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Java two dimension array define: array[rows][cols]; String[][] array=new String[rows][cols]; array.length=rows; array.length[0].length=cols; Which style is perfect? int[] array int array[] Suggest the first that can point the int[] is a type. The second one is style of C although java supported. How to init array? int[] array={1,23,2}; int[] array=new int[3]; int[] array=new int[]{1,2,3}; int[][][] arrMatrix=new int[3][4][5]; arrMatrix[2][3][4]=234; multi-dimension array：high dimension is array of low dimension. int[4][3] : express a two dimension array,row=4,col=3 It equals to the following code. int[4] = {int[3],int[3],int[3],int[3]}; initialization of multi-dimension array： int[][] a={{1,2,3},{0,0,0}}; //2 rows,3 cols