Using a string to control a switch

• Before JDK 7, the switch could only be controlled by integer types such as int or char.

• This limited the use of switch when the action selection was based on the contents of a String.

• In these cases, it was common to use an if-else-if ladder.

• With JDK 7, it became possible to use String to control switches, making the code more readable and optimized in various situations.

• Example:

• Exit:
  Canceling

• The switch checks the value of command against the case constants, executing the code corresponding to the first match found.

• Using switch with String can improve code readability and is more convenient than a sequence of if/else.

• However, using switch with String may be less efficient than using integers.

• It is recommended to use switch with String only when the control data is already in that form, avoiding unnecessary use.