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Java Collection, ArrayList Exercises: Iterate through all elements in a array list

Java Collection, ArrayList Exercises: Exercise-2 with Solution

Write a Java program to iterate through all elements in a array list.

Pictorial Presentation:

Java Collection, ArrayList Exercises: Iterate through all elements in a list

Sample Solution:-

Java Code:

import java.util.*;
  public class Exercise2 {
  public static void main(String[] args) {
  // Creae a list and add some colors to the list
  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");
  // Print the list
  for (String element : list_Strings) {
    System.out.println(element);
    }
 }
}

Sample Output:

Red                                                                    
Green                                                                  
Orange                                                                 
White                                                                  
Black

Flowchart:

Flowchart: Iterate through all elements in a list.

Java Code Editor:

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Previous: Create a new array list, add some elements and print out the collection.
Next: Insert an element into the array list at the first position.

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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