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int [ , ] array = new int[3, 3]; // ¤@­Ó3x3ªº¤Gºû°}¦C

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int [ , ] array = new int[3, 3] { {1,2,3}, {4, 5, 6}, {7,8,9} };
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int [ , ] array = new int[,] { {1,2,3}, {4, 5, 6}, {7,8,9} }; // ®ÄªG¤@¼Ë

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int [][] array = new int[3][];
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array[0] = new int[3];
array[1] = new int [5];
...

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int [][] array = new int [][] {
    new int[] {1,2,3},
    new int[] {4,5,6},
    new int[] {7,8,9}
};

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