Create and assign simple strings of characters - Example 4

Snippet: Create, Assign and Concatenate Simple Strings of Characters

Explanation

This snippet shows how to concatenate a string and reassign the result to the same variable. The variable message starts with the value "Hello". Then, message + " World" creates a new string "Hello World", and the result is assigned back to message.

After the reassignment, message holds "Hello World". The original "Hello" string is not modified — strings in Java are immutable. The variable simply now points to a new string value.

What You Can Do

Try concatenating more words — can you build a full sentence step by step, reassigning message each time?

You can also try using the += shorthand: message += " World" does exactly the same thing as message = message + " World". Does the output change?

Run it and observe the output!

Example List

• AP CSA String Examples

Additional Resources

• Learn: Declaring Strings
• Learn: Constructing a String
• Learn: Introduction to String Indexing
• Learn: Comparing Two String Objects Using compareTo Methods
• Learn: Comparing String Objects with equals Methods
• Learn: Obtaining Substrings from a String Object
• Learn: Using the split method on a String
• Practice: Evaluating Expressions that use the String Class
• Practice: Writing Code Using the String Class
• FRQ Practice: AP Computer Science A FRQ 1 Formatting Words
• FRQ Practice: AP Computer Science A FRQ 1 Sentence Analysis