Primitive to object conversion in Java - Mini Project: Build & Apply

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Primitive to Object Conversion in Java

📖 Scenario: Imagine you are working on a Java program that needs to convert simple number values into objects so they can be used in collections or methods that require objects.

🎯 Goal: You will create a Java program that converts primitive int values into their corresponding Integer objects using wrapper classes.

📋 What You'll Learn

Create an int variable with a specific value

Create an Integer object from the int variable

Use the Integer.valueOf() method for conversion

Print the Integer object to show the conversion result

💡 Why This Matters

🌍 Real World

Converting primitives to objects is useful when working with Java collections like <code>ArrayList</code> that only accept objects, not primitives.

💼 Career

Understanding wrapper classes and primitive to object conversion is essential for Java developers to handle data correctly and use Java APIs effectively.

1

Create a primitive int variable

Create a primitive int variable called number and set it to 25.

Java

// Your code here

💡 Need a hint?

Use the syntax int variableName = value; to create a primitive integer.

2

Create an Integer object from the int variable

Create an Integer object called numberObject by converting the primitive int variable number using Integer.valueOf(number).

Java

int number = 25;
// Your code here

💡 Need a hint?

Use Integer.valueOf() to convert a primitive int to an Integer object.

3

Print the Integer object

Use System.out.println() to print the numberObject to the console.

Java

int number = 25;
Integer numberObject = Integer.valueOf(number);
// Your code here

💡 Need a hint?

Use System.out.println(variableName); to display the value of a variable.

4

Complete program with main method

Wrap the existing code inside a public class Main with a public static void main(String[] args) method so it can run as a complete Java program.

Java

// Your code here

💡 Need a hint?

Remember that Java programs need a main method inside a class to run.