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Get Synchronized List from ArrayList in java
In order to get a synchronized list from an ArrayList, we use the synchronizedList(List <T>) method in Java. The Collections.synchronizedList(List <T>) method accepts the ArrayList as an argument and returns a thread safe list.
Declaration −The Collections.synchronizedList(List <T>) method is declared as follows −
public static List <T> synchronizedList(List <T> list)
Let us see a program to get a synchronized List from ArrayList −
Example
import java.util.*;
public class Example {
public static void main (String[] args) {
List<String> list = new ArrayList<String>();
list.add("Hello");
list.add("Hi");
list.add("World");
list = Collections.synchronizedList(list);
synchronized(list) {
Iterator itr = list.iterator();
while (itr.hasNext())
System.out.print(itr.next()+" ");
}
}
}
Output
Hello Hi World
Collections.synchronizedList() method
The synchronizedList() method is used to synchronize the collections in Java.
Syntax
public static List<T> synchronizedList(List<T> list)
Example
import java.util.*;
public class SynchronizedListTest {
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("IND");
list.add("AUS");
list.add("WI");
list.add("NZ");
list.add("ENG");
List<String> synlist = Collections.synchronizedList(list);
synchronized(synlist) {
Iterator<String> itr = synlist.iterator();
while(itr.hasNext()) {
String str = itr.next();
System.out.println(str);
}
}
}
}Output
IND AUS WI NZ ENG
CopyOnWriteArrayList
The CopyOnWriteArrayList will create a list of the elements in the order of specified collection. It is thread-safe concurrent access of ArrayList. When an ArrayList is modified, it will create a fresh copy of the underlying array.
Syntax
public class CopyOnWriteArrayList<E> extends Object implements List<E>, RandomAccess, Cloneable, Serializable
Example
import java.util.*;
import java.util.concurrent.*;
public class CopyOnWriteArrayListTest {
public static void main(String[] args) {
CopyOnWriteArrayList list = new CopyOnWriteArrayList();
list.add("Java");
list.add("Scala");
list.add("Python");
list.add("Selenium");
list.add("ServiceNow");
System.out.println("Displaying synchronized ArrayList: ");
Iterator itr = list.iterator();
while(itr.hasNext()) {
String str = itr.next();
System.out.println(str);
}
}
}Output
Displaying synchronized ArrayList: Java Scala Python Selenium ServiceNow
Updated on: 12-Mar-2024
2K+ Views
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