arrays

package prep_1_arrays;

import java.util.Collection;

public class Basic {
	// declaring arrays
	int intArray1[]; // arrays can be made both ways
	int[] intArray2;

	byte byteArray[];
	short shortsArray[];
	boolean booleanArray[];
	long longArray[]; // only basic data types
	float floatArray[];
	double doubleArray[];
	char charArray[];

	// 2D array
	int[][] int2Array = new int[10][20];

	// 3D array
	int[][][] int3Array = new int[10][20][10];

	Object[] ao; // array of objects

	@SuppressWarnings("rawtypes")
	Collection[] ca;

	// declaring array AND allocating memory to arrays
	int[] intArray3 = new int[20];

	// or
	int[] intArray4 = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	{
		// accessing the elements of the specified array
		for (int i = 0; i < intArray4.length; i++) {
			System.out.println("Element at index " + i + " : " + intArray4[i]);
		}
	}

	public static void main(String[] args) {
		// declares an Array of integers.
		int[] arr;

		// allocating memory for 5 integers.
		arr = new int[5];

		// initialize the first elements of the array
		arr[0] = 10;

		// initialize the second elements 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]);
		}
	}
}