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Java Array Exercises: Convert an ArrayList to an array

Java Array: Exercise-21 with Solution

Write a Java program to convert an ArrayList to an array.

Pictorial Presentation:

Java Array Exercises: Convert an ArrayList to an array

Sample Solution:

Java Code :

import java.util.ArrayList;
  import java.util.Arrays;
  public class Exercise21 {
  public static void  main(String[] args)
  {
  ArrayList<String> list = new ArrayList<String>();

  list.add("Python");
 
  list.add("Java");
 
  list.add("PHP");
  
  list.add("C#");
 
  list.add("C++");
  
  list.add("Perl");
 
  String[]  my_array = new String[list.size()];
  
  list.toArray(my_array);
  
  for (String  string : my_array)
  {
  System.out.println(string);
  }
  }
  }

Sample Output:

Python                                                                                                
Java                                                                                                
PHP                                                                                                
C#                                                                                                
C++                                                                                                
Perl 

Flowchart:

Flowchart: Java exercises: Convert an ArrayList to an array

Visualize Java code execution (Python Tutor):


Java Code Editor:

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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