Java Fundamentals · Operators, Strings & Input · Lesson 8 of 22
Working with Strings
Concept
Working with Strings
Strings can be joined with the plus operator, and methods like .substring(), .indexOf(), and .replace() let you inspect and transform text.
By the end of this lesson
- Explain the core idea behind Working with Strings.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
ExampleRunnable
String first = "Rivo";
String last = "Code";
String full = first + last;
System.out.println(full.toLowerCase());Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Working with Strings. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Combine your first and last name into one string and print it in uppercase.
Loading editor…
Console