Case labels
Description
Each case matches one possible value.
Explanation
break prevents the next case from running unintentionally.
Example
case 'A': System.out.println("Excellent"); break;← Chapter 4 — Decision Making & Loops
17. switch Statements
mixed
Description
A switch chooses a branch based on one expression. It is often clearer than a long chain of equality checks for menu options, grades, or known categories.
Modern Java also supports switch expressions, but the classic switch statement is a useful foundation. Include default to handle unexpected values.
Subtopics
Default branch
Description
default handles unmatched input.
Explanation
It keeps a program predictable when data is invalid.
Example
default: System.out.println("Unknown grade");Explanation
Classic switch statements can fall through to the next case when break is omitted. Fall-through is sometimes intentional, but state that purpose clearly.
Example
public class SwitchDemo {
public static void main(String[] args) {
char grade = 'B';
switch (grade) {
case 'A': System.out.println("Excellent"); break;
case 'B': System.out.println("Good work"); break;
default: System.out.println("Keep learning");
}
}
}Key points
- switch compares one expression.
- break prevents accidental fall-through.
- default handles other values.