w3resource

Java Collection, ArrayList Exercises: Trim the capacity of an array list the current list size

Java Collection, ArrayList Exercises: Exercise-19 with Solution

Write a Java program to trim the capacity of an array list the current list size.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Trim the capacity of an array list the current list size

Sample Solution:-

Java Code:

import java.util.ArrayList;
import java.util.Collections;
  public class Exercise19 {
  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);
          System.out.println("Let trim to size the above array: ");
          c1.trimToSize();
          System.out.println(c1);
   }
}

Sample Output:

Original array list: [Red, Green, Black, White, Pink]                  
Let trim to size the above array:                                      
[Red, Green, Black, White, Pink] 

Flowchart:

Flowchart: Trim the capacity of an array list the current list size.

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Test an array list is empty or not.
Next: Increase the size of an array list.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

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