We have seen both ‘if …else’ and ‘else…if’, now let’s take a glance at the switch operator:
1: public class NewClass {
2: public static void main (String arg [])
3: {
4: char nation;
5: System.out.println("I for India");
6: System.out.println("E for England");
7: System.out.println("U for United States");
8: System.out.print("Enter Choice:" );
9: System.out.flush();
10: try
11: {
12: switch (nation= (char)System.in.read())
13: {
14: case 'I':
15: System.out.println("It is in Asia");
16: break;
17: case 'E':
18: System.out.println("It is in Europe");
19: break;
20: case 'U':
21: System.out.println("It is in N America");
22: break;
23:
24:
25:
26:
27: }
28:
29:
30: }
31: catch (Exception e)
32: {System.out.println("I/O Error!");
33:
34: }
35:
36:
37: }
38: }
Here are few points you need to note:
1. There is no semi colon after catch
2. Catch is required to match with try
3. After the case we use a colon.
4. The input should be quotes (each case)
5. System.in.read() is used to read the input
6. Break is used for separating each case.
Note: You are using flush to send the data to the buffer. You can also write the code without this, since System.out can perform low level works.
run: I for India E for England U for United States Enter Choice:I It is in Asia
You can employ the ‘?:’ operator as well for decision making.
+44-07928280977
post@aasisvinayak.com
aasisvinayak
Join Techblog
Facebook Group
Follow techblog on Twitter
Read
Digg entries 
Add techblog to
Google reader