src/com/github/puzzles/util/Matrices.java

   1 package com.github.puzzles.util;
   2
   3 import java.util.Arrays;
   4
   5 public class Matrices {
   6
   7         //Don't let anyone instance this class.
   8         private Matrices(){
   9         }
  10
  11         /**
  12          * Copy 2 dimensions array.
  13          *
  14          * @param original the matrix which you want make a copy of it.
  15          * @return the new copy.
  16          */
  17         public static <T> T[][] copyOf(T[][] original, int colsLength, int rowsLength){
  18                 T[][] returnedPuzzle = Arrays.copyOf(original, colsLength);
  19                 for(int i = 0; i < colsLength; i++)
  20                         returnedPuzzle[i] = Arrays.copyOf(original[i], rowsLength);
  21
  22                 return returnedPuzzle;
  23         }
  24
  25         public static <T> T[][] copyOf(T[][] original){
  26                 if (original.length < 0) {
  27                         return null;
  28                 }
  29                 return copyOf(original, original.length, original[0].length);
  30         }
  31
  32
  33         /**
  34          * Fill a value in a matrix.
  35          *
  36          * @param matrix the matrix which you want to fill in it.
  37          * @param val the value which you want fill it in the matrix.
  38          */
  39         public static <T> void fill(T[][] matrix, T val){
  40                 for(int i = 0; i < matrix.length; i++)
  41                         Arrays.fill(matrix[i], val);
  42         }
  43 }