Java ArrayList get() Method Example

The java.util.ArrayList.get(int index) method returns the element at the specified position in this list.

Java ArrayList get() Method Example

import java.util.ArrayList;
import java.util.List;

// How to check if an ArrayList is empty using the isEmpty() method.
// How to find the size of an ArrayList using the size() method.
// How to access the element at a particular index in an ArrayList using the get() method.
// How to modify the element at a particular index in an ArrayList using the set() method.

public class AccessElementsFromArrayListExample {
    public static void main(String[] args) {
        List<String> topProgrammingLanguages = new ArrayList<>();

        // Check if an ArrayList is empty
        System.out.println("Is the topProgrammingLanguages list empty? : " 
                            + topProgrammingLanguages.isEmpty());

        topProgrammingLanguages.add("C");
        topProgrammingLanguages.add("Java");
        topProgrammingLanguages.add("C++");
        topProgrammingLanguages.add("Python");
        topProgrammingLanguages.add(".net");

        // Find the size of an ArrayList
        System.out.println("Here are the top " + topProgrammingLanguages.size() 
                          + " Programming Languages in the world");
        System.out.println(topProgrammingLanguages);

        // Retrieve the element at a given index
        String bestProgrammingLang = topProgrammingLanguages.get(1);
        String secondBestProgrammingLang = topProgrammingLanguages.get(1);
        String dotNetProgrammingLang = topProgrammingLanguages
          .get(topProgrammingLanguages.size() - 1);

        System.out.println("best Programming Lang: " + bestProgrammingLang);
        System.out.println("Second Best Programming Lang: " + secondBestProgrammingLang);
        System.out.println("Dot Net Programming Lang: " + dotNetProgrammingLang);

        // Modify the element at a given index
        topProgrammingLanguages.set(4, "C#");
        System.out.println("Modified top Programming Languages list: " + topProgrammingLanguages);
    }
}
Output:
Is the topProgrammingLanguages list empty? : true
Here are the top 5 Programming Languages in the world
[C, Java, C++, Python, .net]
best Programming Lang: Java
Second Best Programming Lang: Java
Dot Net Programming Lang: .net
Modified top Programming Languages list: [C, Java, C++, Python, C#]

Reference


Java ArrayList Source Code Examples


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