# Multiply two matrices : Array « Collections Data Structure « Java

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 Java » Collections Data Structure » Array

Multiply two matrices
 ```      /**  * Multiply two matrices.  * Only defined for int: TODO: rewrite using 1.5 Generics to add   * support for long, float, and double.  * @author Ian F. Darwin, http://www.darwinsys.com/  * @version \$Id: Matrix.java,v 1.4 2004/03/07 02:53:53 ian Exp \$  */ public class Matrix {   /* Matrix-multiply two arrays together.    * The arrays MUST be rectangular.    * @author Tom Christiansen & Nathan Torkington, Perl Cookbook version.    */   public static int[][] multiply(int[][] m1, int[][] m2) {     int m1rows = m1.length;     int m1cols = m1[0].length;     int m2rows = m2.length;     int m2cols = m2[0].length;     if (m1cols != m2rows)       throw new IllegalArgumentException("matrices don't match: " + m1cols + " != " + m2rows);     int[][] result = new int[m1rows][m2cols];     // multiply     for (int i=0; i
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