Creating a new String with the Case Changed

We've compiled some helpful String methods below.

Methods that are part of the AP Computer Science A Java subset are denoted by the APCSA label.

A complete list of String methods can be found in the String API.

String toLowerCase() & String toUpperCase()

String toLowerCase()

This method creates a new String where all uppercase letters of this String have been converted to lowercase letters.

String toUpperCase()

Similar to the method toLowerCase, but the method creates a new String where all lowercase letters of this String have been converted to uppercase letters.

Your Turn

Let's try it in the Java Playground.

• Predict the values of lower and upper.
• Run the code to determine whether your prediction is correct.

• lower has been assigned the value duke loves java.
• upper has been assigned the value DUKE LOVES JAVA.

Complete List of String Learn Tutorials

• Learn: Declaring Strings
• Learn: Constructing a String
• Learn: String Indexing
• Learn: Comparing Strings with compareTo methods
• Learn: Comparing Strings with equals methods
• Learn: Creating Substrings
• Learn: Creaing a new String with the Case Changed

Resources

• Learn: Declaring Strings
• Learn: Introduction to Arithmetic Expressions
• Learn: Introduction to Console Input and Output
• Learn: Formatting Output with Escape Sequences and Text Blocks
• Practice: Evaluating Expressions that Use String Methods
• Practice: Write Code that Uses the String Methods
• Practice: AP Computer Science A String Free Response Questions

Next Learn Tutorial

• Learn: Using Wrapper Classes