COMP 202 Lecture 18: COMP 202 - Lecture 18 - Oct 17, 2016
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15 Jan 2018
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Three main ways to create 2d arrays: int[][] a = {{1,2,3},{5,6}}, int[][] a = new int[4][5], int[][] a = new int[3][]; The first element in the array is another array of length 3 (with values 1,2,3). The second element is an array of length 2 (with values 5,6) int[][] a = new int[4][5]; rectangle. Each element in the array is an array of length 5. Since this is a 2d int array, all values in the grid are initialized to zero int[][] a = new int[3][]; Each element in the array will be an array. However, the elements are currently empty, and so have the value null. When any reference type is declared but not initialized, it is given the value null. Null indicates an empty address if you print it, it will just say null null null . Method that takes as input a 2d integer array and an integer number.
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