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ArrayListConcept.java
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137 lines (97 loc) · 2.74 KB
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package JavaSessions;
import java.util.ArrayList;
public class ArrayListConcept {
public static void main(String[] args) {
// ArrayList -- Default class
// dynamic array
// size is not fixed
// index based -- maintains the order
// create the object of the ArrayList class
ArrayList ar = new ArrayList();
System.out.println(ar.size());// pc = 0
ar.add(100);// 0
ar.add(200);// 1
ar.add(300);// 2
System.out.println(ar.size());// 3
ar.add(400);// 3
ar.add(500);// 4
System.out.println(ar.size());// 5
ar.add(400);// 5
ar.add(500);// 6
System.out.println(ar.size());// 7
ar.remove(3);
System.out.println(ar.get(3));
System.out.println(ar.size());// 6
// to print all the values from arraylist: for loop: O(n)
for (int i = 0; i < ar.size(); i++) {
System.out.println(ar.get(i));
}
ar.add("testing");
ar.add(12.33);
ar.add(true);
ar.add('F');
for (Object e : ar) {
System.out.println(e);
}
// Generics in Java
// AR -- names (String)
ArrayList<String> empList = new ArrayList<String>();
empList.add("Tanu");
empList.add("Tom");
for (String e : empList) {
System.out.println(e);
}
ArrayList<Integer> empNumber = new ArrayList<Integer>();
empNumber.add(100);
empNumber.add(200);
for (Integer e : empNumber) {
System.out.println(e);
}
// AR -- emp data --> String, int, double, true, char
ArrayList<Object> empData = new ArrayList<Object>(5);
empData.add("Lisa");
empData.add(30);
empData.add(34.55);
empData.add(true);
empData.add('F');
for (Object e : empData) {
System.out.println(e);
}
System.out.println(empData);
for (int i = 0; i < empData.size(); i++) {
System.out.println(empData.get(i));
if (empData.get(i).equals("Lisa")) {
System.out.println("emp name is lisa");
break;
}
}
// use cases in selenium:
// 10 links on the page
// collect all 10 links in an arraylist
// start a loop:
// if(ele.text().equals('amazon')
// click()
// break;
// drop down selection:
// 20 elements/options are there
// collect all 20 values in arraylist
// start a loop:
// if(ele.text().equals('India')
// select the value
// break;
ArrayList<String> namesList = new ArrayList<String>();
namesList.add("Tom");
namesList.add("Lisa");
namesList.add("Pter");
namesList.add(namesList.size(),"naveen");//last position
namesList.add(namesList.size()-namesList.size(),"Robby");//first position
System.out.println(namesList);
//
ArrayList<String> product = new ArrayList<String>();
product.add("Macbook");//0
product.add("Samsung");//1
System.out.println(product.get(0));
System.out.println(product.get(1));
//System.out.println(product.get(2));//IndexOutOfBoundsException
}
}