Switch case in Java

Java Switch Statement

The Java switch statement is executes one statement from multiple conditions. It is like if-else-if ladder statement.

A switch statement allows a variable to be tested for equality against a list of values.

 

Syntax:

1. switch(expression){    
2. case value1:    
3.  //code to be executed;    
4.  break;  //optional  
5. case value2:    
6.  //code to be executed;    
7.  break;  //optional  
8. ......    
9.     
10. default:     
11.  code to be executed if all cases are not matched;    
12. }    

Example:

1. public class SwitchExample {  
2. public static void main(String[] args) {  
3.     int number=20;  
4.     switch(number){  
5.     case 10: System.out.println("10");break;  
6.     case 20: System.out.println("20");break;  
7.     case 30: System.out.println("30");break;  
8.     default:System.out.println("Not in 10, 20 or 30");  
9.     }  
10. }  
11. }  

Output:

20

Java Switch Statement if fall-through

The java switch statement is fall-through. It means it executes all statement after first match if break statement is not used with switch cases.

Example:

1. public class SwitchExample2 {  
2. public static void main(String[] args) {  
3.     int number=20;  
4.     switch(number){  
5.     case 10: System.out.println("10");  
6.     case 20: System.out.println("20");  
7.     case 30: System.out.println("30");  
8.     default:System.out.println("Not in 10, 20 or 30");  
9.     }  
10. }  
11. }  

Output:

20
30
Not in 10, 20 or 30