Java Collection, ArrayList Exercises: Replace the second element of a ArrayList with the specified element
Java Collection, ArrayList Exercises: Exercise-21 with Solution
Write a Java program to replace the second element of a ArrayList with the specified element.
Pictorial Presentation:

Sample Solution:-
Java Code:
import java.util.ArrayList;
public class Exercise21 {
public static void main(String[] args){
ArrayList<String> color = new ArrayList<String>();
color.add("Red");
color.add("Green");
System.out.println("Original array list: " + color);
String new_color = "White";
color.set(1,new_color);
int num=color.size();
System.out.println("Replace second element with 'White'.");
for(int i=0;i<num;i++)
System.out.println(color.get(i));
}
}
Sample Output:
Original array list: [Red, Green] Replace second element with 'White'. Red White
Flowchart:

Java Code Editor:
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Java: Tips of the Day
getEnumMap
Converts to enum to Map where key is the name and value is Enum itself.
public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) { return Arrays.stream(enumClass.getEnumConstants()) .collect(Collectors.toMap(Enum::name, Function.identity())); }
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