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Message: [QUOTE="Kai Schwebke, post: 2917308"] boolean[n] consumes (most likely) c + n bytes. boolean[n][4] is one array of n references to n arrays of 4 bytes. Arrays are instances of class Array and consume (most likely) from 12 to 16 bytes{1}. The reference may need additional 4 bytes. All of this n times, leading to a quite high overhead. You may consider using a bitset and a calculated index (e.g. index = 4*a + b) to reduce the required heap space to c + n/8 bytes. Kai {1} see [URL]http://martin.nobilitas.com/java/sizeof.html[/URL] [/QUOTE]