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Java Collection, ArrayList Exercises: Create a new array list, add some elements and print out the collection

Java Collection, ArrayList Exercises: Exercise-1 with Solution

Write a Java program to create a new array list, add some elements (string) and print out the collection.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Create a new array list, add some elements and print out the collection

Sample Solution:-

Java Code:

import java.util.*;
public class Exercise1 {
  public static void main(String[] args) {
  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");
  System.out.println(list_Strings);
 }
}

Sample Output:

Note: Exercise1.java uses unchecked or unsafe operations.              
Note: Recompile with -Xlint:unchecked for details.                     
[Red, Green, Orange, White, Black]

Flowchart:

Flowchart: Create a new array list, add some elements  and print out the collection.

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()));
}

Ref: https://bit.ly/3xXcFZt