Print a 2 D Array or Matrix in Java - GeeksforGeeks

19 Feb, 2021
Prerequisites: Arrays in Java, Array Declarations in Java (Single and Multidimensional)
Method 1 (Simple Traversal) 
We can find the number of rows in a matrix mat[][] using mat.length. To find the number of columns in i-th row, we use mat[i].length.
Java
// Java program to print the elements of// a 2 D array or matriximport java.io.*;class GFG {     public static void print2D(int mat[][])    {        // Loop through all rows        for (int i = 0; i < mat.length; i++)             // Loop through all elements of current row            for (int j = 0; j < mat[i].length; j++)                System.out.print(mat[i][j] + " ");    }     public static void main(String args[])        throws IOException    {        int mat[][] = { { 1, 2, 3, 4 },                        { 5, 6, 7, 8 },                        { 9, 10, 11, 12 } };        print2D(mat);    }}
1 2 3 4 5 6 7 8 9 10 11 12 
Method 2 (Using for-each loop) 
This is similar to the above. Instead of simple for loops, we use for each loop here. 
Java
// Java program to print the elements of// a 2 D array or matrix using for-eachimport java.io.*;class GFG {     public static void print2D(int mat[][])    {        // Loop through all rows        for (int[] row : mat)             // Loop through all columns of current row            for (int x : row)                System.out.print(x + " ");    }     public static void main(String args[])        throws IOException    {        int mat[][] = { { 1, 2, 3, 4 },                        { 5, 6, 7, 8 },                        { 9, 10, 11, 12 } };        print2D(mat);    }}
1 2 3 4 5 6 7 8 9 10 11 12 
Method 3 (Prints in matrix style Using Arrays.toString()) 
Arrays.toString(row) converts the complete row is converted as a string and then each row is printed in a separate line. 
Java
// Java program to print the elements of// a 2 D array or matrix using toString()import java.io.*;import java.util.*;class GFG {     public static void print2D(int mat[][])    {        // Loop through all rows        for (int[] row : mat)             // converting each row as string            // and then printing in a separate line            System.out.println(Arrays.toString(row));    }     public static void main(String args[])        throws IOException    {        int mat[][] = { { 1, 2, 3, 4 },                        { 5, 6, 7, 8 },                        { 9, 10, 11, 12 } };        print2D(mat);    }}
[1, 2, 3, 4]
[5, 6, 7, 8]
[9, 10, 11, 12]
Method 4 (Prints in matrix style Using Arrays.deepToString())
Arrays.deepToString(int[][]) converts  2D array to string in a single step.
Java
// Java program to print the elements of// a 2 D array or matrix using deepToString()import java.io.*;import java.util.*;class GFG {     public static void print2D(int mat[][])    {        System.out.println(Arrays.deepToString(mat));    }     public static void main(String args[])        throws IOException    {        int mat[][] = { { 1, 2, 3, 4 },                        { 5, 6, 7, 8 },                        { 9, 10, 11, 12 } };        print2D(mat);    }}
[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]
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