Using toLowerCase() and toUpperCase() in Java
By: Mashoud in Java Tutorials on 2007-09-02
The method toLowerCase() converts all the characters in a string from uppercase to lowercase. The toUpperCase() method converts all the characters in a string from lowercase to uppercase. Nonalphabetical characters, such as digits, are unaffected. Here are the general forms of these methods:
String toLowerCase()
String toUpperCase()
Both methods return a String object that contains the uppercase or lowercase equivalent of the invoking String.
Here is an example that uses toLowerCase() and toUpperCase():
// Demonstrate toUpperCase() and toLowerCase().
class ChangeCase {
public static void main(String args[]) {
String s = "This is a test.";
System.out.println("Original: " + s);
String upper = s.toUpperCase();
String lower = s.toLowerCase();
System.out.println("Uppercase: " + upper);
System.out.println("Lowercase: " + lower);
}
}
The output produced by the program is shown here:
Original: This is a test.
Uppercase: THIS IS A TEST.
Lowercase: this is a test.
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