Java: Insert an element into the array list at the first position
Java Collection, ArrayList Exercises: Exercise-3 with Solution
Write a Java program to insert an element into the array list at the first position.
Pictorial Presentation:

Sample Solution:-
Java Code:
import java.util.*;
public class Exercise3 {
public static void main(String[] args) {
// Creae a list and add some colors to the list
List<String> list_Strings = new ArrayList<String>();
list_Strings.add("Red");
list_Strings.add("Green");
list_Strings.add("Orange");
list_Strings.add("White");
list_Strings.add("Black");
// Print the list
System.out.println(list_Strings);
// Now insert a color at the first and last position of the list
list_Strings.add(0, "Pink");
list_Strings.add(5, "Yellow");
// Print the list
System.out.println(list_Strings);
}
}
Sample Output:
Note: Exercise3.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. [Red, Green, Orange, White, Black] [Pink, Red, Green, Orange, White, Yellow, Black]
Flowchart:

Java Code Editor:
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Java: Tips of the Day
How to convert an iterator to a stream?
One way is to create a Spliterator from the Iterator and use that as a basis for your stream:
Iterator<String> sourceIterator = Arrays.asList("A", "B", "C").iterator(); Stream<String> targetStream = StreamSupport.stream( Spliterators.spliteratorUnknownSize(sourceIterator, Spliterator.ORDERED), false);
An alternative which is maybe more readable is to use an Iterable - and creating an Iterable from an Iterator is very easy with lambdas because Iterable is a functional interface:
Iterator<String> sourceIterator = Arrays.asList("A", "B", "C").iterator(); Iterable<String> iterable = () -> sourceIterator; Stream<String> targetStream = StreamSupport.stream(iterable.spliterator(), false);
Ref: https://bit.ly/2NQ4lc8
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