Java Switch Statement
The Java switch statement is a multi-branch control structure that lets
you execute one block of code among many based on the value of an
expression. It’s often cleaner and more readable than long chains of
if–else statements—especially when comparing a single variable against
multiple constant values.
What Is a Switch Statement in Java?
A switch evaluates an expression once and matches its result against
predefined case values. When a match is found, the corresponding code
block runs.
Syntax
switch (expression) {
case value1:
// code block
break;
case value2:
// code block
break;
default:
// code block
}
How Java Switch Works
- The expression is evaluated.
- Java compares the result with each case.
- When a match occurs, that block executes.
- break stops further execution.
- default runs if no case matches.
Example 1: Grade Evaluation Program
This program converts a numeric score into a letter grade using a
switch statement.
public class GradeSwitchExample {
public static void main(String[] args) {
int score = 82;
char gradeCategory;
if (score >= 90) {
gradeCategory =
'A';
} else if (score >= 75) {
gradeCategory =
'B';
} else if (score >= 60) {
gradeCategory =
'C';
} else {
gradeCategory =
'F';
}
switch (gradeCategory) {
case 'A':
System.out.println("Excellent performance");
break;
case 'B':
System.out.println("Good job");
break;
case 'C':
System.out.println("Satisfactory");
break;
case 'F':
System.out.println("Needs improvement");
break;
default:
System.out.println("Invalid grade");
}
}
}
Output:
Good job
The break Keyword in Switch
The break statement terminates the switch after a matching case
executes. Without break, Java continues executing the next cases—this is called
fall-through.
Example 2: Demonstrating Fall-Through
public class SwitchFallThroughDemo {
public static void main(String[] args) {
int level = 2;
switch (level) {
case 1:
System.out.println("Beginner");
case 2:
System.out.println("Intermediate");
case 3:
System.out.println("Advanced");
default:
System.out.println("Level selection complete");
}
}
}
Output:
Intermediate
Advanced
Level selection complete
Because no break statements are used, execution continues after the
matched case.
The default Case in Java Switch
The default block runs when none of the case values match the
expression.
Example 3: Menu Selection System
public class MenuSwitchExample {
public static void main(String[] args) {
int menuChoice = 5;
switch (menuChoice) {
case 1:
System.out.println("Opening Dashboard");
break;
case 2:
System.out.println("Loading Profile");
break;
case 3:
System.out.println("Showing Settings");
break;
case 4:
System.out.println("Logging out");
break;
default:
System.out.println("Invalid option selected");
}
}
}
Output:
Invalid option selected
When to Use Switch Instead of If–Else
Use a switch when:
- You compare one variable against many constant values
- Conditions are equality-based (==)
- You want cleaner, structured branching
- Performance matters in large decision sets
Use if–else when:
- Conditions involve ranges (>, <, <=)
- Multiple variables are involved
- Logical operators (&&, ||) are needed
Modern Java Switch (Java 14+)
Newer Java versions support a concise switch
expression:
public class ModernSwitchExample {
public static void main(String[] args) {
int day = 3;
String type = switch (day)
{
case 1, 7 ->
"Weekend";
case 2, 3, 4, 5, 6 ->
"Weekday";
default ->
"Invalid";
};
System.out.println(type);
}
}
