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Java Collection, ArrayList Exercises: Increase the size of an array list

Java Collection, ArrayList Exercises: Exercise-20 with Solution

Write a Java program to increase the size of an array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Increase the size of an array list

Sample Solution:-

Java Code:

import java.util.ArrayList;
import java.util.Collections;
  public class Exercise20 {
  public static void main(String[] args) {
          ArrayList<String> c1= new ArrayList<String>(3);
          c1.add("Red");
          c1.add("Green");
          c1.add("Black");
          System.out.println("Original array list: " + c1);
          //Increase capacity to 6
          c1.ensureCapacity(6);
          c1.add("White");
          c1.add("Pink");
          c1.add("Yellow");
          System.out.println("New array list: " + c1);
   }
}

Sample Output:

Original array list: [Red, Green, Black]                               
New array list: [Red, Green, Black, White, Pink, Yellow]

Flowchart:

Flowchart: Increase the size of an array list.

Java Code Editor:

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Previous: Trim the capacity of an array list the current list size.
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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

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