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multidimentionarray.java
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multidimentionarray.java
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public class App {
public static void main(String[] args) {
// 1D array
int[] values = {3, 5, 2343};
// Only need 1 index to access values.
System.out.println(values[2]);
// 2D array (grid or table)
int[][] grid = {
{3, 5, 2343},
{2, 4},
{1, 2, 3, 4}
};
// Need 2 indices to access values
System.out.println(grid[1][1]);
System.out.println(grid[0][2]);
// Can also create without initializing.
String[][] texts = new String[2][3];
texts[0][1] = "Hello there";
System.out.println(texts[0][1]);
// How to iterate through 2D arrays.
// first iterate through rows, then for each row
// go through the columns.
for(int row=0; row < grid.length; row++) {
for(int col=0; col < grid[row].length; col++) {
System.out.print(grid[row][col] + "\t");
}
System.out.println();
}
// The last array index is optional.
String[][] words = new String[2][];
// Each sub-array is null.
System.out.println(words[0]);
// We can create the subarrays 'manually'.
words[0] = new String[3];
// Can set a values in the sub-array we
// just created.
words[0][1] = "hi there";
System.out.println(words[0][1]);
}
}