Java Basic (7) - Multidimensional Arrays

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Arrays

• In java, array can have any type of data, including another array
• 2D array is not actually represented graphically in the memory
• Array[row][col], but technically there are no "rows" and "columns"
• Just make sure you remember which dimension is which
• There are no limits to the number of dimensions for arrays
• The "rows" don't need to be the same size
  • int[][] a = {{1,2}, {1,2,3,4,5,6}, {1}}
• You can leave the smaller arrays unallocated (the last dimensions only, you must give the first sizes>0 then you can leave the rest blank)
  • int[][][][] a = new int[3][5][][]      //works
• You can create arrays containing smaller arrays of assorted sizes
  • int[][] a = new int[3][]
  • a[0] = new int[4]
  • a[1] = new int[2]
  • a[2] = new int[3]

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