ArraysConcept.java

package com.CoreJava;

import java.util.Arrays;

public class ArraysConcept {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		// limitations of array:
				// 1.size is fixed

				// 1. with new keyword:
				int a[] = new int[4];
				a[0] = 10;
				a[1] = 20;
				a[2] = 30;
				a[3] = 40;

				System.out.println(a[0]);
				System.out.println(a[3]);
				// System.out.println(a[4]);//ArrayIndexOutOfBoundsException
				// System.out.println(a[-1]);//ArrayIndexOutOfBoundsException

				int len = a.length;// 4
				System.out.println(len);
				int hi = len - 1;
				System.out.println(hi);
				int li = 0;
				System.out.println(li);

				System.out.println("--------");
				// to print all the values from the array: use for loop:
				for (int i = 0; i < len; i++) {
					System.out.println(a[i]);// 10 20 30 40
				}

				// without using for loop:
				System.out.println(a);// [I@c2e1f26
				System.out.println(Arrays.toString(a));

				// double array:
				double d[] = new double[2];// 0 to 1
				d[0] = 12.33;
				d[1] = 34.44;
				System.out.println(d[0] + d[1]);

				// String array:
				String emp[] = new String[3]; // 0-2
				emp[0] = "Pooja";
				emp[1] = "Ravi";
				emp[2] = "Robin";

				System.out.println("total emp: " + emp.length);
				System.out.println(Arrays.toString(emp));

				for (int k = 0; k < emp.length; k++) {
					System.out.println(emp[k]);
					if (emp[k].equals("Ravi")) {
						System.out.println("ravi salary is : " + 1000);
						break;
					}
				}

			}
			
			//static array ex:
			//month/days
			//200 
			//250 
			//
}