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This article mainly explains "Java how to achieve sparse array and two-dimensional array conversion", the content of the article is simple and clear, easy to learn and understand, now please follow the editor's ideas slowly in depth, together to study and learn "Java how to achieve sparse array and two-dimensional array conversion" bar!

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Package com.malajava.sparsearray;public class SparseArray {public static void main (String [] args) {/ / create an 11 / 11 2D array int array [] [] = new int [11] [11]; array [1] [2] = 1; array [2] [3] = 2 System.out.println ("- 2D array -"); for (int [] row:array) {for (int data: row) {System.out.printf ("% d\ t", data);} System.out.println () } / / the two-dimensional array changes to a sparse array / / first traverses the two-dimensional array to get the number of non-zero data int sum=0; for (int [] row:array) {for (int data: row) {if (data! = 0) sum++ }} System.out.println ("- -"); System.out.println ("non-zero number is:" + sum); int sparseArray [] [] = new int [sum+1] [3]; sparseArray [0] [0] = 11; sparseArray [0] [1] = 11 SparseArray [0] [2] = sum; / / traversing a two-dimensional array stores non-zero numbers in a sparse array int count=0; / / used to record the number of non-zero data for

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