when to use Colon's?

Answer 1

colons r most use in switch cases like case 1: and semicolon is used to end a statement and in case of c++ colons r also used in inheritance

Answer 2

This link will help you

http://stackoverflow.com/questions/2399590/java-what-does-the-colon-operator-do

Answer 3

semi colon is used to end the statement

Answer 4

semi colons are used when your line of code is done. understand?