Logic & Computation Array Lecture 1
import java.util.Random;
public class arrayslesson {
public static void main(String[] args)
{
// Out of bounds!!!
// declares an Array of integers.
int[] arr;
// allocating memory for 5 integers.
arr = new int[5];
// initialize the first element of the array
arr[0] = 10;
// initialize the second element of the array
arr[1] = 20;
// so on...
arr[2] = 30;
arr[3] = 40;
arr[4] = 50;
// accessing the elements of the specified array
for (int i = 0; i < arr.length; i++)
{
System.out.println("Element at index " + i + " : " + arr[i]);
}
System.out.print("\n \n \n"); //Just adding some linespaces for structure
//You can also initialize an array in one entire line:
int[] coolerArr = {10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0};
for (int i = 0; i < coolerArr.length; i++)
{
System.out.println("Element at index " + i + " : " + coolerArr[i]);
}
System.out.print("\n \n \n"); //Just adding some linespaces for structure
int[] bigArr = new int[1000];
Random rand = new Random();
for(int i = 0; i < bigArr.length; i++)
{
int randomNum = rand.nextInt(1001);
bigArr[i] = randomNum;
}
for(int i = 0; i < bigArr.length; i++)
{
System.out.print(bigArr[i] + " ");
}
String word = "hotdog";
char[] whyIsJavaLikeThis = word.toCharArray();
for(int i = 0; i < word.length(); i++)
{
whyIsJavaLikeThis[i] = word.charAt(word.length() - (i + 1));
}
word = String.valueOf(whyIsJavaLikeThis);
System.out.println(word);
// Out of bounds!!!
}
}
