FAQ: Learn Java: Arrays - Length

This community-built FAQ covers the “Length” exercise from the lesson “Learn Java: Arrays”.

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This exercise can be found in the following Codecademy content:

Learn Java

FAQs on the exercise Length

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import java.util.Arrays;

public class Newsfeed {
  
  String[] topics = {"Opinion", "Tech", "Science", "Health"};
  int[] views = {0, 0, 0, 0};
  
  public Newsfeed(){

  }
    
  public String[] getTopics(){
    return topics;
  }
  
  public int getNumTopics(){
    return topics.length;
    
  }
  
  public static void main(String[] args){
    Newsfeed sampleFeed = new Newsfeed();
    
    System.out.println("The number of topics is "+ sampleFeed.getNumTopics());
   
  }
}

my solution for exercise 6/8

What is the different between length in a String class and length in Array Class

How come when I write “System.out.println(topics.length);” I get an error?

The lesson said to to return the length.

None, String, at its core, is an array of char type variable.

Is there a way to ignore the empty slots of the array?

  public int getNumTopics(){
    return topics.length;
  }