Share

Search Java Code Snippets


  Help us in improving the repository. Add new snippets through 'Submit Code Snippet ' link.





#Java - Code Snippets for '#Arraylist' - 10 code snippet(s) found

 Sample 1. Usage of Apache Commons - ArrayListValuedHashMap

ListValuedMap<String,String> listValuedMap = new ArrayListValuedHashMap();
listValuedMap.put("United States", "Washington");
listValuedMap.put("Canada", "Ottawa");
listValuedMap.put("Canada", "Ottawa");
listValuedMap.put("South Africa", "Pretoria");
listValuedMap.put("South Africa", "Cape Town");
listValuedMap.put("South Africa", "Bloemfontein");

System.out.println(listValuedMap); // Values being added to the List and allow even duplicates

   Like      Feedback     apache commons  apache commons collections  ArrayListValuedHashMap  ListValuedMap


 Sample 2. ArrayList of Optional Integers

List<Optional<Integer>> intList = new ArrayList<Optional<Integer>>();

// Add Elements

intList.add(Optional.empty());
intList.add(Optional.of(2));
intList.add(Optional.of(3));
intList.add(Optional.of(4));

   Like      Feedback     optional  java 8   list   arraylist   list of optional integers   arraylist of optional  java.util.Optional


 Sample 3. Sorting an arraylist using Collections.sort

List<String> myList = new ArrayList<String>();
myList.add("D");
myList.add("A");
myList.add("B");
myList.add("C");
myList.add("E");

System.out.println(myList); // Unsorted

Collections.sort(myList);

System.out.println(myList); // Sorted

   Like      Feedback     list  arraylist  collections.sort  collections


 Sample 4. Initialize list using google guava Lists

import java.util.List;
import com.google.common.collect.Lists;

class GoogleListsTest{
public static void main(String[] args){
List list = Lists.newArrayList();
}
}

   Like      Feedback     list  google guava  Lists  Lists.newArrayList  com.google.common.collect.Lists


Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner
 Sample 5. Internal Implementation of ArrayList#removeIf

@Override
public boolean removeIf(Predicate<? super E> filter) {
Objects.requireNonNull(filter);

int removeCount = 0;
final BitSet removeSet = new BitSet(size);
final int expectedModCount = modCount;
final int size = this.size;
for (int i=0; modCount == expectedModCount && i < size; i++) {
@SuppressWarnings("unchecked")
final E element = (E) elementData[i];
if (filter.test(element)) {
removeSet.set(i);
removeCount++;
}
}
if (modCount != expectedModCount) {
throw new ConcurrentModificationException();
}

// shift surviving elements left over the spaces left by removed elements
final boolean anyToRemove = removeCount > 0;
if (anyToRemove) {
final int newSize = size - removeCount;
for (int i=0, j=0; (i < size) && (j < newSize); i++, j++) {
i = removeSet.nextClearBit(i);
elementData[j] = elementData[i];
}
for (int k=newSize; k < size; k++) {
elementData[k] = null; // Let gc do its work
}
this.size = newSize;
if (modCount != expectedModCount) {
throw new ConcurrentModificationException();
}
modCount++;
}

return anyToRemove;
}

   Like      Feedback     Internal Implementation of ArrayList#removeIf  java.util.function.Predicate  java.util.Objects  java.util.Objects  java.util.ConcurrentModificationException.ConcurrentModificationException


 Sample 6. Get all Permutations of List Elements using Apache Commons PermutationIterator

List<String> list = new ArrayList();
list.add("Washington");
list.add("Nevada");
list.add("California");

PermutationIterator permIterator = new PermutationIterator((Collection) list);
      
permIterator.forEachRemaining(System.out::print); // prints [Washington, Nevada, California][Washington, California, Nevada][California, Washington, Nevada][California, Nevada, Washington][Nevada, California, Washington][Nevada, Washington, California]

   Like      Feedback     Permutations of collection elements  Permutations of List elements  Apache Commons  PermutationIterator  Iterator  Collections  .forEachRemaining  System.out::print  List  ArrayList


 Sample 7. Looping through elements of an ArrayList

public static void main(String[] args){
      List list = new ArrayList();
      list.add(1);
      list.add(2);
      list.add(3);
      for(Integer element: list){
         System.out.println(element);
      }
   }

   Like      Feedback     arraylist  list  collections


 Sample 8. Display elements of a List using For loop

List myList = new ArrayList();
      
myList.add("A");
myList.add("B");
myList.add("C");

for(String str:myList){ // prints A B C
   System.out.println(str);
}

   Like      Feedback     Print elements of a list   for loop   arraylist  list  collections


 Sample 9. Display elements of a List using For Loop and index

List myList = new ArrayList();
      
myList.add("A");
myList.add("B");
myList.add("C");

for(int index=0;index < myList.size(); index++){
   System.out.println(myList.get(index));
}

   Like      Feedback     Print elements of a list   arraylist  list  collections   for loop


Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner
 Sample 10. Display Elements of a List using Java 8 Consumer

List myList = new ArrayList();
      
myList.add("A");
myList.add("B");
myList.add("C");

myList.forEach(System.out::println);

   Like      Feedback     Print elements of a list   java 8  consumer  foreach   list  arraylist  collections



Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner



comments powered by Disqus