indexOf method return -1 if object is not present in the ArrayList ArrayList indexOf Example: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 import java.util.ArrayList; import java.util.HashSet; import java.util.LinkedHashSet; import java.util.*;...
Java ArrayList class is non synchronized. Example of Java ArrayList class package programs; import java.util.ArrayList; import java.util.Iterator; public class CollectionArrayList { public static void main(String[] args) { ArrayList <String> alist = new ArrayList <String> (); // creating array...
Java Program to Reverse an ArrayList in Java Here is my code example of reversing an ArrayList of Integer. You can see that we have added numbers on increasing order but after calling reverse() method, it prints them on decreasing order. Unlike popular misconception, Comparable or Comparator is...
You can use theset()method ofjava.util.ArrayListclass to replace an existing element of ArrayList in Java. The set(int index, E element) method takes two parameters, the first is the index of an element you want to replace, and the second is the new value you want to insert. You can...
We have already discussed a bit about synchronization when we shared the tutorial on Vector vs ArrayList. As we are aware that ArrayList is non-synchronized and should not be used in multi-thread environment without explicit synchronization. This post is
Iterator<String> iterator = arrayList.iterator(); //Step 4: Iterate Using while loop while (iterator.hasNext()) { System.out.println(iterator.next()); } } } Output: Iterate Using Iterator I Love JAVA Description: In Step 1, we have created an object of List Interface that is of String...
Java program to create adeep copy of an arraylist. ArrayList<Employee>employeeList=newArrayList<>();employeeList.add(newEmployee(1l,"adam",newDate(1982,02,12)));ArrayList<Employee>employeeListClone=newArrayList<>();Collections.copy(employeeList,employeeListClone);//Modify the list item in cloned...
import java.util.*; public class ListExample { public static void main(String[] args) { //creating a list of integers List < String > str_list = new ArrayList < String > (); int n; Scanner in = new Scanner(System.in); System.out.print("Enter total number of strings: "); n =...
class).defaultFields()); if (allowedFields.isEmpty()) { allowedFields = new ArrayList<>(); for (final Method m : clazz.getDeclaredMethods()) { final String methodName = m.getName(); if (methodName.startsWith("get") || methodName.startsWith("has")) { final char[] c = method...
public static Map<QName, Serializable> getAlfrescoProperty(final AlfrescoORM alfrescoORM) throws IllegalArgumentException, IllegalAccessException, SecurityException, NoSuchMethodException, InvocationTargetException, InstantiationException { List<Field> fields = new ArrayList<Field>(); ReflectionUtil.getFields(alf...