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Java Collection, ArrayList Exercises: Empty an array list

Java Collection, ArrayList Exercises: Exercise-17 with Solution

Write a Java program to empty an array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Empty an array list

Sample Solution:-

Java Code:

import java.util.ArrayList;
import java.util.Collections;
  public class Exercise17 {
  public static void main(String[] args) {
          ArrayList<String> c1= new ArrayList<String>();
          c1.add("Red");
          c1.add("Green");
          c1.add("Black");
          c1.add("White");
          c1.add("Pink");
          System.out.println("Original array list: " + c1);
          c1.removeAll(c1);
          System.out.println("Array list after remove all elements "+c1);   
   }
}

Sample Output:

Original array list: [Red, Green, Black, White, Pink]                  
Array list after remove all elements []

Flowchart:

Flowchart: Empty an array list.

Java Code Editor:

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Previous: Clone an array list to another array list.
Next: Test an array list is empty or not.

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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