String immutability in Java - Mini Project: Build & Apply

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Understanding String Immutability in Java

📖 Scenario: Imagine you are working on a simple Java program that handles user names. You want to understand how strings behave when you try to change them.

🎯 Goal: You will create a string, try to change it, and observe how Java handles string immutability.

📋 What You'll Learn

Create a string variable with a specific value

Create a second string variable by modifying the first string

Compare the original and modified strings

Print the results to observe immutability

💡 Why This Matters

🌍 Real World

Understanding string immutability helps avoid bugs when working with text data in applications like user input processing or file handling.

💼 Career

Many programming jobs require knowledge of how strings behave to write efficient and correct code, especially in Java backend development.

1

Create the original string

Create a string variable called originalName and set it to the value "Alice".

Java

// Create a string variable called originalName and set it to "Alice"
// Your code here

💡 Need a hint?

Use String originalName = "Alice"; to create the string.

2

Create a modified string

Create a string variable called modifiedName by adding the text " Smith" to originalName using the + operator.

Java

String originalName = "Alice";
// Create a string variable called modifiedName by adding " Smith" to originalName
// Your code here

💡 Need a hint?

Use String modifiedName = originalName + " Smith"; to create the new string.

3

Compare the original and modified strings

Create a boolean variable called isSame that checks if originalName and modifiedName are the same using the equals() method.

Java

String originalName = "Alice";
String modifiedName = originalName + " Smith";
// Create a boolean variable isSame to check if originalName equals modifiedName
// Your code here

💡 Need a hint?

Use boolean isSame = originalName.equals(modifiedName); to compare the strings.

4

Print the results

Print the values of originalName, modifiedName, and isSame using System.out.println().

Java

String originalName = "Alice";
String modifiedName = originalName + " Smith";
boolean isSame = originalName.equals(modifiedName);
// Print originalName, modifiedName, and isSame
// Your code here

💡 Need a hint?

Use System.out.println() to print each variable on its own line.