex);
}
/*
avg_elems per column
time complexity: O(rows * avg_elems)
space complexity: O(1)
*/
private static void printPrimitive(int[][] matrix) {
for (int row = 0 ; row < matrix.length ; row++) {
for (int column = 0 ; column < matrix[row].length ; column++) {
System.out.print(matrix[row][column] + " ");
}
System.out.println();
}
}
/*
time complexity: O(rows * columns)
space complexity: O(1)
*/
private static void printPrimitive2(int[][] matrix) {
for (int row = 0 ; row < matrix.length ; row++) {
for (int element : matrix[row]) {
System.out.print(element + " ");
}
System.out.println();
}
}
/*
time complexity: O(rows * columns)
space complexity: O(1)
*/
private static void printPrimitive3(int[][] matrix) {
for (int[] row : matrix) {
for (int element : row) {
System.out.print(element + " ");
}
System.out.println();
}
}
/*
time complexity: O(n)
space complexity: O(1)
*/
private static void printAdvanced(int[] array) {
for (int element : array) {
System.out.print(element + " ");
}
System.out.println();
}
/*
time complexity: O(rows * columns)
space complexity: O(1)
*/
private static void printAdvanced(int[][] matrix) {
for (int[] row : matrix) {
printAdvanced(row);
}
}
/*
time complexity: O(n * rows * columns)
space complexity: O(1)
*/
private static void print(int[][][] array) {
for (int[][] matrix : array) {
print(matrix);
System.out.println("---------------");
}
}
/*
time complexity: O(rows * columns)
space complexity: O(1)
*/
private static void print(int[][] matrix) {
for (int[] element : matrix) {
print(element);
}
}
/*
time complexity: O(n)
space complexity: O(1)
*/
private static void print(int[] array) {
for (int element : array) {
System.out.print(element + " ");
}
System.out.println();
}
// pass by reference
/*
time complexity: O(1)
space complexity: O(1)
*/
private static void func(int[][] matrix) {
matrix[1][0] = 100;
}
/*
time complexity: O(1)
space complexity: O(1)
*/
private static void func(int a) {
a = 100;
}
/*
time complexity: O(1)
space complexity: O(1)
*/
private static void func(int[] i) {
i[0] = 100;
}
}